Patent ID: 6119081
Filing Date: 2000-09-12
Classification: G10L

Abstract:
A pitch determining method for a low-delay multiband excitation vocoder, comprising the steps of:(a) obtaining a synthesized magnitude spectrum and a biasing value of the error amount with respect to respective pitch candidates in a predetermined pitch area from an input voice magnitude spectrum and obtaining the error amount .zeta.(T) with respect to the respective pitch candidates T;(b) obtaining a weighted function W(T) with respect to the respective pitch candidates;(c) obtaining a weighted error amount .zeta..sub.W (T) with respect to the respective pitch candidates T by multiplying the error amount .zeta.(T) obtained in the step (a) with the weighted function W(T) obtained in the step (b);(d) determining the candidate pitch having the minimum error amount in the weighted error amount .zeta..sub.W (T) with respect to the respective pitch candidates T obtained in the step (c) to be an estimated pitch; and(e) removing said minimum error amount without using a pitch tracking method.