# Tag Info

### How to deal with low fundamental when using AMDF for pitch extraction?

This is what we call in the pitch-detection biz, the "octave problem". First of all, I would change the AMDF to ASDF. And I would not reduce the window size as the lag increases. (Also, I ...

### Integer multiples of fundamental period in sine wave

A $T$-periodic signal doesn't necessarily have a (sinusoidal) fundamental with period $T$. It never has one if the signal is also periodic with period $T/2$ or $T/3$ etc. (as in your example). But ...
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### How do I find the fundamental period of the given signal?

If your top equation is really $$x(t) = 2\cos\left(\frac 45 \pi t\right)\sin^2\left(\frac{16}{3} t\right)\tag{1}$$ You gonna have a hard time getting the fundamental period/frequency as the there ...
• 3,406
Accepted

### How to change speed of audio samples without changing pitch?

This question (about "time-scaling" audio) is closely related to pitch shifting, which is time-scaling combined with resampling. But changing the speed without changing pitch is only time-scaling, so ...

### Pitch perception - Why does our ear not directly detect the missing fundamental frequency?

Here is roughly how it works. A typically musical note is made out of harmonics and the fundamental. The fundamental is also the spacing between the harmonics. For 100 Hz fundamental you would get ...
• 45.6k
Accepted

### How to find the fundamental frequency of a discrete signal using partial autocorrelation?

Very simple: your sampling rate is 512Hz and your sample time is the inverse of this: about 1.953 ms. Multiply with 506 and you get the time length of the fundamental: 0.988s. So you have one beat ...
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### Pitch detection, YIN, pYIN

If there was some code outlining this, I would be interested I don't have the expertise to describe pYin precisely, but I can point you to the original code for that paper https://code.soundsoftware....
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Accepted

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1 vote

### YIN pitch estimation algoritm-simplified explanation

There is an older question about YIN where I am expressing lack of impressing. The only thing that is novel in YIN is the Cumulative mean normalized difference function (Step 3): what is plotted ...
1 vote

### What are F0 counters in Speech signals? What is represented by F0?

Check this source To begin with, let’s remember what the fundamental frequency is and in what tasks it may be needed. The fundamental frequency, which is also referred to as F0, is the ...
• 119
1 vote

### Octave: Finding the mean fundamental frequency given an audio signal

Your code appears to be looking for zero crossings of the rectified signal, which won’t work reliably if your signal has strong harmonics or overtones of the fundamental frequency within your filter’s ...
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