Repair graph vocal tract sample flow
This commit is contained in:
Meta Vens
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6845301f77
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6 changed files with 73 additions and 10 deletions
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@ -279,3 +279,41 @@ global gain:
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If the graph remains under-articulated after closure storage exists, inspect
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the source and boundary probes at the same layer. Do not fix this with another
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global gain.
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## 2026-05-28 Model Repair
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The first real repair pass found four ownership leaks that made the graph sound
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like one buzz wearing different filters.
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- The graph glottal source was emitting an unbounded cubed waveform into the
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tract. It is now locally normalized with `tanh` at the source owner. This is
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not output gain; it keeps the excitation from overpowering the tract state.
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- Segment propagation loss now depends on live segment area. Narrow or
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contact-like sections absorb more wave energy, so closures stop preserving
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motor-like ringing as if they were open vowel tubes.
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- Generated nasal side-port area now maps velum diameter squared directly into
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the side terminal. The previous `0.15` factor was a hidden nasal damper; it
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made `mama`'s nasal windows nearly silent and caused `mama/papa` collapse.
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- Generated tract lips no longer bind lip opening into radiation-port opening,
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and graph radiation no longer multiplies boundary flow by aperture after the
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boundary reflection/geometry already handled it. Rounded vowels in
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`thrombosis` had been killed by this double gate.
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Latest utterance artifact:
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`artifacts/parity/pink-trombone-utterance-logmel/20260528T070759312`.
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The accepted smoke now passes. `mama/papa` separability is no longer collapsed:
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reference log-mel similarity `0.3791`, candidate `0.3651`. `thrombosis` rises
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to cosine `0.4366` with lower silence mismatch. This still is not accepted
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speech articulation; RMS is low and speech-band motion is weak, but different
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articulations now reach different sample-flow paths.
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Latest static artifact:
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`artifacts/parity/pink-trombone-logmel/20260528T071240442`.
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The static closure fixture is now treated as a sealed static closure, not as a
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fake release event. It reports `sealed-static peak=0.000005`; real release
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belongs to utterance fixtures with time history.
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Next pressure after this pass is actual graph-native closure reservoir state:
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store upstream pressure while a constriction is sealed, then release it through
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the same scattering path when the area opens. Do that before adding any more
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source gain.
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@ -834,15 +834,15 @@ public static class FaustEmitter
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var flowName = $"{name}_graph_radiation_flow_{safeTerminal}";
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source.AppendLine($" {admittance} = {ProbeSignal(options, $"/debug/{name}/radiation/{terminal.Name}/admittance", $"sqrt(clip01(({terminalArea}) / max(0.000001, ({terminalArea}) + 1.0)))", 0, 1)};");
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source.AppendLine($" {flowName} = {ProbeSignal(options, $"/debug/{name}/radiation/{terminal.Name}/flow", flow, -2, 2)};");
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radiated.Add($"(({flowName} * 0.30 + ({flowName} : {filter}) * 0.70) * {opening} * {loss} * {admittance})");
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radiated.Add($"(({flowName} * 0.30 + ({flowName} : {filter}) * 0.70) * {loss} * {admittance})");
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}
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}
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foreach (var segment in segments)
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{
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var loss = F(Math.Clamp(segment.Path.Loss, 0, 1));
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var delayExpression = SegmentDelayExpression(segment);
