Patent ID: 7103538
Filing Date: 2006-09-05
Classification: G10L

Abstract:
1. A system for code excited linear prediction coding of speech signals comprising: a fixed code book with an embedded adaptive code book that is configurable to select excitation vector parameters, wherein the fixed code book includes both fixed codes and adaptive codes; an adaptive code book that is configurable to select long term processing excitation vector parameters; and a code book update system that is configurable to update the fixed code book with the embedded adaptive code book based on the long term processing excitation vector parameters; wherein the system is configurable to determine whether the long term processing excitation vector parameters from the adaptive code book are suitable for coding of the speech signals, and if suitable, the system is configurable to use the long term processing excitation vector parameters from the adaptive code book for coding of the speech signals, and if not suitable, the system is configurable to use long term processing excitation vector parameters from the fixed code book with the embedded adaptive code book for coding of the speech signals; wherein adaptive codes of the adaptive codebook have a different pitch lag search range than the adaptive codes of the fixed codebook.