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fix(streamer): db-scaled spectrum so bars match frontend visibility

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devilreef 2026-04-30 19:18:03 +06:00
parent 9eaa16d818
commit 1c4c875c10
Signed by: devilreef
SSH key fingerprint: SHA256:UZisRr4iuXx+IhkbZnR655L2RWAT6o2rgbGv5F/6m3Y
2 changed files with 11 additions and 5 deletions
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7
streamer/tests/fft.test.ts
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@ -23,13 +23,14 @@ describe("SpectrumAnalyzer", () => {
});
});
it("a 1khz sine puts most energy in low bars (logarithmic binning)", () => {
it("a 200hz sine puts most energy in low bars (logarithmic binning)", () => {
const a = new SpectrumAnalyzer({ bars: 48, sampleRate: 48000 });
a.feed(sineFrame(1000));
for (let n = 0; n < 4; n++) a.feed(sineFrame(200));
const bars = a.bars();
const lowSum = bars.slice(0, 16).reduce((s, v) => s + v, 0);
const highSum = bars.slice(32).reduce((s, v) => s + v, 0);
expect(lowSum).toBeGreaterThan(highSum * 5);
expect(lowSum).toBeGreaterThan(0.1);
expect(lowSum).toBeGreaterThan(highSum + 0.1);
});
it("silence produces all-near-zero bars", () => {