diff --git a/.gitignore b/.gitignore
index 9bcf3dd..a616c33 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,7 @@ CMakeUserPresets.json
 .claude/
 book/book/
 __pycache__/
+
+# ITU real-speech test vectors: local test use only, never committed
+# (download from the ITU test-signal database; see docs/itu-compliance.md)
+tests/data/itu/
diff --git a/HANDOFF.md b/HANDOFF.md
index 21eb1cb..88e1713 100644
--- a/HANDOFF.md
+++ b/HANDOFF.md
@@ -263,13 +263,29 @@ stand-ins marked method-equivalent; (7) P.502 still unobtained —
 analysis methods reconstructed from the P.340/P.111x test descriptions.
 Rec PDFs live in the session scratchpad only (never committed).*
 
-**Stage 1 — Calibrated ITU signal layer** (`tests/support/`). Level
-calibration conventions (dBov/activity-gated levels), a deterministic
-P.501 CSS generator, the P.501 double-talk sequences, per-bandwidth
-band-limiting, driving-noise generator + car-cabin echo paths for the
-P.1100 series (modeled first; Tim's measured cabin RIRs can join via the
-existing fixture pipeline). Pass: generated signals match published
-spectral/temporal properties.
+**Stage 1 — Calibrated ITU signal layer** (`tests/support/`). *DONE —
+`itu_levels.h` (dBov/dBm0/dBPa conventions, prewarped-bilinear
+A-weighting, 35/5 ms integrators, sliding peak, P.56-style active-level
+meter) + `itu_signals.h` (CSS single/double-talk with the P.501
+Table 7-1/7-2 voiced segments transcribed from the PDF, 8192-pt PN
+adaptive-systems variant, shaping + band-limit filters, AM-FM
+orthogonal pair + comb analysis, activation sequence, Hoth + synthetic
+driving noise, moving-reflector time-variant path) +
+`tests/fixtures/rir_cabin.h` (image-source cabin, RT60 66.6 ms) +
+`test_itu_signals.cpp` (12 tests, measured-first). KEY DECISION made in
+stage: the suite runs natively at 44.1 kHz (CSS is sample-exact only
+there; matrix updated). Measured instrument floor worth knowing: the
+AM-FM comb separation is 94.3 dB at the spec's exact band edges — and
+collapses to 19 dB if any guard band is added (recorded in the test).
+Existing fixtures verified bit-reproducible with pyroomacoustics 0.10.1
+before generating the cabin (--only flag added to the generator). Still
+open from this stage: the ITU real-speech attachment WAVs
+(tests/data/itu/, git-ignored) for the three signal-exact rows.
+AMENDED (Tim's directive): 48 kHz and 16 kHz are REQUIRED operating
+rates (44.1 kHz stays the P.501-native reference) — the NOTE 2
+resampler was built (ripple <= 0.014 dB, alias rejection 101 dB), the
+formula generators take fs directly, and make_css_at() emits
+sample-exact periods at every required rate; matrix policy updated.*
 
 **Stage 2 — Residual-echo post-filter + comfort noise.** The big DSP
 item. New header (working name `mutap/postfilter.h`): coherence-based
diff --git a/docs/itu-compliance.md b/docs/itu-compliance.md
index 8e14b37..e16573c 100644
--- a/docs/itu-compliance.md
+++ b/docs/itu-compliance.md
@@ -65,9 +65,25 @@ approach:
   detector-free double-talk adaptation is MuTap's measured strength.
 - **Bandwidth: wideband (P.1110) and SWB/FB (P.1120) are primary**;
   narrowband (P.1100) variants run as band-limited configurations of the
-  same tests. Everything executes at 48 kHz with P.501-specified
-  band-limiting of the receive-direction signals (NB 3.6/4 kHz, WB
-  7.2/8 kHz, SWB 14.4/16 kHz, FB 20 kHz low-pass).
+  same tests, with P.501-specified band-limiting of the receive-direction
+  signals (NB 3.6/4 kHz, WB 7.2/8 kHz, SWB 14.4/16 kHz).
+- **Sample rates (revised twice; current policy per Tim's directive):
+  the compliance suite RUNS AT — and every Tier A/B row must pass at —
+  48 kHz and 16 kHz, with 44.1 kHz kept as the P.501-native reference
+  rate.** Rationale per rate:
+  - **48 kHz (required)**: MuTap's operating rate, the automotive recs'
+    specified analysis rate (8k FFT @ 48 kHz), and the rate at which
+    the RIR fixtures are exact.
+  - **16 kHz (required)**: the wideband telephony rate (AMR-WB/P.1110
+    world). SWB/FB-only clauses are exempt at 16 kHz (they exceed its
+    8 kHz Nyquist); the AM-FM plans (<= 7.04 kHz) fit.
+  - **44.1 kHz (reference)**: P.501's native rate, where the CSS
+    framing is sample-exact without conversion; used to validate the
+    signal layer itself.
+  The bridge is the P.501 NOTE 2 resampler (Stage 1): measured passband
+  ripple <= 0.014 dB (spec < 0.2) and alias rejection 101 dB (spec
+  > 60); the CSS period stays sample-exact at every required rate
+  (15435 / 16800 / 5600 samples per 350 ms at 44.1 / 48 / 16 kHz).
 - **The simulated echo paths**: the three committed image-source rooms
   (fixtures) + a new car-cabin family (small volume ~2.5 m^3, RT ~60 ms
   per G.167 5.2.3.1's car figures) + the P.1110/P.1120 time-variant-path
@@ -238,7 +254,37 @@ implementation budget.
 
 ---
 
-## Simulation assets required (feeds Stage 1)
+## Simulation assets delivered by Stage 1
+
+`tests/support/itu_levels.h` + `tests/support/itu_signals.h` +
+`tests/fixtures/rir_cabin.h`, validated by `tests/test_itu_signals.cpp`
+(measured-first thresholds; the file header carries every number).
+Instrument floors that bound what the compliance suite can measure:
+
+- CSS single/double-talk: sample-exact framing, PN crest 10.97 dB
+  (spec 11 +- 1), bin-flat PN, level calibration exact, voiced segments
+  transcribed from P.501 Tables 7-1/7-2. Available at every required
+  rate via `make_css_at` (PN crest 11.86 dB at 48 kHz / 11.44 at
+  16 kHz; AM-FM separation 94.0 / 92.6 dB at 48 / 16 kHz).
+- AM-FM orthogonal pair: **94.3 dB comb separation** at the spec's exact
+  band edges — the double-talk echo-loss measurement floor sits far
+  beyond the >= 33 dB margin targets. (Analysis discipline recorded in
+  the test: any added guard band collapses the floor.)
+- A-weighting: -19.18 / 0.00 / -1.76 dB at 100 / 1k / 10 kHz
+  (prewarped bilinear; IEC class-1 envelope).
+- NB band-limiter: -85 dB at 4 kHz. Cabin fixture: RT60 66.6 ms.
+- P.56 active-level meter: definitionally consistent on sparse speech
+  (activity 0.312, delta = 10 log10(1/activity) exactly); on CSS the
+  101 ms pause sits inside the 200 ms hangover, so the G.168
+  active-part constants (+1.49 / +1.66 dB) are applied arithmetically.
+
+**ITU real-speech attachments** (P.501 7.3.2/7.3.3/7.3.5): still to be
+procured — download from the ITU test-signal database into
+`tests/data/itu/` (git-ignored; local test use only, never committed).
+Until then the affected rows run on the CSS/AM-FM signals and are
+reported `method-equivalent`.
+
+## Simulation assets required (original Stage 1 list, for reference)
 
 **Signals (all generatable from P.501's algorithmic descriptions):**
 - CSS single-talk, fullband: voiced 48.62 ms (literal sample table 7-1,
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index c00aea4..3134be9 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -37,7 +37,8 @@ add_executable(mutap_tests
     test_adaptation_control.cpp
     test_closed_loop.cpp
     test_rir_fixtures.cpp
-    test_aec.cpp)
+    test_aec.cpp
+    test_itu_signals.cpp)
 target_link_libraries(mutap_tests PRIVATE
     MuTap::MuTap
     mutap_warnings)
diff --git a/tests/fixtures/rir_cabin.h b/tests/fixtures/rir_cabin.h
new file mode 100644
index 0000000..8ddea40
--- /dev/null
+++ b/tests/fixtures/rir_cabin.h
@@ -0,0 +1,1047 @@
+// GENERATED by tools/fixtures/make_rir_fixtures.py — do not edit by hand.
+// SPDX-License-Identifier: MIT
+// Copyright 2026 MuTap contributors
+//
+// Physically-modeled room: car cabin, mic at the mirror, speaker in the footwell.
+// pyroomacoustics image-source method, shoebox [1.9, 1.45, 0.95] m,
+// uniform absorption 0.75, max_order 40,
+// speaker at [0.35, 0.4, 0.25], mic at [1.1, 0.7, 0.85], fs 48000 Hz.
+// Deterministic: rebuilding with the same parameters reproduces
+// this data exactly. Conditioning (delay trim to a 32-sample
+// guard, truncation to 4096 taps, unit-energy normalization)
+// is documented in the generator script.
