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Hi Friends
I am doing decimation on the voice signal ,after decimation the pitch of the voice has been changed.I suppose ,it shouldn't be changed,
Does anybody has any solution for improvement plz?
1 个评论
Daniel Shub
2012-4-28
Duplicate of http://www.mathworks.com/matlabcentral/answers/36838-pitch
回答（1 个）
Walter Roberson
2012-4-28
0 个投票
This is expected. If you have a waveform that used to play in N seconds, and now you play it in N/2 seconds (supposing here every second sample was removed), then you will have raised the pitch.
If you decimate the samples by a factor of M, then you also have to decimate the samples per second (i.e., frequency) by a factor of M in order to keep the same pitch.
1 个评论
Daniel Shub
2012-4-28
If you set the sample rate to be 1/M times the original sample rate you should be okay.
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2012-4-28
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