Method for improving the speech quality in multi-pulse excited linear predictive coding

Abstract From the Canadian patent

A technique that reconciles the differences between the estimator and the filter of a mufti-pulse linear predictive voice encoder achieves a higher quality in the output speech. The technique simultaneously solves for the pulse amplitudes and pitch tap gain to minimize the estimator bias in the mufti-pulse excitation and thereby improves performance of the system. The increased SNR is accomplished by first modifying the pitch predictor such that the pitch synthesis filter accurately reflects the estimation procedure used to find the pitch tap gain and, second, improving the excitation analysis technique such that the pitch predictor tap gain and pulse amplitudes are solved for …