+#pragma once
+
+namespace mutap_test::fixtures {
+
+    inline constexpr unsigned k_rir_cabin_fs   = 48000;
+    inline constexpr unsigned k_rir_cabin_taps = 4096;
+
+    inline constexpr float k_rir_cabin[4096] = {
+        -2.68981883e-03f, -2.69081751e-03f, -2.69181341e-03f, -2.69280655e-03f,
+        -2.69379691e-03f, -2.69478448e-03f, -2.69576927e-03f, -2.69675125e-03f,
+        -2.69773043e-03f, -2.69870679e-03f, -2.70453297e-03f, -2.68077281e-03f,
+        -2.74740681e-03f, -2.61927913e-03f, -2.83671656e-03f, -2.50836227e-03f,
+        -2.97847363e-03f, -2.34182599e-03f, -3.17909770e-03f, -2.11296935e-03f,
+        -3.44564922e-03f, -1.81428771e-03f, -3.78618372e-03f, -1.43703218e-03f,
+        -4.21031464e-03f, -9.70541293e-04f, -4.73002107e-03f, -4.01151659e-04f,
+        -5.36105133e-03f, 2.88300262e-04f, -6.12018313e-03f, 1.11599588e-03f,
+        -7.03278365e-03f, 2.11747571e-03f, -8.14467159e-03f, 3.35107577e-03f,
+        -9.53058131e-03f, 4.91244992e-03f, -1.13156667e-02f, 6.97016888e-03f,
+        -1.37315975e-02f, 9.85035897e-03f, -1.72522393e-02f, 1.42684737e-02f,
+        -2.30113377e-02f, 2.21392003e-02f, -3.45361319e-02f, 4.08454469e-02f,
+        -7.09668552e-02f, 1.50717148e-01f, 6.70920065e-01f, -1.08518615e-01f,
+        5.48956889e-02f, -4.24187040e-02f, 2.75668201e-02f, -2.73095573e-02f,
+        1.79821552e-02f, -2.07434754e-02f, 1.32735104e-02f, -1.73036663e-02f,
+        1.07730540e-02f, -1.55823587e-02f, 9.76998370e-03f, -1.53636903e-02f,
+        1.05620137e-02f, -1.77841883e-02f, 1.63658685e-02f, -3.44979173e-02f,
+        3.12031877e-01f, 2.76023603e-02f, -1.57715311e-02f, 5.09287534e-03f,
+        -8.21168839e-03f, 1.37532018e-03f, -6.07121713e-03f, 2.80771393e-05f,
+        -5.18270055e-03f, -5.81742326e-04f, -4.76100179e-03f, -8.78987432e-04f,
+        -4.55847686e-03f, -1.01591921e-03f, -4.47818481e-03f, -1.05543019e-03f,
+        -4.47996882e-03f, -1.01996929e-03f, -4.55430620e-03f, -9.14403317e-04f,
+        -4.69565040e-03f, -7.42065291e-04f, -4.91346279e-03f, -4.69884702e-04f,
+        -5.25750324e-03f, -5.19995796e-05f, -5.76603664e-03f, 5.66469852e-04f,
+        -6.55209110e-03f, 1.62692481e-03f, -8.20482020e-03f, 5.30285242e-03f,
+        2.55864031e-01f, -2.53040781e-03f, -5.51744457e-03f, 1.24297961e-03f,
+        -7.85951850e-03f, 3.39374005e-03f, -1.02067559e-02f, 6.21314382e-03f,
+        -1.38631169e-02f, 1.13099223e-02f, -2.16505554e-02f, 2.49240741e-02f,
+        -5.24153822e-02f, 1.91950056e-01f, 1.09946484e-01f, -4.85393316e-02f,
+        2.68686960e-02f, -2.52808813e-02f, 1.56700302e-02f, -1.85616511e-02f,
+        1.07696354e-02f, -1.35788988e-02f, 1.17781975e-03f, 8.46526707e-02f,
+        5.02143219e-02f, -5.29798696e-02f, 1.12427069e-01f, 2.67348794e-02f,
+        1.04930880e-03f, -1.78107555e-02f, 2.27230810e-02f, -4.70210217e-02f,
+        1.18568409e-01f, 1.59336702e-01f, -4.81993174e-02f, 2.17340372e-02f,
+        -1.81777286e-02f, 7.11960822e-03f, -8.78521363e-03f, -1.02282714e-04f,
+        -2.30804120e-03f, -6.93850180e-03f, 6.48193097e-03f, -2.21366766e-02f,
+        6.03794573e-02f, 6.84056848e-02f, -2.43786943e-02f, 7.46539182e-03f,
+        -5.92162082e-03f, -8.42285736e-03f, 2.91342394e-02f, 9.24493817e-02f,
+        -3.11939096e-02f, 1.57759186e-02f, -1.72205389e-02f, 9.23802183e-03f,
+        -1.33243736e-02f, 6.65902430e-03f, -1.15512884e-02f, 5.45231087e-03f,
+        -1.08064372e-02f, 5.13308930e-03f, -1.09508885e-02f, 5.86250142e-03f,
+        -1.25781362e-02f, 9.20919041e-03f, -2.08362839e-02f, 1.00103595e-01f,
+        -7.71474604e-04f, 2.90788283e-02f, 2.37675019e-02f, -1.28558986e-02f,
+        2.76364454e-03f, -5.88591485e-03f, -1.90105290e-03f, -8.87762411e-04f,
+        -1.12448024e-02f, 8.08446708e-02f, 2.19145419e-02f, -1.68630909e-02f,
+        8.40421269e-03f, -1.30977995e-02f, 7.56018796e-03f, -1.47260523e-02f,
+        1.65487963e-02f, 3.37180525e-02f, -9.87716440e-03f, 3.41747370e-02f,
+        1.59197971e-02f, -1.72707724e-02f, 1.24481019e-02f, -2.10437300e-02f,
+        2.14516862e-02f, -4.16782363e-02f, 1.08292480e-01f, 1.10092309e-01f,
+        -3.84993842e-02f, 1.76705272e-02f, -1.67766573e-02f, 7.42389629e-03f,
+        -1.06637436e-02f, 3.31166222e-03f, -7.83233002e-03f, 2.30525669e-03f,
+        8.27273186e-02f, -1.06267440e-02f, 1.71500107e-02f, 3.04255951e-02f,
+        -1.29040329e-02f, 3.14119172e-03f, -6.89970189e-03f, 2.58446786e-05f,
+        -4.76788736e-03f, -1.67322244e-03f, -3.26918502e-03f, -3.11146451e-03f,
+        -1.78119815e-03f, -4.78193677e-03f, 2.71317758e-04f, -7.61517467e-03f,
+        4.87679224e-03f, -1.76385092e-02f, 8.41807416e-02f, 2.87785558e-02f,
+        -1.62073406e-02f, 5.81977452e-03f, -9.30268239e-03f, 2.36875800e-03f,
+        -7.21869141e-03f, 9.80749733e-04f, -6.24474148e-03f, 2.76390153e-04f,
+        -5.73085076e-03f, -1.02739557e-04f, -5.43858904e-03f, -4.02150728e-04f,
+        -4.74398795e-03f, 3.87029138e-02f, -7.66450845e-03f, 1.98239812e-03f,
+        -8.40059958e-03f, 4.45974576e-03f, -1.50446568e-02f, 6.97863853e-02f,
+        1.13756803e-02f, -8.33129468e-03f, -2.50160898e-05f, -4.15574292e-03f,
+        -2.76720102e-03f, -1.35046215e-03f, -7.61096924e-03f, 1.73791185e-01f,
+        1.19975993e-02f, -1.02483968e-02f, 2.71785174e-03f, -7.71506736e-03f,
+        1.93759865e-03f, -8.20370081e-03f, 5.30659279e-03f, 6.60718548e-02f,
+        -5.84391568e-03f, -2.05893424e-03f, -2.95414454e-03f, -2.93654314e-03f,
+        -2.85230879e-03f, -2.23200931e-03f, -5.64992162e-03f, 2.59555104e-02f,
+        1.04681841e-02f, -1.17922507e-02f, 5.80276618e-03f, -1.25455936e-02f,
+        9.46598555e-03f, -2.14441211e-02f, 4.43988001e-02f, 3.35316541e-02f,
+        8.73570576e-03f, 6.50797022e-02f, -2.69682755e-02f, 1.49823052e-02f,
+        -6.45192897e-03f, 3.29346822e-02f, 4.64754542e-02f, -9.44465912e-03f,
+        -1.69338834e-03f, -1.50450859e-03f, -7.02071172e-03f, 2.88509524e-02f,
+        3.70307483e-03f, 2.81135877e-02f, -2.76566418e-03f, -2.74137397e-03f,
+        -3.11692546e-03f, -2.53270565e-03f, -2.93813987e-03f, -3.63162157e-03f,
+        1.91445466e-03f, 6.48610668e-02f, -1.49476806e-02f, 7.38160553e-03f,
+        -1.38202110e-02f, 1.07650082e-02f, -2.32735371e-02f, 5.60125007e-02f,
+        5.07429277e-02f, 9.29364625e-03f, 1.85741062e-02f, -1.24204826e-02f,
+        2.87828806e-03f, -6.33625317e-03f, -9.96331345e-04f, -3.23061576e-03f,
+        -4.00760952e-03f, 3.75302475e-04f, -9.87692197e-03f, 2.77516027e-02f,
+        2.10860163e-02f, -3.35964405e-03f, 3.05991013e-02f, -1.15895198e-02f,
+        2.58588534e-03f, -6.65338348e-03f, -9.92410308e-05f, -4.76129054e-03f,
+        -1.63490870e-03f, -3.37217067e-03f, -3.02889016e-03f, -1.78299894e-03f,
+        -5.29549151e-03f, 1.32929445e-02f, 3.99639995e-03f, 2.40605323e-02f,
+        4.63126597e-02f, -1.50276700e-02f, 3.44535193e-02f, -9.33396791e-03f,
+        2.81344929e-03f, -9.09721828e-03f, 2.88443117e-02f, -2.19764701e-03f,
+        2.08456957e-02f, 7.91401375e-03f, 6.92112027e-03f, 8.90646874e-04f,
+        2.72500903e-02f, -1.18314244e-02f, 6.03275380e-02f, -6.73453612e-03f,
+        2.05906729e-03f, -8.90936212e-03f, 5.87058157e-03f, 1.52312126e-02f,
+        3.11255265e-02f, 4.31822300e-02f, -9.12236132e-03f, 5.83401307e-04f,
+        -4.83898416e-03f, -1.68000358e-03f, -3.47077287e-03f, -2.41490889e-03f,
+        -3.76018807e-03f, 4.18661511e-03f, 8.71091870e-03f, -9.91923459e-03f,
+        2.09600962e-02f, 1.93663179e-02f, -3.15590807e-03f, -7.30999549e-03f,
+        1.30378281e-02f, -5.57381899e-03f, 1.85275679e-02f, 2.39368428e-02f,
+        -6.91844779e-03f, -3.42361205e-03f, 2.07206358e-03f, 1.34769468e-02f,
+        3.49171591e-02f, 5.44972234e-02f, -1.46320012e-02f, 4.08725587e-03f,
+        -6.65721172e-03f, -2.58924345e-03f, 1.26683807e-02f, 1.47473038e-02f,
+        -1.31830011e-02f, 1.11776302e-02f, 1.35690756e-03f, -3.32222083e-03f,
+        8.37419716e-03f, 6.61166193e-04f, -4.98705526e-03f, 2.52335283e-02f,
+        -4.83141430e-03f, -1.50321968e-03f, 2.75589897e-02f, -8.84052829e-05f,
+        -5.19648563e-03f, -8.62039939e-05f, 1.90762062e-03f, -2.43919923e-03f,
+        2.62525158e-03f, -1.73671452e-03f, -1.37057386e-03f, 7.28466321e-03f,
+        5.76232355e-03f, -6.33041929e-03f, 1.01476436e-02f, 2.92884243e-02f,
+        8.57760470e-03f, 5.33042175e-03f, 8.28695349e-04f, 1.18057887e-02f,
+        3.76629845e-02f, 1.24546241e-02f, 8.33349103e-03f, -8.71241625e-03f,
+        8.29163488e-04f, 5.53288309e-03f, 1.79616342e-03f, -6.45551560e-03f,
+        4.92534234e-04f, -6.10151397e-03f, 7.54234030e-04f, 3.68114326e-03f,
+        1.97963306e-02f, 8.07662733e-03f, -6.31486547e-03f, -4.72893382e-04f,
+        7.85070678e-03f, -2.01210510e-03f, -3.78300737e-03f, -1.70603556e-03f,
+        4.03511966e-04f, 1.39920331e-02f, 1.61592430e-03f, -4.45808714e-03f,
+        -1.66392825e-03f, 2.60943527e-03f, -2.76701103e-03f, 3.18296389e-03f,
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+        1.16780024e-04f, 1.16730647e-04f, 1.16563096e-04f, 1.17140805e-04f,
+        1.16953512e-04f, 1.16722331e-04f, 1.16841179e-04f, 1.16718356e-04f,
+        1.16745246e-04f, 1.16679991e-04f, 1.16801716e-04f, 1.16668854e-04f,
+        1.16767773e-04f, 1.16671911e-04f, 1.16724938e-04f, 1.16669796e-04f,
+        1.16773348e-04f, 1.16705384e-04f, 1.17030552e-04f, 1.16898259e-04f,
+        1.16805004e-04f, 1.16883206e-04f, 1.16752661e-04f, 1.16781372e-04f,
+        1.16746817e-04f, 1.16840667e-04f, 1.16890798e-04f, 1.16774792e-04f,
+        1.16827640e-04f, 1.16852752e-04f, 1.16800503e-04f, 1.16867094e-04f,
+        1.16735951e-04f, 1.17052157e-04f, 1.17031890e-04f, 1.16850697e-04f,
+        1.16929641e-04f, 1.16844809e-04f, 1.16896133e-04f, 1.16807059e-04f,
+        1.16892009e-04f, 1.16822521e-04f, 1.16864234e-04f, 1.16893378e-04f,
+        1.16837717e-04f, 1.16864623e-04f, 1.16868103e-04f, 1.16834682e-04f,
+        1.16890221e-04f, 1.16848841e-04f, 1.16841036e-04f, 1.16891785e-04f,
+        1.16847186e-04f, 1.16846718e-04f, 1.16962674e-04f, 1.16941277e-04f,
+        1.16946140e-04f, 1.16891412e-04f, 1.16867282e-04f, 1.16874643e-04f,
+        1.16851452e-04f, 1.16845610e-04f, 1.16827261e-04f, 1.16853837e-04f,
+        1.16809300e-04f, 1.16839449e-04f, 1.16811066e-04f, 1.16833744e-04f,
+        1.16823582e-04f, 1.16884161e-04f, 1.16763300e-04f, 1.16958613e-04f,
+        1.16822078e-04f, 1.16899156e-04f, 1.16695723e-04f, 1.17264948e-04f,
+        1.17626091e-04f, 1.16833643e-04f, 1.17540223e-04f, 1.17143769e-04f,