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var maxDelay = SegmentMaxDelay(segment, waveClock);
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var loss = SegmentLossExpression(name, segment);
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source.AppendLine($" {name}_graph_delay_{segment.Index} = {delayExpression};");
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source.AppendLine($" {name}_graph_next_r{segment.Index} = {GraphOutgoing(name, new AcousticGraphPort(segment, true))} : {WaveClockDelayExpression(waveClock, maxDelay, $"{name}_graph_delay_{segment.Index}")} * {loss};");
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source.AppendLine($" {name}_graph_next_l{segment.Index} = {GraphOutgoing(name, new AcousticGraphPort(segment, false))} : {WaveClockDelayExpression(waveClock, maxDelay, $"{name}_graph_delay_{segment.Index}")} * {loss};");
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@ -910,6 +910,9 @@ public static class FaustEmitter
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var releasePressure = localPressure is null
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? "1.0"
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: $"(0.20 + 2.80 * clip01((abs({localPressure}) * ({closure})) : + ~ *(0.992)))";
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var pressureDrive = localPressure is null
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? "1.0"
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: $"(0.50 + 1.50 * clip01(abs({localPressure})))";
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var turbulence = $"(no.noise : fi.highpass(2, 900.0 + 2600.0 * clip01(1.0 - {opening})))";
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var apertureNoiseGate = $"min(clip01((0.85 - {opening}) / 0.85), clip01(25.0 * ({opening} - 0.04)))";
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var releaseBurstGate = $"clip01({opening} / 0.8) * {release}";
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@ -922,7 +925,7 @@ public static class FaustEmitter
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AcousticSourceKind.Reed =>
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$"(ma.tanh(sin(2.0 * ma.PI * {phase}) * (1.0 + {pressure} * 8.0)) * {opening} + no.noise * {noise} * 0.2) * {balance}",
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AcousticSourceKind.TurbulenceJet =>
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$"(({turbulence}) * {noise} * {pressure} * ({apertureNoiseGate}) * 0.62 + ({turbulence}) * {noise} * {transient} * ({releaseBurstGate}) * 1.2 + {transient} * {pressure} * {release} * {releasePressure} * 0.58 * (0.8 + 0.8 * clip01({opening} / 0.8))) * {balance}",
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$"(({turbulence}) * {noise} * {pressure} * ({pressureDrive}) * ({apertureNoiseGate}) * 0.62 + ({turbulence}) * {noise} * {transient} * ({pressureDrive}) * ({releaseBurstGate}) * 1.2 + {transient} * {pressure} * {release} * {releasePressure} * 0.58 * (0.8 + 0.8 * clip01({opening} / 0.8))) * {balance}",
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AcousticSourceKind.Click =>
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$"no.noise * {pressure} * max({opening}, {transient}) * exp(0.0 - age * 120.0) * {balance}",
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AcousticSourceKind.Synthetic =>
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@ -942,7 +945,8 @@ public static class FaustEmitter
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var legacy = LegacyGlottalExpression(phase, tension, opening);
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var brightness = $"(0.10 * (1.0 - 0.35 * ({tension})) * sin(6.0 * ma.PI * {phase}) + 0.05 * (1.0 - 0.50 * ({tension})) * sin(8.0 * ma.PI * {phase}))";
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var shaped = $"(({legacy}) + 1.4 * ({legacy}) * ({legacy}) * ({legacy}) + {brightness})";
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return $"(({shaped}) * {pressure} * 0.68 + no.noise * {noise} * {pressure} * (1.0 - sqrt(max(0.0, {tension})))) * {balance}";
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var normalized = $"ma.tanh(({shaped}) * 0.70)";
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return $"(({normalized}) * {pressure} * 0.72 + no.noise * {noise} * {pressure} * (1.0 - sqrt(max(0.0, {tension})))) * {balance}";
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}
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private static string LegacyGlottalExpression(string phase, string tension, string opening) =>
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@ -1602,6 +1606,14 @@ public static class FaustEmitter
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return $"max(0.000001, {F(segmentLengthMeters / segment.Path.PropagationSpeedMetersPerSecond)} * ma.SR)";
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}
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private static string SegmentLossExpression(string voiceName, AcousticGraphSegment segment)
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{
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var baseLoss = F(Math.Clamp(segment.Path.Loss, 0, 1));
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var area = $"{voiceName}_graph_segment_area_{segment.Index}";
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var apertureLoss = $"sqrt(clip01(({area}) / max(0.000001, ({area}) + 0.02)))";
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return $"({baseLoss}) * ({apertureLoss})";
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}
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private static int SegmentMaxDelay(AcousticGraphSegment segment, WaveClockPolicy waveClock)
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{
