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Speech nonlinearities, modulations, and energy operators

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3 Author(s)
P. Maragos ; Div. of Appl. Sci., Harvard Univ., Cambridge, MA, USA ; T. F. Quatieri ; J. F. Kaiser

An AM-FM model for representing modulations in speech resonances is investigated. Specifically, an FM model is proposed for the time-varying formants whose amplitude varies as the envelope of an AM signal. To detect the modulations the energy operator Ψ(χ) and its discrete counterpart are applied. It is found that Ψ can approximately track the envelope of AM signals, the instantaneous frequency of FM signals, and the product of these two functions in the general case of AM-FM signals. Several experiments on the application of this AM-FM modeling to speech signals, band pass filtered via Gabor filters are reported

Published in:

Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference on

Date of Conference:

14-17 Apr 1991