pitch calculation for speech signal

[EDIT: 20110903 03:38 - merge duplicate - WDR]

How to calculate pitch for voiced speech signals?

[Material from duplicate question]

1. I need how to calculate the pitch for voiced speech signal?
2. How to calculate the LP residual signal? The equation is

    e_n = x_n - sum_{k=1}^p a_k x_{n-k}.

[Walter Roberson]

That appears to be a theory question rather than a MATLAB question ?

[Daniel Shub]

@Walter, that is much nicer than just sticking a doit4me tag or something like it on the question.

Answer 1

[Daniel Shub]

This looks promising:

http://www.mathworks.com/matlabcentral/fileexchange/18497-speech-processing-tool

Answer 2

[Brian Hemmat]

To calculate the LP residual, use the lpc function in the Signal Processing Toolbox. To estimate the pitch of an audio signal, use the pitch function in Audio System Toolbox.

FYI: If you're thinking to use the residual to calculate the pitch, one of the algorithms available from the pitch function is the Summation of Residual Harmonics*, which does just that. So it could be a good place to start.

• Drugman, Thomas, and Abeer Alwan. "Joint Robust Voicing Detection and Pitch Estimation Based on Residual Harmonics." Proceedings of the Annual Conference of the International Speech Communication Association, INTERSPEECH. 2011, pp. 1973–1976.