公开(公告)号：AU2003287595A1

公开(公告)日：2004-06-03

申请号：AU2003287595

申请日：2003-11-06

Applicant: MOTOROLA INC

Inventor： MITTAL UDAR ,  ASHLEY JAMES P ,  CRUZ EDGARDO M

IPC: G10L19/00 ,  G10L19/12 ,  G10L25/90 ,  G10L25/93 ,  G10L19/08 ,  G10L19/10 ,  G10L19/14 ,  G10L19/06 ,  G10L11/04 ,  G10L11/06

Abstract: A CELP encoder is provided that optimizes excitation vector-related parameters in a more efficient manner than the encoders of the prior art. In one embodiment, a CELP encoder optimizes excitation vector-related parameters based on a computed correlation matrix, which matrix is in turn based on a filtered first excitation vector. The encoder then evaluates error minimization criteria based on at least in part on a target signal, which target signal is based on an input signal, and the correlation matrix and generates a excitation vector-related index in response to the error minimization criteria. In another embodiment, a CELP encoder is provided that is capable of jointly optimizing and/or sequentially optimizing multiple excitation vector-related parameters by reference to a joint search weighting factor, thereby invoking an optimal error minimization process.