Thread: Speech coding, detecting pitch

  1. #1
    Registered User subdene's Avatar
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    Jan 2002

    Speech coding, detecting pitch


    I have been trying to write a pitch detector within C++ for voiced speech. I currently get the sample speech, apply centre clipping for the entire speech data, and then calculate all the peaks. However, I am not sure whether I need to split the data into frames, and then apply a hamming window for example on each frame. Is this necessary? All of this is done within the time domain. Additionally, I wanted to use autocorrelation for determining the pitch period, and whether or not a pitch was a glottal pitch. All the examples of autocorrelation that I have seen use something called a lag, but they never explain how to compute this lag.

    So is it necessary to use frame and windowing? And
    How should I calculate the glottal period from the other peaks?

    Thanks in advance for any advice….. Sub.
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  2. #2
    and the hat of int overfl Salem's Avatar
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    Aug 2001
    The edge of the known universe
    You probably want "Fast Fourier Transform" as well, since it seems to me at least that all things in signal processing eventually need it.

  3. #3
    Registered User subdene's Avatar
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    Jan 2002
    Hi salem, finally managed to do pitch detection within the the time domain, with no ffts, and it identifies the glotal periods. I am so happy! Took me ages to do it as well
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