+        1.16873455e-04f, 1.16945459e-04f, 1.16722876e-04f, 1.17069801e-04f,
+        1.17090789e-04f, 1.16782019e-04f, 1.16974635e-04f, 1.16696578e-04f,
+        1.16770473e-04f, 1.16638935e-04f, 1.16931465e-04f, 1.16657968e-04f,
+        1.16944971e-04f, 1.16989125e-04f, 1.16693635e-04f, 1.16766928e-04f,
+        1.16688311e-04f, 1.16770835e-04f, 1.16782059e-04f, 1.16613220e-04f,
+        1.16818218e-04f, 1.16868154e-04f, 1.16636650e-04f, 1.16702516e-04f,
+        1.16612594e-04f, 1.16616507e-04f, 1.16564641e-04f, 1.16609004e-04f,
+        1.16537354e-04f, 1.16556169e-04f, 1.16504712e-04f, 1.16503942e-04f,
+        1.16486633e-04f, 1.16496463e-04f, 1.16469546e-04f, 1.16603368e-04f,
+        1.16502466e-04f, 1.16459544e-04f, 1.16482977e-04f, 1.16398599e-04f,
+        1.16401035e-04f, 1.16353237e-04f, 1.16454268e-04f, 1.16437631e-04f,
+        1.16326788e-04f, 1.16386379e-04f, 1.16319163e-04f, 1.16318122e-04f,
+        1.16277268e-04f, 1.16272538e-04f, 1.16412581e-04f, 1.16274337e-04f,
+        1.16276918e-04f, 1.16236274e-04f, 1.16222895e-04f, 1.16186146e-04f,
+        1.16168759e-04f, 1.16173789e-04f, 1.16124297e-04f, 1.16150207e-04f,
+        1.16096592e-04f, 1.16085286e-04f, 1.16075974e-04f, 1.16045908e-04f,
+        1.16057487e-04f, 1.16026196e-04f, 1.15992060e-04f, 1.16005520e-04f,
+        1.15973469e-04f, 1.15939367e-04f, 1.15982297e-04f, 1.15941020e-04f,
+        1.15909140e-04f, 1.15895090e-04f, 1.15882050e-04f, 1.15841146e-04f,
+        1.15822843e-04f, 1.15797194e-04f, 1.15776136e-04f, 1.15760380e-04f,
+        1.15732005e-04f, 1.15722099e-04f, 1.15699453e-04f, 1.15673492e-04f,
+        1.15662507e-04f, 1.15643895e-04f, 1.15608196e-04f, 1.15665634e-04f,
+        1.15624567e-04f, 1.15577974e-04f, 1.15557626e-04f, 1.15529511e-04f,
+        1.15505514e-04f, 1.15478201e-04f, 1.15449933e-04f, 1.15432874e-04f,
+        1.15397606e-04f, 1.15384862e-04f, 1.15349710e-04f, 1.15368545e-04f,
+        1.15338955e-04f, 1.15317473e-04f, 1.15285037e-04f, 1.15246285e-04f,
+        1.15221257e-04f, 1.15201562e-04f, 1.15166608e-04f, 1.15152692e-04f,
+        1.15129615e-04f, 1.15121034e-04f, 1.15058928e-04f, 1.15073336e-04f,
+        1.15030810e-04f, 1.15045862e-04f, 1.14958380e-04f, 1.14997152e-04f,
+        1.14891509e-04f, 1.14953552e-04f, 1.14806036e-04f, 1.14941507e-04f,
+        1.14664094e-04f, 1.15362544e-04f, 1.15487201e-04f, 1.14818430e-04f,
+        1.15512828e-04f, 1.14928150e-04f, 1.14803369e-04f, 1.14769408e-04f,
+        1.14603742e-04f, 1.15029777e-04f, 1.14714220e-04f, 1.14667303e-04f,
+        1.14610820e-04f, 1.14502449e-04f, 1.14412888e-04f, 1.14513106e-04f,
+        1.14542551e-04f, 1.14441401e-04f, 1.14743738e-04f, 1.14365681e-04f,
+        1.14384891e-04f, 1.14292618e-04f, 1.14288090e-04f, 1.14303542e-04f,
+        1.14159858e-04f, 1.14256163e-04f, 1.14386152e-04f, 1.14111573e-04f,
+        1.14150895e-04f, 1.14057169e-04f, 1.14034518e-04f, 1.13955821e-04f,
+        1.13976013e-04f, 1.13896817e-04f, 1.13893375e-04f, 1.13824824e-04f,
+        1.13801144e-04f, 1.13767273e-04f, 1.13750949e-04f, 1.13744283e-04f,
+        1.13830122e-04f, 1.13662588e-04f, 1.13678071e-04f, 1.13596433e-04f,
+        1.13545777e-04f, 1.13507773e-04f, 1.13489423e-04f, 1.13521043e-04f,
+        1.13417991e-04f, 1.13403857e-04f, 1.13393065e-04f, 1.13334377e-04f,
+        1.13338132e-04f, 1.13227475e-04f, 1.13376428e-04f, 1.13267227e-04f,
+        1.13192053e-04f, 1.13157312e-04f, 1.13112701e-04f, 1.13064951e-04f,
+        1.13018081e-04f, 1.13002003e-04f, 1.12938620e-04f, 1.12954766e-04f,
+        1.12881339e-04f, 1.12853609e-04f, 1.12828451e-04f, 1.12768706e-04f,
+        1.12763453e-04f, 1.12704920e-04f, 1.12668592e-04f, 1.12654951e-04f,
+        1.12604144e-04f, 1.12593529e-04f, 1.12583193e-04f, 1.12519839e-04f,
+        1.12470711e-04f, 1.12423929e-04f, 1.12383284e-04f, 1.12342900e-04f,
+        1.12303069e-04f, 1.12265549e-04f, 1.12230849e-04f, 1.12195265e-04f,
+        1.12151607e-04f, 1.12125070e-04f, 1.12076121e-04f, 1.12056183e-04f,
+        1.12007337e-04f, 1.11970341e-04f, 1.11974070e-04f, 1.11935441e-04f,
+        1.11856269e-04f, 1.11852759e-04f, 1.11759197e-04f, 1.11775247e-04f,
+        1.11672399e-04f, 1.11709814e-04f, 1.11543098e-04f, 1.11905522e-04f,
+        1.11868117e-04f, 1.11566767e-04f, 1.11875824e-04f, 1.11495153e-04f,
+        1.11499078e-04f, 1.11365987e-04f, 1.11359907e-04f, 1.11484922e-04f,
+        1.11277326e-04f, 1.11275050e-04f, 1.11177328e-04f, 1.11132086e-04f,
+        1.11037988e-04f, 1.11123554e-04f, 1.10993545e-04f, 1.11096613e-04f,
+        1.11040175e-04f, 1.10882597e-04f, 1.10886426e-04f, 1.10793303e-04f,
+        1.10799738e-04f, 1.10716222e-04f, 1.10665290e-04f, 1.10749599e-04f,
+        1.10632379e-04f, 1.10563042e-04f, 1.10527937e-04f, 1.10459136e-04f,
+        1.10412388e-04f, 1.10379370e-04f, 1.10325149e-04f, 1.10279540e-04f,
+        1.10237108e-04f, 1.10182352e-04f, 1.10148076e-04f, 1.10107245e-04f,
+    };
+
+} // namespace mutap_test::fixtures
diff --git a/tests/support/echo_scenario.h b/tests/support/echo_scenario.h
index 7953eb4..0c3ae50 100644
--- a/tests/support/echo_scenario.h
+++ b/tests/support/echo_scenario.h
@@ -131,6 +131,14 @@ namespace mutap_test {
         const std::vector<Sample>& error_block() const { return m_e; }
         const std::vector<Sample>& echo_block() const { return m_d; }
 
+        /// Replace the echo path with one of the SAME length (keeps the
+        /// input history), for time-variant-path scenarios (ITU Stage 1:
+        /// the rotating-reflector analogue rebuilds the path per block).
+        void set_echo_path(const Sample* path, size_t n) {
+            assert(n == m_cfg.echo_path.size());
+            std::copy(path, path + n, m_cfg.echo_path.begin());
+        }
+
       private:
         config              m_cfg;
         std::vector<Sample> m_x_work; ///< x history + current block, for the F convolution
diff --git a/tests/support/itu_levels.h b/tests/support/itu_levels.h
new file mode 100644
index 0000000..ebcb6b9
--- /dev/null
+++ b/tests/support/itu_levels.h
@@ -0,0 +1,287 @@
+// SPDX-License-Identifier: MIT
+// Copyright 2026 MuTap contributors
+// Level calibration and measurement for the ITU compliance suite
+// (docs/itu-compliance.md, Stage 1). The recommendations speak in dBm0
+// (electrical, at the network reference point), dBPa (acoustic, at the
+// mouth reference point) and dBov (digital, relative to overload); the
+// simulation runs in linear float. This header pins ONE documented
+// mapping between those planes and provides the meters the test
+// procedures specify.
+//
+// Conventions (the simulation's calibration plane):
+//  - Digital overload is |x| = 1.0. dBov follows ITU-T G.100.1: the
+//    level of a signal relative to a full-scale SQUARE wave, so
+//    L_dBov = 20 log10(rms) and a full-scale sine reads -3.01 dBov.
+//  - dBm0 uses the A-law relationship between the overload point and
+//    the transmission plane: overload = +3.14 dBm0, i.e.
+//    L_dBm0 = L_dBov + 3.14. (Nominal receive -16 dBm0 = -19.14 dBov.)
+//  - dBPa maps through the alignment the P-series uses for hands-free
+//    testing: the nominal acoustic speech level -4.7 dBPa at the MRP is
+//    aligned with the nominal digital active speech level -26 dBov
+//    (P.501/P.56 normalization), giving L_dBov = L_dBPa - 21.3.
+// Any consistent mapping proves the same algorithmic facts; this one is
+// recorded so every number in the compliance suite is traceable.
+
+#pragma once
+
+#include <algorithm>
+#include <cassert>
+#include <cmath>
+#include <cstddef>
+#include <numbers>
+#include <vector>
+
+namespace mutap_test::itu {
+
+    inline constexpr double k_dbov_per_dbm0 = -3.14; ///< L_dBov = L_dBm0 + this
+    inline constexpr double k_dbov_per_dbpa = -21.3; ///< L_dBov = L_dBPa + this
+
+    inline double rms_of(const double* x, size_t n) {
+        double acc = 0.0;
+        for (size_t i = 0; i < n; ++i) {
+            acc += x[i] * x[i];
+        }
+        return std::sqrt(acc / static_cast<double>(n));
+    }
+
+    inline double level_dbov(const double* x, size_t n) {
+        return 20.0 * std::log10(rms_of(x, n));
+    }
+
+    inline double dbm0_to_rms(double dbm0) {
+        return std::pow(10.0, (dbm0 + k_dbov_per_dbm0) / 20.0);
+    }
+    inline double rms_to_dbm0(double rms) {
+        return 20.0 * std::log10(rms) - k_dbov_per_dbm0;
+    }
+    inline double dbpa_to_rms(double dbpa) {
+        return std::pow(10.0, (dbpa + k_dbov_per_dbpa) / 20.0);
+    }
+
+    /// Scale a signal in place to the given total-RMS level in dBm0
+    /// (CSS levels are defined over the WHOLE cycled sequence including
+    /// pauses — P.501 7.2.1.1 b).
+    inline void set_level_dbm0(std::vector<double>& x, double dbm0) {
+        const double r = rms_of(x.data(), x.size());
+        const double g = dbm0_to_rms(dbm0) / r;
+        for (auto& v : x) {
+            v *= g;
+        }
+    }
+
+    /// Crest factor in dB: peak over RMS.
+    inline double crest_factor_db(const double* x, size_t n) {
+        double peak = 0.0;
+        for (size_t i = 0; i < n; ++i) {
+            peak = std::max(peak, std::abs(x[i]));
+        }
+        return 20.0 * std::log10(peak / rms_of(x, n));
+    }
+
+    // ------------------------------------------------------------- A-weighting
+
+    /// IEC 61672 A-weighting as a cascade of bilinear-transformed biquads,
+    /// normalized to 0 dB at 1 kHz for the given sample rate. The analog
+    /// prototype: four zeros at s = 0, double poles at 20.598997 Hz and
+    /// 12194.217 Hz, single poles at 107.65265 Hz and 737.86223 Hz.
+    class a_weighting {
+      public:
+        explicit a_weighting(double fs) {
+            const double pi = std::numbers::pi;
+            // Bilinear transform of each first-order section 1/(s + w) and
+            // zeros s^4 distributed as (1 - z^-1)^4.
+            const double w1 = 2.0 * pi * 20.598997;
+            const double w2 = 2.0 * pi * 107.65265;
+            const double w3 = 2.0 * pi * 737.86223;
+            const double w4 = 2.0 * pi * 12194.217;
+
+            // First-order pole sections: H(z) = (1 + z^-1) / (a0 + a1 z^-1)
+            // from 1/(s + w), bilinear with PER-POLE frequency prewarping
+            // (k_w = w / tan(w / 2fs)) so each pole lands at its analog
+            // frequency — the plain transform shades the 12.2 kHz pole
+            // pair by ~1.5 dB at 10 kHz at audio rates.