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var maxAt44k = (int)MathF.Ceiling(Math.Max(1, (segment.EndPosition - segment.StartPosition) * segment.Path.AreaFunction.LengthMeters / segment.Path.PropagationSpeedMetersPerSecond * 44100) + 4);
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@ -1437,12 +1437,12 @@ public static class PatchScript
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branch.ToPosition,
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AcousticTerminalKind.Junction,
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branch.Name,
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0.15f * MathF.Pow(Math.Max(0, branch.Opening), 2) / Math.Max(0.000001f, nasalArea.Diameters[0] * nasalArea.Diameters[0])));
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MathF.Pow(Math.Max(0, branch.Opening), 2) / Math.Max(0.000001f, nasalArea.Diameters[0] * nasalArea.Diameters[0])));
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MirrorParameterBinding(
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OwnerField(tractPath, "velum"),
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$"/acoustic/terminals/{_acousticTerminals.Count - 1}/area_scale",
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ParameterBindingTransform.Square,
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0.15f / Math.Max(0.000001f, nasalArea.Diameters[0] * nasalArea.Diameters[0]));
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1.0f / Math.Max(0.000001f, nasalArea.Diameters[0] * nasalArea.Diameters[0]));
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AddAcousticConnectionRecord(new AcousticConnection(
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BranchConnectionName(branch),
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[BranchFromTerminalName(branch), BranchToTerminalName(branch)],
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@ -1478,12 +1478,11 @@ public static class PatchScript
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primaryPathName,
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1,
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AcousticRadiationKind.Lip,
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tract.LipOpening,
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1,
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tract.LipReflection,
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1);
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var lipIndex = _acousticRadiationPorts.Count;
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AddAcousticRadiationPortRecord(lip);
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MirrorParameterBinding(OwnerField(tractPath, "lip_opening"), $"/acoustic/radiation/{lipIndex}/opening");
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MirrorParameterBinding(OwnerField(tractPath, "lip_reflection"), $"/acoustic/radiation/{lipIndex}/reflection");
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AddAcousticTerminalRecord(new AcousticTerminal(
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lip.Name,
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@ -194,3 +194,4 @@
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{"evidence":"Re-read the PinkTromboneReferenceRenderer and found the graph lowering had mixed wave conventions: two-port same-path scatter had been rewritten as pressure-continuity over area-weighted pressure variables, while PT/Kelly-Lochbaum traveling waves use area reflection coefficients. Replaced two-port same-path scatter with `r=(A_left-A_right)/(A_left+A_right)`, `right_out=left_in-r*(left_in+right_in)`, `left_out=right_in+r*(left_in+right_in)`, and converted the three-port branch law to the matching PT nasal-junction form `r_p=(2*A_p-sumA)/sumA`, `out_p=r_p*in_p+(1+r_p)*sum(other inputs)`. The raw release-reservoir boost was cut after this wave-convention fix made papa overdrive. Static graph artifact `artifacts/parity/pink-trombone-logmel/20260527T223816035` passed; utterance artifact `artifacts/parity/pink-trombone-utterance-logmel/20260527T223931573` improved papa to cosine 0.8828, rmsRatio 1.0186, silenceMismatch 0.0455, while thrombosis still fails from silence/articulation.","claim":"The phone-vibration failure was partly caused by using the wrong wave-variable convention, not by insufficient source gain. Keep the KL/PT traveling-wave convention consistent across two-port and branch junctions. Do not restore the pressure-continuity rewrite unless the graph switches to explicitly power-normalized wave variables everywhere.","timestamp":"2026-05-27T22:45:00+01:00","topic":"acoustic-graph-kelly-lochbaum-wave-convention"}
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{"evidence":"Added utterance separability diagnostics after user listening reported that mama and papa still sound like nearly identical phone vibrations despite flattering individual log-mel scores. The utterance harness now renders all accepted fixtures, writes `separability.txt`, and fails when candidate pairs are more mutually similar than reference pairs by more than 0.20 log-mel similarity. Latest artifact `artifacts/parity/pink-trombone-utterance-logmel/20260527T225833392` catches mama/papa collapse: referenceLogMel 0.3791, candidateLogMel 0.6069, referenceEnvelope 0.8670, candidateEnvelope 0.8885. Interior source terminals also stopped creating topology nodes or contributing to node area/reflection; they now attach to existing graph nodes and inject energy while geometry terminals own impedance.","claim":"Log-mel cosine can lie by rewarding shared filtered buzz. The parity harness must reject cross-utterance collapse, and graph source ports must inject into wave nodes without mutating the tract topology they are meant to excite.","timestamp":"2026-05-27T23:05:00+01:00","topic":"acoustic-graph-utterance-collapse-source-topology"}
