Microphone pitch detect

Core Library Questions

roger0402

in Core Library Questions • 2 years ago

Hello,

For a project i am trying to get different kinds of information out of an audio feed. With the minim GetLineIn example i was able to find the volume but now i am searching for the pitch of the incoming soundwave.

I want to use this pitch information to control some objects similar to this project http://vimeo.com/2242457 voice controlled pong.

So, is it posible to get the pitch out of an LineIn with minim? I can not find it in the GetlineIn example.

Thank you!

Replies(2)

oolong

Re: Microphone pitch detect

2 years ago

Hey, I believe you need to do something like this, from this old forum discussion:

fft.forward(in.left);
highest=0;
for(int n = 0; n < fft.specSize(); n++) {
// draw the line for frequency band n, scaling it by 4 so we can see it a bit better
line(n, height, n, height - fft.getBand(n)*4);
//find frequency with highest amplitude
if (fft.getBand(n)>fft.getBand(highest))
highest=n;
}

...straightforward enough, but not as simple as one might have hoped.

oolong

Re: Microphone pitch detect

2 years ago

Further to that, the 'highest' point identified by this is the number of the frequency band with the highest peak; to get Hz out, you also need to scale by 0.5*rate/specSize.

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