Measure the degree of Periodicity

How can I define the degree of periodicity of voice speech signal?

Answer 1

[Wayne King]

You can use the cepstrum. There is a technique called "cepstral peak prominence" that is used to analyze voice quality. The basic idea being that the more periodic (better) voiced quality, the more prominent the cepstral peaks.

Answer 2

[Farideh Jalali]

I have used the autocorrelation technique and FFt for pitch detection.Is there any other techniques for measuring degree of periodicity in these methods(FFT and autocorrelation)?Do you know any references for cepstral peak prominence by matlab?

[Wayne King]

If you search the web, you will find many references for cepstral peak proimence.