+            auto pole = [&](double w) {
+                const double kw = w / std::tan(w / (2.0 * fs));
+                return std::pair<double, double>{kw + w, w - kw}; // a0, a1
+            };
+            const auto [p1a0, p1a1] = pole(w1);
+            const auto [p2a0, p2a1] = pole(w2);
+            const auto [p3a0, p3a1] = pole(w3);
+            const auto [p4a0, p4a1] = pole(w4);
+
+            // Assemble three biquads: {zero^2/(p1^2)}, {zero^2/(p4^2)},
+            // {1/(p2 p3)} — zeros as (1 - z^-1)^2 pairs.
+            m_sections[0] = {1.0, -2.0, 1.0, p1a0 * p1a0, 2.0 * p1a0 * p1a1, p1a1 * p1a1};
+            m_sections[1] = {1.0, -2.0, 1.0, p4a0 * p4a0, 2.0 * p4a0 * p4a1, p4a1 * p4a1};
+            m_sections[2] = {1.0, 2.0, 1.0, p2a0 * p3a0, p2a0 * p3a1 + p2a1 * p3a0, p2a1 * p3a1};
+            // NOTE the third section carries the (1 + z^-1)^2 numerator that
+            // the two pole-only bilinear sections contribute.
+
+            // Normalize to unity gain at 1 kHz.
+            m_gain         = 1.0;
+            const double g = magnitude_at(1000.0, fs);
+            m_gain         = 1.0 / g;
+        }
+
+        /// Filter a whole buffer (offline use; resets state first).
+        std::vector<double> apply(const std::vector<double>& x) const {
+            std::vector<double> y = x;
+            for (const auto& s : m_sections) {
+                double x1 = 0.0;
+                double x2 = 0.0;
+                double y1 = 0.0;
+                double y2 = 0.0;
+                for (auto& v : y) {
+                    const double in  = v;
+                    const double out = (s.b0 * in + s.b1 * x1 + s.b2 * x2 - s.a1 * y1 - s.a2 * y2) / s.a0;
+                    x2               = x1;
+                    x1               = in;
+                    y2               = y1;
+                    y1               = out;
+                    v                = out;
+                }
+            }
+            for (auto& v : y) {
+                v *= m_gain;
+            }
+            return y;
+        }
+
+        /// Magnitude response at frequency f (for validation).
+        double magnitude_at(double f, double fs) const {
+            const double w  = 2.0 * std::numbers::pi * f / fs;
+            const double c1 = std::cos(w);
+            const double s1 = std::sin(w);
+            const double c2 = std::cos(2.0 * w);
+            const double s2 = std::sin(2.0 * w);
+            double       re = 1.0;
+            double       im = 0.0;
+            for (const auto& s : m_sections) {
+                const double nre = s.b0 + s.b1 * c1 + s.b2 * c2;
+                const double nim = -s.b1 * s1 - s.b2 * s2;
+                const double dre = s.a0 + s.a1 * c1 + s.a2 * c2;
+                const double dim = -s.a1 * s1 - s.a2 * s2;
+                const double den = dre * dre + dim * dim;
+                const double hre = (nre * dre + nim * dim) / den;
+                const double him = (nim * dre - nre * dim) / den;
+                const double ore = re * hre - im * him;
+                const double oim = re * him + im * hre;
+                re               = ore;
+                im               = oim;
+            }
+            return std::hypot(re, im) * m_gain;
+        }
+
+        /// A-weighted level of a buffer in dBm0(A).
+        double level_dbm0a(const std::vector<double>& x) const {
+            const auto y = apply(x);
+            return rms_to_dbm0(rms_of(y.data(), y.size()));
+        }
+
+      private:
+        struct biquad {
+            double b0, b1, b2, a0, a1, a2;
+        };
+        biquad m_sections[3]{};
+        double m_gain = 1.0;
+    };
+
+    // ------------------------------------------------------------ level meters
+
+    /// One-pole exponential mean-square level meter (the 35 ms / 5 ms
+    /// integrators the P.111x test procedures specify). Emits the level
+    /// trace in dBm0 per sample.
+    class exp_level_meter {
+      public:
+        exp_level_meter(double fs, double tau_seconds)
+            : m_alpha(1.0 - std::exp(-1.0 / (fs * tau_seconds))) {}
+
+        std::vector<double> trace_dbm0(const std::vector<double>& x) {
+            std::vector<double> out(x.size());
+            double              ms = 0.0;
+            for (size_t i = 0; i < x.size(); ++i) {
+                ms += m_alpha * (x[i] * x[i] - ms);
+                out[i] = rms_to_dbm0(std::sqrt(std::max(ms, 1e-30)));
+            }
+            return out;
+        }
+
+      private:
+        double m_alpha;
+    };
+
+    /// Peak of the sliding-window RMS (G.168's 35 ms rectangular window).
+    inline double peak_windowed_rms_dbm0(const std::vector<double>& x, double fs, double window_seconds = 0.035) {
+        const size_t n = static_cast<size_t>(fs * window_seconds);
+        assert(x.size() >= n && n > 0);
+        double acc = 0.0;
+        for (size_t i = 0; i < n; ++i) {
+            acc += x[i] * x[i];
+        }
+        double best = acc;
+        for (size_t i = n; i < x.size(); ++i) {
+            acc += x[i] * x[i] - x[i - n] * x[i - n];
+            best = std::max(best, acc);
+        }
+        return rms_to_dbm0(std::sqrt(std::max(best, 1e-30) / static_cast<double>(n)));
+    }
+
+    /// Active speech level after the method of ITU-T P.56: a 30 ms
+    /// two-stage exponential envelope, a 200 ms hangover, and the
+    /// threshold at which the measured active level sits 15.9 dB above
+    /// it (found by scanning candidate thresholds downward from the
+    /// envelope peak in 0.5 dB steps). Returns the ACTIVE level in dBm0
+    /// and, optionally, the activity factor.
+    inline double active_speech_level_dbm0(const std::vector<double>& x, double fs, double* activity = nullptr) {
+        const double g = std::exp(-1.0 / (fs * 0.03));
+        // Two cascaded one-poles on |x| (P.56's p and q).
+        std::vector<double> env(x.size());
+        double              p        = 0.0;
+        double              q        = 0.0;
+        double              env_peak = 0.0;
+        double              sq       = 0.0;
+        for (size_t i = 0; i < x.size(); ++i) {
+            sq += x[i] * x[i];
+            p        = g * p + (1.0 - g) * std::abs(x[i]);
+            q        = g * q + (1.0 - g) * p;
+            env[i]   = q;
+            env_peak = std::max(env_peak, q);
+        }
+        const size_t hangover  = static_cast<size_t>(fs * 0.2);
+        const double margin_db = 15.9;
+
+        double best_level = rms_to_dbm0(std::sqrt(sq / static_cast<double>(x.size())));
+        double best_act   = 1.0;
+        for (double thr_db = 20.0 * std::log10(env_peak); thr_db > 20.0 * std::log10(env_peak) - 60.0; thr_db -= 0.5) {
+            const double thr    = std::pow(10.0, thr_db / 20.0);
+            size_t       active = 0;
+            size_t       hang   = 0;
+            for (size_t i = 0; i < env.size(); ++i) {
+                if (env[i] >= thr) {
+                    hang = hangover;
+                }
+                if (hang > 0) {
+                    ++active;
+                    --hang;
+                }
+            }
+            if (active == 0) {
+                continue;
+            }
+            const double level_db = 20.0 * std::log10(std::sqrt(sq / static_cast<double>(active)));
+            // P.56: as the threshold drops the margin (active level minus
+            // threshold) GROWS; the active level is read where the margin
+            // first reaches 15.9 dB.
+            if (level_db - thr_db >= margin_db) {
+                best_level = level_db - k_dbov_per_dbm0;
+                best_act   = static_cast<double>(active) / static_cast<double>(env.size());
+                break;
+            }
+        }
+        if (activity != nullptr) {
+            *activity = best_act;
+        }
+        return best_level;
+    }
+
+} // namespace mutap_test::itu
diff --git a/tests/support/itu_signals.h b/tests/support/itu_signals.h
new file mode 100644
index 0000000..33b3a8a
--- /dev/null
+++ b/tests/support/itu_signals.h
@@ -0,0 +1,594 @@
+// SPDX-License-Identifier: MIT
+// Copyright 2026 MuTap contributors
+// ITU-T P.501 (04/2025) test-signal generators for the compliance suite
+// (docs/itu-compliance.md, Stage 1). Everything here is GENERATED from
+// the recommendation's algorithmic descriptions — no ITU signal files
+// are redistributed. The layer runs natively at 44.1 kHz, the CSS's own
+// sampling rate: P.501's segment framing is sample-exact only there
+// (350 ms period = 15435 samples), and P.501 7.2.1.1 b lists 44.1 kHz
+// as a preferred calibration rate. The REQUIRED operating rates of the
+// compliance matrix — 48 kHz (MuTap's rate, P.1120's analysis rate) and
+// 16 kHz (the wideband telephony rate) — are served by resample()/
+// make_css_at(): the NOTE 2 interpolation (>60 dB stopband, <0.2 dB
+// ripple), with the CSS period staying sample-exact at every required
+// rate (350 ms = 15435 / 16800 / 5600 samples at 44.1 / 48 / 16 kHz).
+// Formula-based generators (AM-FM, noise, activation) take fs directly.
+//
+// What is spec-exact vs method-equivalent (recorded per the matrix):
+//  - CSS voiced segments: EXACT — the literal sample tables 7-1/7-2 of
+//    P.501 transcribed below (134/229 values, column-major).
+//  - CSS PN segment: compliant-by-construction (flat magnitude, random
+//    conjugate-symmetric 0/pi phases, 8192-point adaptive-systems
+//    variant per 7.2.1.3) but not bit-exact with ITU reference files —
+//    the phase vector is "random" by specification; ours is a fixed
+//    mt19937 seed so every run is reproducible.
+//  - Real-speech sequences (P.501 7.3.x) are recordings and cannot be
+//    generated; the tests that need them are marked in the matrix.
+#pragma once
+
+#include <algorithm>
+#include <cassert>
+#include <cmath>
+#include <cstddef>
+#include <numbers>
+#include <random>
+#include <vector>
+
+#include "mutap/fft.h"
+
+namespace mutap_test::itu {
+
+    inline constexpr double k_fs = 44100.0; ///< native CSS rate (see header)
+
+    // P.501 Table 7-1: the single-talk voiced segment, 3.04 ms at
+    // 44.1 kHz, repeated 16x for 48.62 ms. 16-bit sample values.
+    inline constexpr int k_css_voiced_st[134] = {
+        -76,   112,   298,   472,   628,   776,   916,   1068,  1234,  1398,  1572,  1752,  1932,  2098,  2244,
+        2360,  2456,  2538,  2626,  2730,  2824,  2904,  2964,  2996,  3032,  3072,  3116,  3158,  3180,  3180,
+        3168,  3146,  3132,  3122,  3108,  3096,  3076,  3038,  2992,  2930,  2866,  2808,  2764,  2728,  2686,
+        2632,  2572,  2496,  2432,  2382,  2362,  2368,  2392,  2410,  2430,  2444,  2460,  2472,  2452,  2398,
+        2300,  2178,  2068,  1976,  1892,  1824,  1772,  1742,  1750,  1760,  1762,  1736,  1684,  1624,  1572,
+        1516,  1460,  1390,  1306,  1170,  968,   702,   394,   76,    -244,  -594,  -968,  -1384, -1846, -2356,
+        -2898, -3462, -4024, -4590, -5154, -5716, -6298, -6912, -7556, -8194, -8719, -8998, -8898, -8378, -7492,
+        -6414, -5334, -4428, -3772, -3360, -3128, -3002, -2924, -2870, -2830, -2800, -2792, -2806, -2844, -2888,
+        -2898, -2846, -2698, -2460, -2166, -1846, -1544, -1274, -1032, -818,  -626,  -456,  -298,  -130};
+
+    // P.501 Table 7-2: the double-talk voiced segment, 5.19 ms at
+    // 44.1 kHz, repeated 14x for 72.69 ms; a different pitch from the
+    // single-talk segment so the two stay decorrelated.
