Dream Sandbox · /dream/70-pitch-algo-compare
Pitch Compare
Three pitch detection algorithms running simultaneously — watch where they agree and where they diverge.
Autocorrelation
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0% conf
YIN
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0% conf
HPS
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0% conf
Algorithm notes
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ACFFirst ACF peak. Works well for pure tones; may have octave errors on complex signals.
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YINCumulative mean normalized difference with aperiodicity check. ~15% fewer octave errors than ACF.
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HPSHarmonic product spectrum (4 harmonics). Excellent for piano and strings; less reliable on sine tones.
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ConsensusGold dashed cursor when ≥2 algorithms agree within 1.5 semitones. A faint piano tone plays when the consensus note changes. Demo uses a sawtooth (rich harmonics — ideal for HPS).