[LAD] Re: Pitch estimation

Le Thu, 25 Apr 2024 11:45:20 +0200,
Fons Adriaensen <[email protected]> a écrit :

> Hello all,

Hello Fons,

> The basic method is to look at the autocorrelation
> of the signal. This is a measure of how similar a
> signal is to a time-shifted version of itself. It
> can be computed efficiently as the inverse FFT of
> the power spectrum.
<snip>
> This a test of the pitch detection algorithm used in
> zita-at1.
> 
> The X-axis is time in seconds, a new pitch estimate is
> made every 10.667 ms (512 samples at 48 kHz).
> 
> Vertically we have autocorrelation, the Y-axis is in
> samples. Red is positive, blue negative. The green dots
> are the detected pitch period, zero means unvoiced.
> The blue line on top is signal level in dB.

From the start of a note, do You know how long it takes, or how much
periods of the signal it takes, in order to get the pitch?

Best,
Dominique
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