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fix: blend linear/log frequency mapping with blend=0.4

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Armin 2026-07-08 17:27:31 +02:00
commit ae3943aab0
1 changed files with 7 additions and 2 deletions
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@ -457,11 +457,16 @@ function drawSpectrum() {
const barMags = new Float32Array(NUM_BARS); const barMags = new Float32Array(NUM_BARS);
const minFreq = 20; const minFreq = 20;
const maxFreq = 19000; const maxFreq = 19000;
const blend = 0.4;
for (let b = 0; b < NUM_BARS; b++) { for (let b = 0; b < NUM_BARS; b++) {
const lowFreq = minFreq * Math.pow(maxFreq / minFreq, b / NUM_BARS); const lowFreq = minFreq * Math.pow(maxFreq / minFreq, b / NUM_BARS);
const highFreq = minFreq * Math.pow(maxFreq / minFreq, (b + 1) / NUM_BARS); const highFreq = minFreq * Math.pow(maxFreq / minFreq, (b + 1) / NUM_BARS);
const start = 1 + Math.floor(lowFreq * fftSize / sampleRate); const logStart = 1 + Math.floor(lowFreq * fftSize / sampleRate);
const end = 1 + Math.min(maxBin, Math.ceil(highFreq * fftSize / sampleRate)); const logEnd = 1 + Math.min(maxBin, Math.ceil(highFreq * fftSize / sampleRate));
const linStart = 1 + Math.floor(b * (maxBin - 1) / NUM_BARS);
const linEnd = 1 + Math.floor((b + 1) * (maxBin - 1) / NUM_BARS);
const start = Math.round(linStart + (logStart - linStart) * blend);
const end = Math.round(linEnd + (logEnd - linEnd) * blend);
let sum = 0; let sum = 0;
for (let j = start; j < end; j++) sum += mags[j]; for (let j = start; j < end; j++) sum += mags[j];
barMags[b] = sum / (end - start); barMags[b] = sum / (end - start);