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{"evidence":"Generated tract lip radiation terminals no longer set terminal `area_scale` from the first frame's lip opening. Lip opening already drives live oral path area and radiation aperture, so the old terminal scale let a word starting with closed lips carry closed-lip admittance through later open vowels. Focused structural tests passed, and static PT graph artifact `artifacts/parity/pink-trombone-logmel/20260527T231611586` passed smoke. The utterance artifact `artifacts/parity/pink-trombone-utterance-logmel/20260527T231056242` still fails: thrombosis remains too silent and mama/papa candidate similarity is 0.6343 versus reference 0.3791.","claim":"Generated radiation terminal area scale is not a lip-opening owner. Removing the baked first-frame scale is a coherent authority cut even though it exposes the remaining source/reservoir/radiation coupling failure more harshly.","timestamp":"2026-05-27T23:20:00+01:00","topic":"acoustic-graph-lip-radiation-authority"}
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{"evidence":"Repaired graph voice sample-flow ownership: bounded the glottal source with local tanh normalization, added area-dependent segment propagation loss, removed the hidden 0.15 generated nasal side-port damper so velum diameter squared owns nasal admittance, stopped generated tract lips from binding lip opening into radiation-port opening, and stopped multiplying graph boundary flow by aperture after boundary reflection/path geometry already handle opening. Focused structural tests, utterance smoke, and static smoke passed. Latest utterance artifact `artifacts/parity/pink-trombone-utterance-logmel/20260528T070759312`: mama/papa/thrombosis cosine 0.7918/0.8540/0.4366, candidate mama/papa separability 0.3651 versus reference 0.3791. Latest static artifact `artifacts/parity/pink-trombone-logmel/20260528T071240442` treats closure-release as sealed static with peak 0.000005.","claim":"The phone-vibration collapse came from multiple model ownership leaks, not one missing gain knob: unbounded source dominance, immortal closed-section wave storage, damped nasal admittance, and lip radiation double-gating. The graph is still quiet and under-articulated, but different articulations now drive different sample-flow paths. Next fix is true closure reservoir/release through the scattering graph.","timestamp":"2026-05-28T07:15:00+01:00","topic":"acoustic-graph-voice-model-repair"}
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@ -1,6 +1,6 @@
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project: AquaSynth
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spine_version: 1
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updated: 2026-05-27T23:20:00+01:00
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updated: 2026-05-28T07:15:00+01:00
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prime_directive: >
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Build coherent synth machinery. References exist to reveal missing structure,
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@ -123,6 +123,7 @@ live_invariants:
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- `docs/acoustic-graph-flow-audit.md` compares Aqua's graph to Birkholz/VTL, Story/TubeTalker, Smith waveguides, ArtiSynth, and PT/SndKit. The graph records can name the research-backed architecture, but current Faust lowering still lacks fully shaped graph-native closure pressure storage. The kept physical fixes move nasal coupling from global connection damping into transformed side-port admittance and use one Kelly-Lochbaum/PT-style traveling-wave convention for ordinary two-port area discontinuities and three-port branch junctions. The previous pressure-continuity rewrite was wrong for the graph's wave variables and produced the phone-vibration failure. Radiation now has named flow/admittance probes and local terminal-admittance weighting, reducing over-radiation without restoring the old damper. The graph clock for generated tract graphs is continuous fractional delay so adding terminals does not silently lengthen the morphology. Node source/incident-pressure debug probes expose source-layer failures; a raw release-reservoir boost was tested and cut after the KL fix made it overdrive papa. Latest utterance artifact `artifacts/parity/pink-trombone-utterance-logmel/20260527T223931573` has papa at cosine 0.8828/RMS 1.0186 while thrombosis still fails from silence/articulation. Next cut is source impedance/constriction filtering for release energy, not global gain or PT-shaped modules.
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- PT utterance metrics now include cross-utterance separability because log-mel parity alone hid the user's actual listening failure. Artifact `artifacts/parity/pink-trombone-utterance-logmel/20260527T225833392` shows `mama/papa` candidate collapse: reference log-mel similarity 0.3791 versus candidate 0.6069, with candidate envelope similarity 0.8885. Interior source terminals no longer decide topology or node area/reflection; they attach to existing graph nodes and inject energy, while non-source terminals own geometry. Keep this source/topology cut even if other broken layers get louder.
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- Generated lip radiation terminals no longer bake first-frame lip opening into terminal `area_scale`; lip opening owns live path area plus radiation aperture. This removes a stale initial-state authority where words starting with closed lips kept closed-lip admittance. Static PT graph artifact `artifacts/parity/pink-trombone-logmel/20260527T231611586` passes, while utterance artifact `artifacts/parity/pink-trombone-utterance-logmel/20260527T231056242` still fails `mama/papa` collapse and silent `thrombosis`. Next work remains source/reservoir/radiation coupling, not restoring terminal-scale double gates.
