A command that creates a Pitch object from every selected Sound object.
to perform a pitch analysis based on a spectral compression model. The concept of this model is that each spectral component not only activates those elements of the central pitch processor that are most sensitive to the component's frequency, but also elements that have a lower harmonic relation with this component. Therefore, when a specific element of the central pitch processor is most sensitive at a frequency f0, it receives contributions from spectral components in the signal at integral multiples of f0.
The spectral compression consists of the summation of a sequence of harmonically compressed spectra. The abscissa of these spectra is compressed by an integral factor, the rank of the compression. The maximum of the resulting sum spectrum is the estimate of the pitch. Details of the algorithm can be found in Hermes (1988)
© djmw, April 2, 1997