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GPT5-high pass 2
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src/ext/vqt_kernel.c
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src/ext/vqt_kernel.c
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#include "kiss_fftr.h"
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// Generate logarithmically spaced center frequencies for musical notes
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// Keeps equal-tempered semitone spacing exact (2^(1/12)) without scaling the ladder.
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// If the last bin slightly exceeds maxFreq due to floating-point error, adjust the
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// base frequency minimally so that the last bin matches maxFreq exactly.
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// Keeps equal-tempered semitone spacing exact (2^(1/12)) without any scaling.
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// Uses minFreq as the musical base and ignores maxFreq for placement.
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void VQT_GenerateCenterFrequencies(float* frequencies, int numBins, float minFreq, float maxFreq)
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{
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const double step = pow(2.0, 1.0 / 12.0); // semitone ratio
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const double stepsToTop = (double)(numBins - 1) / 12.0; // octaves to the top bin
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// Compute the ideal top frequency using high precision
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double base = (double)minFreq;
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double idealTop = base * pow(2.0, stepsToTop);
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// Allow a tiny tolerance for FP error before correcting the base
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const double eps = 1e-7; // relative tolerance
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if (idealTop > (double)maxFreq * (1.0 + eps))
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{
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// Adjust base so that the top bin lands exactly at maxFreq
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base = (double)maxFreq / pow(2.0, stepsToTop);
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}
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// Fill frequencies using exact semitone spacing from the (possibly adjusted) base
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(void)maxFreq; // base is authoritative; maxFreq is not used to scale bins
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const double base = (double)minFreq;
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for (int i = 0; i < numBins; i++)
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{
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double f = base * pow(2.0, (double)i / 12.0);
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frequencies[i] = (float)f;
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frequencies[i] = (float)(base * pow(2.0, (double)i / 12.0));
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}
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}
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