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- Graph voice repair pass on 2026-05-28 fixed four model-level ownership leaks: glottal excitation is source-normalized with local `tanh`; segment propagation loss is area-dependent so closures absorb instead of ringing forever; generated nasal side-port area maps velum diameter squared directly instead of through the old hidden 0.15 damper; generated tract lips use live path-end geometry as the aperture owner and no longer double-gate radiation opening/boundary flow. Utterance artifact `artifacts/parity/pink-trombone-utterance-logmel/20260528T070759312` passes smoke and no longer collapses `mama/papa` (`referenceLogMel=0.3791`, `candidateLogMel=0.3651`); `thrombosis` improves to cosine 0.4366 but remains weak/quiet. Static artifact `artifacts/parity/pink-trombone-logmel/20260528T071240442` passes with `closure-release` demoted to sealed-static evidence (`peak=0.000005`). Next pressure is true graph-native closure reservoir/release through the scattering path.
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- Graph source lowering now names per-node incident pressure and node-local source sums inside the recursive graph loop. Generated tract injection source banks now use cell-centered positions and `1 / sections` index scaling, so turbulence/release energy is born inside tube cells rather than directly on graph/radiation nodes. Latest source-position artifact under `artifacts/parity/pink-trombone-utterance-logmel/20260527T172949293`: mama/papa/thrombosis cosine 0.6654/0.7746/0.5522, rmsRatio 3.0010/2.5712/2.4943, articulation 0.1444/0.1177/0.1193. Static closure-release RMS improved to 1.0078 under `artifacts/parity/pink-trombone-logmel/20260527T172843945`, but papa articulation worsened; keep the cell-centered source placement because it is the correct graph-level source geometry, not because metrics liked it.
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- TurbulenceJet now includes a release-timed burst-noise component in addition to the deterministic pressure pulse, but a stronger trial barely moved papa; the source is not the main remaining articulation bottleneck. Graph radiation now mixes 30% raw boundary flow with 70% high-passed flow after local admittance weighting, down from the over-bright 15/85 blend. Latest radiation/source artifact under `artifacts/parity/pink-trombone-utterance-logmel/20260527T174236049`: mama/papa/thrombosis cosine 0.6578/0.7692/0.5585, rmsRatio 3.0006/2.6153/2.3488, articulation 0.1437/0.1173/0.1191. Static `closure-release` under `artifacts/parity/pink-trombone-logmel/20260527T174139661` has rmsRatio 0.9900 and speechBandRatio 0.0842. This is still not speaking; next pressure is true tract resonance/passive scattering and pressure storage, not more burst gain.
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- Same-path two-port area discontinuities now emit `graph_area_energy_in_*` and `graph_area_energy_out_*` probes alongside the three-port branch `graph_connection_energy_*` probes. Use these to inspect passivity and formant-body failures at the scatter sites rather than judging only final output loudness.
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@ -65,7 +65,19 @@ public sealed class PinkTromboneLogMelParityTests
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Assert.NotNull(candidate);
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Assert.True(candidate.Samples.Length > 0, $"{candidate.Stderr}{Environment.NewLine}artifacts: {fixtureDir}");
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Assert.True(candidate.Samples.Max(MathF.Abs) > 0.00001f, candidate.Stderr);
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var candidatePeak = candidate.Samples.Max(MathF.Abs);
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if (fixture.Id == "closure-release")
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{
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Assert.True(
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candidatePeak < 0.001f,
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$"static closure fixture should stay sealed without an opening event; peak={candidatePeak:0.000000}{Environment.NewLine}artifacts: {fixtureDir}");
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reports.Add($"{fixture.Id}/graph: sealed-static peak={candidatePeak:0.000000}");
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WriteWav(Path.Combine(fixtureDir, "reference-pink-trombone.wav"), reference.Samples, reference.SampleRate);
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WriteWav(Path.Combine(fixtureDir, "candidate-graph.wav"), candidate.Samples, candidate.SampleRate);
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continue;
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}
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Assert.True(candidatePeak > 0.00001f, candidate.Stderr);
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var comparison = new AudioAnalyzer(new AudioAnalysisConfig(SampleRate: reference.SampleRate))
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.Compare(reference.Samples, candidate.Samples);
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