+    inline constexpr int k_css_voiced_dt[229] = {
+        -64,   148,   341,   502,   637,   750,   856,   973,   1095,  1230,  1380,  1486,  1591,  1681,  1763,  1844,
+        1927,  2014,  2097,  2170,  2242,  2310,  2364,  2413,  2450,  2474,  2485,  2474,  2446,  2408,  2363,  2322,
+        2287,  2243,  2185,  2109,  2009,  1906,  1806,  1709,  1614,  1515,  1416,  1316,  1212,  1118,  1023,  935,
+        852,   762,   686,   615,   540,   477,   416,   364,   316,   271,   231,   197,   166,   139,   121,   104,
+        96,    88,    88,    96,    97,    109,   124,   139,   158,   178,   206,   227,   255,   291,   323,   357,
+        391,   429,   462,   500,   534,   568,   606,   640,   676,   706,   735,   762,   789,   814,   835,   856,
+        875,   890,   905,   911,   926,   930,   935,   939,   935,   940,   935,   926,   925,   911,   901,   887,
+        875,   857,   845,   826,   812,   789,   766,   751,   727,   709,   690,   660,   645,   626,   604,   588,
+        571,   555,   538,   513,   500,   483,   470,   456,   441,   428,   419,   409,   406,   397,   388,   386,
+        379,   377,   377,   368,   367,   413,   422,   413,   422,   426,   429,   432,   443,   456,   479,   512,
+        561,   618,   686,   770,   856,   959,   1073,  1190,  1319,  1458,  1598,  1749,  1894,  2039,  2179,  2310,
+        2413,  2477,  2488,  2461,  2395,  2299,  2174,  2033,  1864,  1663,  1439,  1188,  905,   588,   255,   -73,
+        -457,  -852,  -1263, -1693, -2153, -2643, -3152, -3687, -4239, -4797, -5381, -5974, -6571, -7170, -7779, -8382,
+        -8968, -9478, -9826, -9925, -9752, -9318, -8667, -7903, -7087, -6287, -5541, -4849, -4202, -3601, -3033, -2506,
+        -2015, -1553, -1120, -726,  -364};
+
+    // ------------------------------------------------------------ FIR helpers
+
+    /// Windowed-sinc linear-phase low-pass (Kaiser window), designed for
+    /// >= 80 dB stopband. Offline test tooling — not RT code.
+    inline std::vector<double> design_lowpass(double fs, double cutoff_hz, size_t taps) {
+        assert(taps % 2 == 1);
+        std::vector<double> h(taps);
+        const double        fc        = cutoff_hz / fs;
+        const long          mid       = static_cast<long>(taps / 2);
+        const double        beta      = 7.857; // Kaiser beta for ~80 dB
+        auto                bessel_i0 = [](double v) {
+            double sum  = 1.0;
+            double term = 1.0;
+            for (int i = 1; i < 32; ++i) {
+                term *= (v / (2.0 * i)) * (v / (2.0 * i));
+                sum += term;
+            }
+            return sum;
+        };
+        const double i0b = bessel_i0(beta);
+        for (long i = 0; i < static_cast<long>(taps); ++i) {
+            const long   m            = i - mid;
+            const double s            = (m == 0) ? 2.0 * fc
+                                                 : std::sin(2.0 * std::numbers::pi * fc * static_cast<double>(m))
+                                            / (std::numbers::pi * static_cast<double>(m));
+            const double r            = static_cast<double>(m) / static_cast<double>(mid);
+            h[static_cast<size_t>(i)] = s * bessel_i0(beta * std::sqrt(std::max(0.0, 1.0 - r * r))) / i0b;
+        }
+        return h;
+    }
+
+    /// Linear-phase FIR from a magnitude response given as corner points
+    /// (log-frequency straight-line interpolation in dB — the form
+    /// P.501's Figures 7-10/7-11 and Hoth-style spectra use), via
+    /// frequency sampling. `corners` = {Hz, dB} pairs, ascending.
+    inline std::vector<double> design_from_corners(double fs, const std::vector<std::pair<double, double>>& corners,
+                                                   size_t fft_size = 4096) {
+        auto gain_at = [&](double f) {
+            if (f <= corners.front().first) {
+                return corners.front().second;
+            }
+            if (f >= corners.back().first) {
+                return corners.back().second;
+            }
+            for (size_t i = 1; i < corners.size(); ++i) {
+                if (f <= corners[i].first) {
+                    const double lf0 = std::log10(corners[i - 1].first);
+                    const double lf1 = std::log10(corners[i].first);
+                    const double t   = (std::log10(f) - lf0) / (lf1 - lf0);
+                    return corners[i - 1].second + t * (corners[i].second - corners[i - 1].second);
+                }
+            }
+            return corners.back().second;
+        };
+        // Zero-phase magnitude sampling, then a real IFFT and circular
+        // shift to make it causal linear-phase.
+        mutap::real_fft     fft(fft_size);
+        std::vector<double> spec(fft_size, 0.0);
+        const double        df = fs / static_cast<double>(fft_size);
+        spec[0]                = std::pow(10.0, gain_at(1e-3) / 20.0);
+        spec[1]                = std::pow(10.0, gain_at(fs / 2.0) / 20.0); // packed Nyquist
+        for (size_t k = 1; k < fft_size / 2; ++k) {
+            spec[2 * k]     = std::pow(10.0, gain_at(df * static_cast<double>(k)) / 20.0);
+            spec[2 * k + 1] = 0.0;
+        }
+        std::vector<double> h(fft_size);
+        fft.inverse(spec.data(), h.data());
+        std::rotate(h.begin(), h.begin() + static_cast<long>(fft_size / 2), h.end());
+        // Hann-window the centre half to bound leakage, keep odd length.
+        const size_t        taps = fft_size / 2 + 1;
+        std::vector<double> out(taps);
+        for (size_t i = 0; i < taps; ++i) {
+            const double w =
+                0.5 - 0.5 * std::cos(2.0 * std::numbers::pi * static_cast<double>(i) / static_cast<double>(taps - 1));
+            out[i] = h[fft_size / 2 - taps / 2 + i] * w;
+        }
+        return out;
+    }
+
+    inline std::vector<double> fir_apply(const std::vector<double>& x, const std::vector<double>& h) {
+        std::vector<double> y(x.size(), 0.0);
+        const size_t        half = h.size() / 2; // compensate linear-phase delay
+        for (size_t n = 0; n < x.size(); ++n) {
+            double acc = 0.0;
+            for (size_t k = 0; k < h.size(); ++k) {
+                const long idx = static_cast<long>(n + half) - static_cast<long>(k);
+                if (idx >= 0 && idx < static_cast<long>(x.size())) {
+                    acc += h[k] * x[static_cast<size_t>(idx)];
+                }
+            }
+            y[n] = acc;
+        }
+        return y;
+    }
+
+    /// The sample-rate converter of P.501 7.2.1.2 NOTE 2: "the
+    /// interpolation filter used for up- and down-sampling should be
+    /// close to an ideal rectangular filter. The stopband attenuation
+    /// should be >60 dB, the passband ripple <0.2 dB." Windowed-sinc
+    /// (Kaiser, ~80 dB design) evaluated per output sample; `out_len`
+    /// pins the exact output length where the spec's framing demands it
+    /// (350 ms = 16800 samples at 48 kHz, 5600 at 16 kHz). Offline
+    /// tooling, not RT code.
+    inline std::vector<double> resample(const std::vector<double>& x, double fs_in, double fs_out, size_t out_len = 0) {
+        if (fs_in == fs_out) {
+            return x;
+        }
+        const double ratio = fs_out / fs_in;
+        const size_t n_out =
+            out_len != 0 ? out_len : static_cast<size_t>(std::llround(static_cast<double>(x.size()) * ratio));
+        const int    half      = 192; // kernel half-width, sized for a sharp transition at 16 kHz output
+        const double cutoff    = 0.5 * std::min(1.0, ratio) * 0.985; // cycles per INPUT sample, transition guard
+        const double beta      = 7.857;                              // Kaiser, ~80 dB stopband
+        auto         bessel_i0 = [](double v) {
+            double sum  = 1.0;
+            double term = 1.0;
+            for (int i = 1; i < 32; ++i) {
+                term *= (v / (2.0 * i)) * (v / (2.0 * i));
+                sum += term;
+            }
+            return sum;
+        };
+        const double        i0b = bessel_i0(beta);
+        std::vector<double> y(n_out, 0.0);
+        for (size_t n = 0; n < n_out; ++n) {
+            const double t   = static_cast<double>(n) / ratio;
+            const long   k0  = static_cast<long>(std::floor(t)) - half + 1;
+            double       acc = 0.0;
+            for (long k = k0; k < k0 + 2 * half; ++k) {
+                if (k < 0 || k >= static_cast<long>(x.size())) {
+                    continue;
+                }
+                const double u = t - static_cast<double>(k);
+                const double s =
+                    (u == 0.0) ? 2.0 * cutoff : std::sin(2.0 * std::numbers::pi * cutoff * u) / (std::numbers::pi * u);
+                const double r = u / static_cast<double>(half);
+                if (std::abs(r) >= 1.0) {
+                    continue;
+                }
+                acc += x[static_cast<size_t>(k)] * s * bessel_i0(beta * std::sqrt(1.0 - r * r)) / i0b;
+            }
+            y[n] = acc;
+        }
+        // No gain normalization: the 2*cutoff-scaled sinc kernel sampled
+        // at unit input spacing already sums to ~1 (measured passband
+        // error < 0.14 dB before this was understood — a 1/(2 cutoff)
+        // "correction" here produces a flat +8.9 dB at 16 kHz).
+        return y;
+    }
+
+    /// P.501 Figure 7-10: the speech-shaping response for the fullband
+    /// CSS PN segment (5 dB/octave tilt, corner-point table).
+    inline std::vector<std::pair<double, double>> speech_shaping_corners() {
+        return {{50.0, -0.8},  {100.0, 9.2},   {200.0, 19.6},  {215.0, 18.8},  {500.0, 13.1},  {1000.0, 8.0},
+                {2850.0, 0.4}, {3600.0, -1.3}, {5000.0, -3.5}, {7690.0, -6.6}, {7800.0, -7.8}, {8700.0, -20.0}};
+    }
+
+    /// P.501 Figure 7-11: the narrow-band CSS band-limiting/shaping
+    /// response (200 Hz - 3.6 kHz, speech tilt, steep upper skirt).
+    inline std::vector<std::pair<double, double>> narrowband_shaping_corners() {
+        return {{50.0, -25.8}, {100.0, -12.8}, {200.0, 17.4},  {215.0, 17.8},   {500.0, 12.2},
+                {1000.0, 7.2}, {2850.0, 0.0},  {3600.0, -2.0}, {3660.0, -20.0}, {3680.0, -30.0}};
+    }
+
+    // ------------------------------------------------------------------- CSS
+
+    enum class css_kind { single_talk, double_talk };
+
+    struct css_config {
+        css_kind kind    = css_kind::single_talk;
+        size_t   periods = 4;     ///< periods to emit (polarity alternates)
+        bool     shaped  = false; ///< apply the Figure 7-10 speech shaping to the PN part
+        unsigned seed    = 501;   ///< PN phase / noise seed (fixed = reproducible)
+    };
+
+    /// One CSS stream per P.501 7.2.1.2/7.2.1.3/7.2.1.4 at 44.1 kHz.
+    /// Single talk: voiced 2144 (134 x 16) + PN 8820 (8192-point block
+    /// cycled) + pause 4471 = 15435 samples (350 ms). Double talk:
+    /// voiced 3206 (229 x 14) + Gaussian noise 8820 + pause 5614 =
+    /// 17640 samples (400 ms). Unit-agnostic amplitude — scale with
+    /// itu::set_level_dbm0 afterwards.
+    inline std::vector<double> make_css(const css_config& cfg) {
+        const bool   st       = cfg.kind == css_kind::single_talk;
+        const int*   tab      = st ? k_css_voiced_st : k_css_voiced_dt;
+        const size_t tab_n    = st ? 134 : 229;
+        const size_t reps     = st ? 16 : 14;
+        const size_t noise_n  = 8820;
+        const size_t period_n = st ? 15435 : 17640;
+        const size_t voiced_n = tab_n * reps;
+        const size_t pause_n  = period_n - voiced_n - noise_n;
+
+        // Voiced part, normalized to unit RMS.
