measuring the fundamental fequency

how we can get the fundamental frequency of speech waveform in the Z transform?

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Answer 1

I think you're better off not just relying on the DFT (Z-transform on the unit circle) to estimate fundamental frequency. For a voiced speech segment, you'll see multiple peaks spaced at the fundamental frequency. For that reason, you're better off using the cepstrum which detects the periodicity in the Fourier transform, or a zero-crossing detector on a lowpass filtered and rectified form of the speech signal, or an autocorrelation-based technique to find the fundamental frequency.

I have modeled the speech production model( Excitation Glottis,Vocal tract and lip radiation)by three digital filters which are in the Z transform and the program is able to say /a/.I am be able to measure the frequency of each pole by number of oscillation divided by pitch period .Now .I am going to measure the variation of fundamental frequency in these waveforms.