audio/noiz
2
0
Fork 0
mirror of https://codeberg.org/armin/noiz.git synced 2026-09-01 05:50:52 +02:00
Code Issues Projects Releases Packages Wiki Activity

fix: use logarithmic frequency mapping for analyzer bars

Browse source
This commit is contained in:
Armin 2026-07-08 17:25:38 +02:00
commit 31aff8672d
1 changed files with 6 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

8
index.html
View file

@ -455,9 +455,13 @@ function drawSpectrum() {
const maxBin = Math.min(binCount, Math.floor(19000 * fftSize / sampleRate)); const maxBin = Math.min(binCount, Math.floor(19000 * fftSize / sampleRate));
const NUM_BARS = 32; const NUM_BARS = 32;
const barMags = new Float32Array(NUM_BARS); const barMags = new Float32Array(NUM_BARS);
const minFreq = 20;
const maxFreq = 19000;
for (let b = 0; b < NUM_BARS; b++) { for (let b = 0; b < NUM_BARS; b++) {
const start = 1 + Math.floor(b * (maxBin - 1) / NUM_BARS); const lowFreq = minFreq * Math.pow(maxFreq / minFreq, b / NUM_BARS);
const end = 1 + Math.floor((b + 1) * (maxBin - 1) / NUM_BARS); const highFreq = minFreq * Math.pow(maxFreq / minFreq, (b + 1) / NUM_BARS);
const start = 1 + Math.floor(lowFreq * fftSize / sampleRate);
const end = 1 + Math.min(maxBin, Math.ceil(highFreq * fftSize / sampleRate));
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);