Patent ID: 6463406
Filing Date: 2002-10-08
Classification: G10L

Abstract:
A method of pitch period determination for digital speech, comprising the steps of:(a) providing input digital signals at a-first sampling rate having a first sampling period, and selecting a signal as a frame point; (b) determining crosscorrelations of pairs of intervals of length LI of said signals, each of said intervals including said frame point; (c) taking as an integer pitch period, P, the offset of the two intervals of the pair from step (b) with the largest crosscorrelation; (d) determining crosscorrelations of pairs of intervals of length L2 of said signals for intervals with ends adjacent the ends of said two intervals of step (c), wherein said L2 is at least P but less than L1; (e) determining a pitch period adjustment, q, by interpolating the crosscorrelations of step (d) where said q is less than said first sampling period, whereby a pitch period of P+q is determined.