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P4: multi-band FramedDetector (per-band twin res, sens-scaled GAIN, min-combine); tt_base 61.40%; min-combine wrong (soothe2 uses additive accumulator 0x5407c8)

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Matiq
2026-08-20 10:41:24 +03:00
parent 0cdc57972c
commit 5c939583f5
5 changed files with 79 additions and 64 deletions
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dsp/framed_model.hpp
+19 -16
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@@ -3,34 +3,37 @@
#include <complex>
#include <vector>
struct DetectorBand {
float fc; // band center freq (Hz)
float q; // resonance Q
float sens; // XML sens (dB); internal sens_stored = sens * 2.054
};
// FramedDetector — C++ port of framed_render.py (Phase 5 pilot, mean=0.175 dB).
// Per-frame per-bin mask:
// res[f] = |2B(z)/A(z)| (twin resonance, detkernel::twin)
// am = 2|X_k|/wsum (per-bin input amplitude, smoothed attack/release)
// xv = log10(am / res)
// C = G_FIT*LUT(xv) + W_FIT*warp(f)^A_FIT
// gain = max(1-C, eps) * res^(rp0*Q^drp)
// Multi-band: each active band contributes gain_k = (1-C_k)*res_k^rp,
// final mask = min over bands (max suppression).
// res_k[f] = |2B(z)/A(z)| (twin resonance, sens-scaled GAIN)
// am = 2|X_k|/wsum (smoothed per-bin amplitude)
// xv_k = log10(am / res_k)
// C_k = G_FIT*LUT(xv_k) + W_FIT*warp(f)^A_FIT
// gain_k = max(1-C_k, eps) * res_k^(rp0*Q_k^drp)
class FramedDetector {
public:
FramedDetector(size_t nfft, float sample_rate);
~FramedDetector();
// fc = band center freq, q = resonance Q (>=1). Precomputes res[] + warp[].
void setParams(float fc, float q);
void setParams(const std::vector<DetectorBand>& bands);
// spectrum = forward FFT of one windowed frame (nfft/2+1 bins used).
// mask output = per-bin complex gain (nfft entries, mirror applied).
void processFrame(const std::complex<double>* spectrum, float* mask);
private:
size_t nfft_;
float sample_rate_;
float fc_;
float q_;
double wsum_;
std::vector<float> res_; // per-bin |2B/A|
std::vector<float> warp_; // per-bin warp tilt
std::vector<float> am_; // smoothed per-bin amplitude state
bool inited_;
std::vector<DetectorBand> bands_;
std::vector<std::vector<float>> res_; // per band, per bin |2B/A|
std::vector<float> warp_; // per-bin warp tilt
std::vector<float> am_; // smoothed per-bin amplitude
std::vector<float> rp_; // per-band res power
};