+        std::vector<double> voiced(voiced_n);
+        double              vsq = 0.0;
+        for (size_t i = 0; i < voiced_n; ++i) {
+            voiced[i] = static_cast<double>(tab[i % tab_n]) / 32768.0;
+            vsq += voiced[i] * voiced[i];
+        }
+        const double vrms = std::sqrt(vsq / static_cast<double>(voiced_n));
+        for (auto& v : voiced) {
+            v /= vrms;
+        }
+
+        // Measurement segment: PN (single talk) or Gaussian (double talk),
+        // RMS-matched to the voiced part (i.e. unity).
+        std::vector<double> meas(noise_n);
+        std::mt19937        gen(cfg.seed);
+        if (st) {
+            constexpr size_t            n_fft = 8192;
+            mutap::real_fft             fft(n_fft);
+            std::vector<double>         spec(n_fft, 0.0);
+            std::bernoulli_distribution bit(0.5);
+            spec[0] = 0.0;
+            spec[1] = 0.0; // DC and Nyquist zero
+            for (size_t k = 1; k < n_fft / 2; ++k) {
+                spec[2 * k]     = bit(gen) ? 1.0 : -1.0; // exp(j pi i_k) with i_k in {0,1}
+                spec[2 * k + 1] = 0.0;
+            }
+            std::vector<double> block(n_fft);
+            fft.inverse(spec.data(), block.data());
+            if (cfg.shaped) {
+                const auto h = design_from_corners(k_fs, speech_shaping_corners());
+                block        = fir_apply(block, h);
+            }
+            double msq = 0.0;
+            for (const double v : block) {
+                msq += v * v;
+            }
+            const double mrms = std::sqrt(msq / static_cast<double>(n_fft));
+            for (size_t i = 0; i < noise_n; ++i) {
+                meas[i] = block[i % n_fft] / mrms; // cycled to 200 ms per 7.2.1.2
+            }
+        }
+        else {
+            std::normal_distribution<double> dist(0.0, 1.0);
+            for (auto& v : meas) {
+                v = dist(gen);
+            }
+            double msq = 0.0;
+            for (const double v : meas) {
+                msq += v * v;
+            }
+            const double mrms = std::sqrt(msq / static_cast<double>(noise_n));
+            for (auto& v : meas) {
+                v /= mrms;
+            }
+        }
+
+        std::vector<double> out;
+        out.reserve(period_n * cfg.periods);
+        for (size_t p = 0; p < cfg.periods; ++p) {
+            const double sign = (p % 2 == 0) ? 1.0 : -1.0; // polarity inversion per period
+            for (const double v : voiced) {
+                out.push_back(sign * v);
+            }
+            for (const double v : meas) {
+                out.push_back(sign * v);
+            }
+            for (size_t i = 0; i < pause_n; ++i) {
+                out.push_back(0.0);
+            }
+        }
+        return out;
+    }
+
+    /// CSS at one of the matrix's required operating rates: generated
+    /// at the native 44.1 kHz (where the voiced tables live), then
+    /// converted with the NOTE 2 resampler, output length pinned to the
+    /// sample-exact period count (16800 per period at 48 kHz, 5600 at
+    /// 16 kHz — 350 ms exactly; double-talk 19200 / 6400 for 400 ms).
+    /// At 16 kHz the resampler's anti-alias filter inherently limits
+    /// the CSS to the 8 kHz Nyquist (the wideband condition).
+    inline std::vector<double> make_css_at(const css_config& cfg, double fs_out) {
+        const auto native = make_css(cfg);
+        if (fs_out == k_fs) {
+            return native;
+        }
+        const double period_s = (cfg.kind == css_kind::single_talk) ? 0.350 : 0.400;
+        const auto   n_out    = static_cast<size_t>(std::llround(period_s * fs_out)) * cfg.periods;
+        return resample(native, k_fs, fs_out, n_out);
+    }
+
+    /// Band-limiting per P.501 Table 7-7 (values in Hz: -3 dB point /
+    /// cutoff). NB 3600/4000, WB 7200/8000, SWB 14400/16000. At the
+    /// 44.1 kHz native rate fullband needs no filter.
+    enum class bandwidth { narrowband, wideband, super_wideband, fullband };
+
+    inline std::vector<double> band_limit(const std::vector<double>& x, bandwidth bw, double fs = k_fs) {
+        double cutoff = 0.0;
+        switch (bw) {
+        case bandwidth::narrowband:
+            cutoff = 3800.0;
+            break; // -3 dB ~3.6k, deep by 4k
+        case bandwidth::wideband:
+            cutoff = 7600.0;
+            break; // -3 dB ~7.2k, deep by 8k
+        case bandwidth::super_wideband:
+            cutoff = 15200.0;
+            break; // -3 dB ~14.4k, deep by 16k
+        case bandwidth::fullband:
+            return x;
+        }
+        if (cutoff >= fs / 2.0) {
+            return x; // band edge at or above Nyquist: nothing to remove
+        }
+        return fir_apply(x, design_lowpass(fs, cutoff, 1023));
+    }
+
+    // ------------------------------------------- AM-FM orthogonal double talk
+
+    /// One channel of the P.501 7.2.4 AM-FM modulated multi-sine:
+    /// s(t) = [1 + (2/3) cos(2 pi 3 t)] * sum_n A(n) cos(2 pi f0(n) t +
+    /// (df(n)/1 Hz) sin(2 pi t)), with A(n) following the 250 Hz-corner
+    /// 5 dB/octave shaping. The two channels' frequency plans interleave
+    /// (P.501 Table 7-6, wideband) and never overlap once each component
+    /// stays within f0 +- df — that disjointness is what the comb-filter
+    /// analysis of the double-talk echo tests relies on.
+    struct amfm_plan {
+        std::vector<double> f0;
+        std::vector<double> df;
+    };
+
+    inline amfm_plan amfm_send_plan() {
+        amfm_plan    p;
+        const double base[] = {125, 250, 500, 750, 1000, 1250, 1500, 1750};
+        const double dev[]  = {2.5, 5, 10, 15, 20, 25, 30, 35};
+        for (size_t i = 0; i < 8; ++i) {
+            p.f0.push_back(base[i]);
+            p.df.push_back(dev[i]);
+        }
+        for (double f = 2000.0; f <= 7000.0; f += 250.0) {
+            p.f0.push_back(f);
+            p.df.push_back(40.0);
+        }
+        return p;
+    }
+
+    inline amfm_plan amfm_receive_plan() {
+        amfm_plan    p;
+        const double base[] = {180, 270, 540, 810, 1080, 1350, 1620, 1890};
+        const double dev[]  = {2.5, 5, 10, 15, 20, 25, 30, 35};
+        for (size_t i = 0; i < 8; ++i) {
+            p.f0.push_back(base[i]);
+            p.df.push_back(dev[i]);
+        }
+        for (double f = 2160.0; f <= 6900.0; f += 250.0) {
+            p.f0.push_back(f);
+            p.df.push_back(35.0);
+        }
+        return p;
+    }
+
+    inline std::vector<double> make_amfm(const amfm_plan& plan, size_t samples, double fs = k_fs) {
+        std::vector<double> out(samples, 0.0);
+        const double        pi = std::numbers::pi;
+        for (size_t c = 0; c < plan.f0.size(); ++c) {
+            // 5 dB/octave rolloff above the 250 Hz corner (P.501 7.2.4).
+            const double a = (plan.f0[c] <= 250.0) ? 1.0 : std::pow(10.0, -5.0 * std::log2(plan.f0[c] / 250.0) / 20.0);
+            for (size_t n = 0; n < samples; ++n) {
+                const double t = static_cast<double>(n) / fs;
+                out[n] += a * std::cos(2.0 * pi * plan.f0[c] * t + plan.df[c] * std::sin(2.0 * pi * t));
+            }
+        }
+        const double am_f  = 3.0;
+        const double am_mu = 2.0 / 3.0;
+        for (size_t n = 0; n < samples; ++n) {
+            const double t = static_cast<double>(n) / fs;
+            out[n] *= 1.0 + am_mu * std::cos(2.0 * pi * am_f * t);
+        }
+        return out;
+    }
+
+    /// Energy (dB) of a signal inside the comb bands f0 +- (df + guard),
+    /// via one long Hann-windowed FFT — the analysis half of the AM-FM
+    /// method. P.501 7.2.4.1 sets the comb edges at exactly f0 +- df
+    /// (guard 0); widening the guard reaches across the plans' designed
+    /// interleave gaps (e.g. send 250+-5 vs receive 270+-5, 10 Hz apart)
+    /// and destroys the separation floor.
+    inline double comb_band_level_db(const std::vector<double>& x, const amfm_plan& plan, double guard_hz = 0.0,
+                                     double fs = k_fs) {
+        size_t n_fft = 1;
+        while (n_fft < x.size()) {
+            n_fft *= 2;
+        }
+        mutap::real_fft     fft(n_fft);
+        std::vector<double> buf(n_fft, 0.0);
+        // Hann window: the components are not FFT-periodic, and the comb
+        // separation the double-talk analysis needs lives or dies on
+        // spectral leakage.
+        for (size_t i = 0; i < x.size(); ++i) {
+            const double w =
+                0.5
+                - 0.5 * std::cos(2.0 * std::numbers::pi * static_cast<double>(i) / static_cast<double>(x.size() - 1));
+            buf[i] = x[i] * w;
+        }
+        fft.forward_inplace(buf.data());
+        const double df_bin = fs / static_cast<double>(n_fft);
+        double       acc    = 0.0;
+        for (size_t c = 0; c < plan.f0.size(); ++c) {
+            const size_t k0 = static_cast<size_t>((plan.f0[c] - plan.df[c] - guard_hz) / df_bin);
+            const size_t k1 = static_cast<size_t>((plan.f0[c] + plan.df[c] + guard_hz) / df_bin) + 1;
+            for (size_t k = std::max<size_t>(1, k0); k <= std::min(n_fft / 2 - 1, k1); ++k) {
+                acc += buf[2 * k] * buf[2 * k] + buf[2 * k + 1] * buf[2 * k + 1];
+            }
+        }
+        return 10.0 * std::log10(std::max(acc, 1e-30));
+    }
+
+    // --------------------------------------------------- activation sequence
+
+    /// P.501 7.3.4-style activation sequence built on the CSS voiced
+    /// sound (which is also P.340's activation signal): a 500 ms voiced
+    /// token, 500 ms pause, level rising 1 dB per repetition across
+    /// `steps` repetitions. Returns the sequence and the sample index at
+    /// which each token starts (for build-up timing analysis).
+    inline std::vector<double> make_activation_sequence(size_t steps, double start_gain_db,
+                                                        std::vector<size_t>* token_starts = nullptr, double fs = k_fs) {
+        const size_t        token_n = static_cast<size_t>(0.5 * k_fs);
+        std::vector<double> token(token_n);
+        double              sq = 0.0;
+        for (size_t i = 0; i < token_n; ++i) {
+            token[i] = static_cast<double>(k_css_voiced_st[i % 134]) / 32768.0;
+            sq += token[i] * token[i];
+        }
+        const double rms = std::sqrt(sq / static_cast<double>(token_n));
+        for (auto& v : token) {
+            v /= rms;
+        }
+        if (fs != k_fs) { // other required rates: NOTE 2 resampling of the token
+            token = resample(token, k_fs, fs, static_cast<size_t>(0.5 * fs));
+        }
+        const size_t        tok_n = token.size();
+        const size_t        pau_n = tok_n;
+        std::vector<double> out;
+        out.reserve((tok_n + pau_n) * steps);
+        for (size_t s = 0; s < steps; ++s) {
+            const double g = std::pow(10.0, (start_gain_db + static_cast<double>(s)) / 20.0);
+            if (token_starts != nullptr) {
+                token_starts->push_back(out.size());
+            }
+            for (const double v : token) {
+                out.push_back(g * v);
+            }
+            out.insert(out.end(), pau_n, 0.0);
+        }
+        return out;
+    }
+
+    // ------------------------------------------------------------ noise fields
+
+    /// Hoth noise (the P.800/P.340 room-noise spectrum): white noise
+    /// shaped by the standard Hoth density corners (relative dB).
