A command that creates a Formant object from every selected Sound.
The settings for Time step (s), Maximum number of formants, Formant ceiling (Hz), Window length (s) and Pre emphasis from (Hz) are as in Sound: To Formant (burg).... The following settings determine aspects of the iterative formant frequency refinement.
First the sound is downsampled to twice the maximum formant frequency. Next, the LPC coefficients are determined by the autocorrelation method. Finally, in an iterative procedure as described by Lee (1988), the formant frequencies and bandwidths are refined by selective weighting of samples values.
© djmw, October 27, 2011