Sound: To Pitch (cc)...

A command that creates a Pitch object from every selected Sound object.

Purpose

to perform a pitch analysis based on a cross-correlation method.

Algorithm

The algorithm performs an acoustic periodicity detection on the basis of a forward cross-correlation analysis.

Settings

Time step (s) (standard value: 0.0)
the measurement interval (frame duration), in seconds. If you supply 0, Praat will use a time step of 0.25 / (pitch floor), e.g. 0.00333333 seconds if the pitch floor is 75 Hz; in this example, Praat computes 300 pitch values per second.
Pitch floor (Hz) (standard value: 75 Hz)
candidates below this frequency will not be recruited. This parameter determines the length of the analysis window: it will be 1 longest period long, i.e., if the pitch floor is 75 Hz, the window will be 1/75 = 0.01333333 seconds long.

Note that if you set the time step to zero, the analysis windows for consecutive measurements will overlap appreciably: Praat will always compute 4 pitch values within one window length, i.e., the degree of oversampling is 4.

The other settings are the same as for Sound: To Pitch (ac)....

Usage

The preferred method for speech is Sound: To Pitch.... The command described here is mainly for experimenting, or for applications where you need short time windows.

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© ppgb, September 16, 2003