+    inline std::vector<double> make_hoth_noise(size_t samples, unsigned seed, double fs = k_fs) {
+        static const std::vector<std::pair<double, double>> k_corners = {
+            {100.0, 0.0},    {200.0, -1.7},   {400.0, -5.7},   {800.0, -12.4},
+            {1000.0, -14.7}, {2000.0, -22.6}, {4000.0, -30.5}, {8000.0, -39.0}};
+        std::mt19937                     gen(seed);
+        std::normal_distribution<double> dist(0.0, 1.0);
+        std::vector<double>              x(samples);
+        for (auto& v : x) {
+            v = dist(gen);
+        }
+        return fir_apply(x, design_from_corners(fs, k_corners));
+    }
+
+    /// Synthetic driving-noise analogue (labeled as such in the matrix:
+    /// the automotive recs use vehicle-specific recordings; this is the
+    /// documented stand-in): low-frequency-dominated noise, -12 dB/oct
+    /// above 120 Hz with a mild shelf, non-stationary +-2 dB slow
+    /// amplitude wander.
+    inline std::vector<double> make_driving_noise(size_t samples, unsigned seed, double fs = k_fs) {
+        static const std::vector<std::pair<double, double>> k_corners = {
+            {50.0, 0.0},     {120.0, 0.0},    {240.0, -12.0},  {480.0, -22.0},
+            {1000.0, -30.0}, {4000.0, -42.0}, {12000.0, -54.0}};
+        std::mt19937                     gen(seed);
+        std::normal_distribution<double> dist(0.0, 1.0);
+        std::vector<double>              x(samples);
+        for (auto& v : x) {
+            v = dist(gen);
+        }
+        auto         y  = fir_apply(x, design_from_corners(fs, k_corners));
+        const double pi = std::numbers::pi;
+        for (size_t n = 0; n < y.size(); ++n) {
+            const double t = static_cast<double>(n) / fs;
+            y[n] *= std::pow(10.0, 2.0 * std::sin(2.0 * pi * 0.13 * t) / 20.0);
+        }
+        return y;
+    }
+
+    // ----------------------------------------------- time-variant echo paths
+
+    /// The rotating-reflector analogue of P.1110 11.11.6 / P.1120
+    /// 11.11.6: a base impulse response plus one early reflection whose
+    /// delay sweeps sinusoidally (a moving surface changes a path
+    /// length) and whose amplitude follows the rotation. path(t) is
+    /// rebuilt per block by the caller via fill().
+    struct moving_reflector {
+        std::vector<double> base;               ///< the static room/cabin IR
+        double              tap_gain = 0.1;     ///< reflector strength vs unit-energy base
+        double              delay0_s = 0.004;   ///< mean extra path delay
+        double              sweep_s  = 0.0008;  ///< delay sweep amplitude (+- ~27 cm)
+        double              rate_hz  = 0.25;    ///< rotation rate (15 rpm = 0.25 Hz)
+        double              fs       = 48000.0; ///< the simulation rate the path runs at
+
+        void fill(double t_seconds, std::vector<double>& path) const {
+            path.assign(base.begin(), base.end());
+            const double d  = delay0_s + sweep_s * std::sin(2.0 * std::numbers::pi * rate_hz * t_seconds);
+            const double g  = tap_gain * std::abs(std::cos(2.0 * std::numbers::pi * rate_hz * t_seconds));
+            const double ds = d * fs;
+            const size_t i0 = static_cast<size_t>(ds);
+            const double fr = ds - static_cast<double>(i0);
+            if (i0 + 1 < path.size()) { // linear-interpolated fractional tap
+                path[i0] += g * (1.0 - fr);
+                path[i0 + 1] += g * fr;
+            }
+        }
+    };
+
+} // namespace mutap_test::itu
diff --git a/tests/test_itu_signals.cpp b/tests/test_itu_signals.cpp
new file mode 100644
index 0000000..f3ef483
--- /dev/null
+++ b/tests/test_itu_signals.cpp
@@ -0,0 +1,329 @@
+// SPDX-License-Identifier: MIT
+// Copyright 2026 MuTap contributors
+//
+// Validation of the ITU signal layer (docs/itu-compliance.md, Stage 1):
+// the generated signals must match the properties P.501 publishes and
+// the instruments must read known signals correctly, or every number the
+// compliance suite later produces is untrustworthy. Thresholds follow
+// the house workflow — measured first, asserted with margin:
+//
+//   CSS ST period 15435 samples exact; voiced/PN RMS ratio 1.0000/1.0003;
+//   PN crest 10.97 dB (spec 11 +- 1); PN bin-power stddev 0.000 dB;
+//   level calibration error 0.00 dB; DT noise crest 12.09 (spec 12 +- 1);
+//   shaped-PN crest 9.82 dB; A-weighting 100 Hz -19.18 / 1 kHz 0.00 /
+//   10 kHz -1.76 dB (analog nominals -19.1 / 0 / -2.5; the 10 kHz point
+//   documents the prewarped-bilinear residual, IEC class-1 tolerance is
+//   +2.6/-3.6 dB there); NB band-limit 0.0 dB at 3.4 kHz, -85.2 dB at
+//   4 kHz, -106.5 at 5 kHz; AM-FM comb separation 94.3 dB with the
+//   spec's exact band edges (guard 0 — an 8 Hz guard collapses it to
+//   19 dB by reaching across the plans' 10 Hz interleave gaps); Hoth
+//   octave decline 100-200 -> 4k-8k measured 18.1 dB; driving-noise LF
+//   dominance 27.6 dB; cabin fixture RT60 66.6 ms (G.167 car figure:
+//   ~60 ms typical); P.56 meter on sparse bursts: activity 0.312 with
+//   level delta +5.06 dB (= 10 log10(1/activity), exact), and on CSS
+//   activity ~1 (the 101 ms pause is inside P.56's 200 ms hangover —
+//   the G.168 active-part corrections are the separate arithmetic
+//   constants +1.49/+1.66 dB, reproduced by our exact segment sizes).
+
+#include <cmath>
+#include <cstddef>
+#include <numbers>
+#include <vector>
+
+#include <gtest/gtest.h>
+
+#include "fixtures/rir_cabin.h"
+#include "support/itu_levels.h"
+#include "support/itu_signals.h"
+
+namespace {
+
+    using namespace mutap_test;
+
+    TEST(ItuCss, SingleTalkStructureIsSpecExact) {
+        itu::css_config cfg;
+        cfg.periods    = 4;
+        const auto css = itu::make_css(cfg);
+        ASSERT_EQ(css.size(), 4U * 15435U) << "350 ms at 44.1 kHz, sample-exact";
+
+        // Segment levels: voiced and PN parts RMS-matched (P.501 requires
+        // equal levels), pause silent.
+        const double vr = itu::rms_of(css.data(), 2144);
+        const double pr = itu::rms_of(css.data() + 2144, 8820);
+        EXPECT_NEAR(20.0 * std::log10(vr / pr), 0.0, 0.05) << "measured 0.003 dB";
+        EXPECT_EQ(itu::rms_of(css.data() + 10964, 4471), 0.0);
+
+        // Polarity inversion between periods (offset-free long sequence).
+        for (size_t i = 0; i < 2144; ++i) {
+            ASSERT_EQ(css[i], -css[15435 + i]);
+        }
+    }
+
+    TEST(ItuCss, PnSegmentCrestAndFlatness) {
+        const auto css = itu::make_css({});
+        EXPECT_NEAR(itu::crest_factor_db(css.data() + 2144, 8820), 11.0, 1.0)
+            << "P.501 spec 11 +- 1 dB; measured 10.97";
+
+        // Flat magnitude by construction: every FFT bin of the 8192-point
+        // block has identical power (measured stddev 0.000 dB).
+        mutap::real_fft     fft(8192);
+        std::vector<double> b(css.begin() + 2144, css.begin() + 2144 + 8192);
+        fft.forward_inplace(b.data());
+        double sum  = 0.0;
+        double sum2 = 0.0;
+        int    n    = 0;
+        for (size_t k = 16; k < 3700; ++k) {
+            const double d = 10.0 * std::log10(b[2 * k] * b[2 * k] + b[2 * k + 1] * b[2 * k + 1]);
+            sum += d;
+            sum2 += d * d;
+            ++n;
+        }
+        const double mean = sum / n;
+        EXPECT_LT(std::sqrt(std::max(0.0, sum2 / n - mean * mean)), 0.1);
+    }
+
+    TEST(ItuCss, DoubleTalkStructureAndCrest) {
+        itu::css_config cfg;
+        cfg.kind       = itu::css_kind::double_talk;
+        cfg.periods    = 4;
+        const auto css = itu::make_css(cfg);
+        ASSERT_EQ(css.size(), 4U * 17640U) << "400 ms at 44.1 kHz, sample-exact";
+        EXPECT_NEAR(itu::crest_factor_db(css.data() + 3206, 8820), 12.0, 1.0)
+            << "P.501 spec 12 +- 1 dB; measured 12.09";
+    }
+
+    TEST(ItuCss, LevelCalibrationIsExact) {
+        auto css = itu::make_css({});
+        itu::set_level_dbm0(css, -16.0);
+        EXPECT_NEAR(itu::rms_to_dbm0(itu::rms_of(css.data(), css.size())), -16.0, 0.01);
+        // G.168's active-part corrections fall out of the exact segment
+        // sizes: 10 log10(15435/10964) and 10 log10(17640/12026).
+        EXPECT_NEAR(10.0 * std::log10(15435.0 / 10964.0), 1.485, 0.01);
+        EXPECT_NEAR(10.0 * std::log10(17640.0 / 12026.0), 1.664, 0.01);
+    }
+
+    TEST(ItuLevels, AWeightingSpotGains) {
+        const itu::a_weighting aw(itu::k_fs);
+        const auto             db = [&](double f) { return 20.0 * std::log10(aw.magnitude_at(f, itu::k_fs)); };
+        EXPECT_NEAR(db(100.0), -19.1, 0.5) << "measured -19.18";
+        EXPECT_NEAR(db(1000.0), 0.0, 0.05);
+        // Prewarped-bilinear residual at 10 kHz: measured -1.76 vs the
+        // analog -2.5; IEC 61672 class-1 tolerance there is +2.6/-3.6.
+        EXPECT_NEAR(db(10000.0), -2.5, 2.0);
+    }
+
+    TEST(ItuSignals, NarrowbandLimiterMeetsMask) {
+        auto probe = [&](double f) {
+            std::vector<double> s(static_cast<size_t>(itu::k_fs));
+            for (size_t i = 0; i < s.size(); ++i) {
+                s[i] = std::sin(2.0 * std::numbers::pi * f * static_cast<double>(i) / itu::k_fs);
+            }
+            const auto y = itu::band_limit(s, itu::bandwidth::narrowband);
+            return 20.0
+                   * std::log10(itu::rms_of(y.data() + 8000, y.size() - 16000)
+                                / itu::rms_of(s.data() + 8000, s.size() - 16000));
+        };
+        EXPECT_GT(probe(3400.0), -1.0) << "passband (measured 0.0 dB)";
+        EXPECT_LT(probe(4000.0), -70.0) << "P.501 Table 7-7 cutoff (measured -85.2 dB)";
+        EXPECT_LT(probe(5000.0), -80.0) << "measured -106.5 dB";
+    }
+
+    // THE PROPERTY THE DOUBLE-TALK ECHO TESTS STAND ON: the send and
+    // receive AM-FM plans are orthogonal under the spec's own comb
+    // analysis. Measured separation 94.3 dB with exact band edges — the
+    // measurable echo-loss floor is far beyond the >= 33 dB margin
+    // targets. (Guard discipline matters: +8 Hz of guard collapses this
+    // to 19 dB via the send-250/receive-270 adjacency.)
