Patent ID: 6026357
Filing Date: 2000-02-15
Classification: G10L

Abstract:
A method for performing pitch estimation comprising:receiving a speech frame comprising a plurality of speech samples;determining an order-two inverse filter for said speech frame using said plurality of speech samples;determining a dominant formant frequency from coefficients of the order-two inverse filter;calculating an autocorrelation function for said speech frame; andestimating a pitch period for said speech frame using said autocorrelation function, wherein said estimating includes using said dominant formant frequency to discriminate a dominant formant from pitch information in the autocorrelation function;wherein said determining an order-two inverse filter for said speech frame comprises:computing a plurality of candidate order-two inverse filters at a plurality of locations in said speech frame, wherein said computing generates a set of coefficients for each of said candidate order-two inverse filters;computing an energy value for each of said candidate order-two inverse filters, wherein said energy value is computed from said set of coefficients of the corresponding candidate order-two inverse filter;identifying a minimizing order-two inverse filter with a minimum energy value among said plurality of candidate order-two inverse filters as said order-two inverse filter.