+    TEST(ItuSignals, AmFmPlansAreOrthogonal) {
+        const auto   sp    = itu::amfm_send_plan();
+        const auto   rp    = itu::amfm_receive_plan();
+        const auto   snd   = itu::make_amfm(sp, static_cast<size_t>(4 * itu::k_fs));
+        const double own   = itu::comb_band_level_db(snd, sp);
+        const double cross = itu::comb_band_level_db(snd, rp);
+        EXPECT_GT(own - cross, 60.0) << "measured 94.3 dB";
+    }
+
+    TEST(ItuSignals, NoiseFieldsHaveTheirSpectra) {
+        auto octave_db = [&](const std::vector<double>& x, double f0, double f1) {
+            constexpr size_t    n_fft = 65536;
+            mutap::real_fft     fft(n_fft);
+            std::vector<double> b(x.begin(), x.begin() + n_fft);
+            fft.forward_inplace(b.data());
+            double acc = 0.0;
+            for (size_t k = static_cast<size_t>(f0 * n_fft / itu::k_fs);
+                 k < static_cast<size_t>(f1 * n_fft / itu::k_fs); ++k) {
+                acc += b[2 * k] * b[2 * k] + b[2 * k + 1] * b[2 * k + 1];
+            }
+            return 10.0 * std::log10(acc);
+        };
+        const auto   hoth  = itu::make_hoth_noise(static_cast<size_t>(4 * itu::k_fs), 7);
+        const double h_lo  = octave_db(hoth, 100.0, 200.0);
+        const double h_mid = octave_db(hoth, 800.0, 1600.0);
+        const double h_hi  = octave_db(hoth, 4000.0, 8000.0);
+        EXPECT_GT(h_lo, h_mid);
+        EXPECT_GT(h_mid, h_hi);
+        EXPECT_NEAR(h_lo - h_hi, 18.1, 4.0) << "Hoth decline, measured 18.1 dB";
+
+        const auto drv = itu::make_driving_noise(static_cast<size_t>(4 * itu::k_fs), 7);
+        EXPECT_GT(octave_db(drv, 60.0, 120.0) - octave_db(drv, 4000.0, 8000.0), 20.0)
+            << "LF dominance, measured 27.6 dB";
+    }
+
+    // The cabin fixture is the automotive echo path of the compliance
+    // suite; G.167 5.2.3.1 gives the car figure as RT ~60 ms typical.
+    TEST(ItuSignals, CabinFixtureReverbTime) {
+        const float*        r = fixtures::k_rir_cabin;
+        const size_t        n = fixtures::k_rir_cabin_taps;
+        std::vector<double> edc(n);
+        double              acc = 0.0;
+        for (size_t i = n; i-- > 0;) {
+            acc += static_cast<double>(r[i]) * static_cast<double>(r[i]);
+            edc[i] = acc;
+        }
+        double t5  = 0.0;
+        double t35 = 0.0;
+        for (size_t i = 0; i < n; ++i) {
+            const double d = 10.0 * std::log10(edc[i] / edc[0]);
+            if (t5 == 0.0 && d <= -5.0) {
+                t5 = static_cast<double>(i) / 48000.0;
+            }
+            if (t35 == 0.0 && d <= -35.0) {
+                t35 = static_cast<double>(i) / 48000.0;
+                break;
+            }
+        }
+        const double rt60_ms = 2.0 * (t35 - t5) * 1000.0;
+        EXPECT_GT(rt60_ms, 50.0) << "measured 66.6 ms";
+        EXPECT_LT(rt60_ms, 80.0) << "measured 66.6 ms";
+    }
+
+    TEST(ItuLevels, ActiveSpeechLevelMeter) {
+        // Sparse bursts: 0.5 s voiced + 2.0 s silence. P.56 activity =
+        // (burst + 200 ms hangover + envelope tail) / period; measured
+        // 0.312 with the level delta the definition demands.
+        std::vector<double> x;
+        for (int b = 0; b < 4; ++b) {
+            for (size_t i = 0; i < static_cast<size_t>(0.5 * itu::k_fs); ++i) {
+                x.push_back(static_cast<double>(itu::k_css_voiced_st[i % 134]) / 3000.0);
+            }
+            x.insert(x.end(), static_cast<size_t>(2.0 * itu::k_fs), 0.0);
+        }
+        double       act = 0.0;
+        const double asl = itu::active_speech_level_dbm0(x, itu::k_fs, &act);
+        const double tot = itu::rms_to_dbm0(itu::rms_of(x.data(), x.size()));
+        EXPECT_NEAR(act, 0.312, 0.05);
+        EXPECT_NEAR(asl - tot, 10.0 * std::log10(1.0 / act), 0.1) << "definitionally consistent";
+
+        // On CSS the 101 ms pause sits inside the 200 ms hangover, so
+        // activity is ~1 and ASL ~ total level (measured -15.93 at -16).
+        auto css = itu::make_css({});
+        itu::set_level_dbm0(css, -16.0);
+        double       css_act = 0.0;
+        const double css_asl = itu::active_speech_level_dbm0(css, itu::k_fs, &css_act);
+        EXPECT_GT(css_act, 0.9);
+        EXPECT_NEAR(css_asl, -16.0, 0.5) << "measured -15.93 dBm0";
+    }
+
+    TEST(ItuSignals, ActivationSequenceGeometry) {
+        std::vector<size_t> starts;
+        const auto          seq = itu::make_activation_sequence(5, -40.0, &starts);
+        ASSERT_EQ(starts.size(), 5U);
+        EXPECT_EQ(starts[1] - starts[0], static_cast<size_t>(itu::k_fs)) << "500 ms token + 500 ms pause";
+        // +1 dB per step.
+        const size_t tn = static_cast<size_t>(0.5 * itu::k_fs);
+        const double l0 = 20.0 * std::log10(itu::rms_of(seq.data() + starts[0], tn));
+        const double l4 = 20.0 * std::log10(itu::rms_of(seq.data() + starts[4], tn));
+        EXPECT_NEAR(l4 - l0, 4.0, 0.01);
+    }
+
+    // ---------------------------------------- the required operating rates
+    // The matrix requires 48 kHz (MuTap's rate, P.1120's analysis rate)
+    // and 16 kHz (the wideband telephony rate) alongside the 44.1 kHz
+    // P.501 reference. Measured: resampler passband ripple <= 0.014 dB
+    // (NOTE 2 allows 0.2), alias rejection 101 dB at 16 kHz output
+    // (NOTE 2 wants > 60); CSS periods sample-exact at every rate
+    // (16800 / 5600 per 350 ms); PN crest 11.86 dB at 48 kHz and
+    // 11.44 dB at 16 kHz (spec 11 +- 1); AM-FM comb separation 94.0 dB
+    // at 48 kHz and 92.6 dB at 16 kHz.
+
+    TEST(ItuRates, ResamplerMeetsNote2) {
+        auto tone = [](double f, double fs, size_t n) {
+            std::vector<double> s(n);
+            for (size_t i = 0; i < n; ++i) {
+                s[i] = std::sin(2.0 * std::numbers::pi * f * static_cast<double>(i) / fs);
+            }
+            return s;
+        };
+        auto through = [&](double f, double fs_out) {
+            const auto   x   = tone(f, 44100.0, 44100);
+            const auto   y   = itu::resample(x, 44100.0, fs_out);
+            const double in  = itu::rms_of(x.data() + 4000, x.size() - 8000);
+            const double out = itu::rms_of(y.data() + 2000, y.size() - 4000);
+            return 20.0 * std::log10(out / in);
+        };
+        // Passband ripple < 0.2 dB (measured <= 0.014 dB).
+        for (const double f : {100.0, 1000.0, 6800.0, 19000.0}) {
+            EXPECT_NEAR(through(f, 48000.0), 0.0, 0.2) << f << " Hz";
+        }
+        for (const double f : {100.0, 1000.0, 7400.0}) {
+            EXPECT_NEAR(through(f, 16000.0), 0.0, 0.2) << f << " Hz";
+        }
+        // Alias rejection > 60 dB (measured ~101 dB).
+        EXPECT_LT(through(10000.0, 16000.0), -60.0) << "measured -101.6 dB";
+        EXPECT_LT(through(12000.0, 16000.0), -60.0) << "measured -102.1 dB";
+    }
+
+    TEST(ItuRates, CssIsSampleExactAtRequiredRates) {
+        for (const double fs : {48000.0, 16000.0}) {
+            itu::css_config cfg;
+            cfg.periods    = 4;
+            const auto css = itu::make_css_at(cfg, fs);
+            ASSERT_EQ(css.size(), 4U * static_cast<size_t>(0.35 * fs)) << fs;
+            // PN crest survives the conversion (spec 11 +- 1; measured
+            // 11.86 at 48 kHz, 11.44 at 16 kHz).
+            const size_t v_n = static_cast<size_t>(2144.0 * fs / 44100.0);
+            const size_t p_n = static_cast<size_t>(8820.0 * fs / 44100.0);
+            EXPECT_NEAR(itu::crest_factor_db(css.data() + v_n, p_n), 11.0, 1.0) << fs;
+
+            cfg.kind      = itu::css_kind::double_talk;
+            const auto dt = itu::make_css_at(cfg, fs);
+            ASSERT_EQ(dt.size(), 4U * static_cast<size_t>(0.4 * fs)) << fs;
+        }
+    }
+
+    TEST(ItuRates, AmFmOrthogonalityHoldsAtRequiredRates) {
+        const auto sp = itu::amfm_send_plan();
+        const auto rp = itu::amfm_receive_plan();
+        for (const double fs : {48000.0, 16000.0}) {
+            const auto   snd = itu::make_amfm(sp, static_cast<size_t>(4 * fs), fs);
+            const double own = itu::comb_band_level_db(snd, sp, 0.0, fs);
+            const double xr  = itu::comb_band_level_db(snd, rp, 0.0, fs);
+            EXPECT_GT(own - xr, 60.0) << fs << " Hz (measured 94.0 / 92.6 dB)";
+        }
+    }
+
+    TEST(ItuSignals, MovingReflectorPathStaysSane) {
+        itu::moving_reflector mr;
+        mr.base.assign(256, 0.0);
+        mr.base[32] = 1.0;
+        std::vector<double> path;
+        double              tap_min = 1e9;
+        double              tap_max = -1e9;
+        for (double t = 0.0; t < 4.0; t += 0.05) {
+            mr.fill(t, path);
+            ASSERT_EQ(path.size(), mr.base.size());
+            EXPECT_EQ(path[32], 1.0) << "base path untouched";
+            double extra = 0.0;
+            for (size_t i = 0; i < path.size(); ++i) {
+                if (i != 32) {
+                    extra += path[i];
+                }
+            }
+            tap_min = std::min(tap_min, extra);
+            tap_max = std::max(tap_max, extra);
+        }
+        EXPECT_NEAR(tap_max, mr.tap_gain, 0.01) << "reflector reaches full strength";
+        EXPECT_LT(tap_min, 0.01) << "and vanishes at the rotation nulls";
+    }
+
+} // namespace
diff --git a/tools/fixtures/make_rir_fixtures.py b/tools/fixtures/make_rir_fixtures.py
index 42bc224..139db38 100644
--- a/tools/fixtures/make_rir_fixtures.py
+++ b/tools/fixtures/make_rir_fixtures.py
@@ -72,6 +72,18 @@
         mic=[9.5, 4.2, 1.6],
         blurb="reverberant hall, mic 5.6 m out — the PA scenario",
     ),
+    # The automotive scenario for the ITU compliance suite (Stage 1):
+    # ~2.6 m^3 enclosure, heavy absorption, RT ~60 ms — the car-interior
+    # figures G.167 5.2.3.1 specifies for mobile echo paths. Speaker in
+    # the footwell, mic at the mirror position.
+    "cabin": dict(
+        dims=[1.9, 1.45, 0.95],
+        absorption=0.75,
+        max_order=40,
+        speaker=[0.35, 0.4, 0.25],
+        mic=[1.1, 0.7, 0.85],
+        blurb="car cabin, mic at the mirror, speaker in the footwell",
+    ),
 }
 
 
@@ -122,10 +134,12 @@ def emit_header(name: str, rir: np.ndarray, provenance: str) -> None:
     print(f"wrote {path} ({len(rir)} taps)")
 
 
-def generate_modeled() -> None:
+def generate_modeled(only: str | None = None) -> None:
     import pyroomacoustics as pra
 
     for name, spec in ROOMS.items():
+        if only is not None and name != only:
+            continue
         room = pra.ShoeBox(
             spec["dims"],
             fs=FS,
@@ -188,11 +202,13 @@ def from_wav(wav_path: str, name: str, source: str) -> None:
 def main() -> None:
     ap = argparse.ArgumentParser(description=__doc__)
     ap.add_argument("--generate", action="store_true", help="rebuild the modeled rooms")
+    ap.add_argument("--only", default=None, help="with --generate: rebuild a single room "
+                    "(committed fixtures are baselines — never regenerate rooms you are not changing)")
     ap.add_argument("--from-wav", nargs=2, metavar=("WAV", "NAME"), help="import a measured RIR")
     ap.add_argument("--source", default="", help="provenance + license text for --from-wav")
     args = ap.parse_args()
     if args.generate:
-        generate_modeled()
+        generate_modeled(args.only)
     elif args.from_wav:
         if not args.source:
             raise SystemExit("--from-wav requires --source (provenance/license is not optional)")