Patent ID: 6208961
Filing Date: 2001-03-27
Classification: G10L,H04L

Abstract:
A speech decoding method in a cellular radio network, comprising:receiving in a first base station, a speech signal transmitted over a radio path by a mobile station, the speech signal including information frames encoded using encoding parameters;forwarding said encoded information frames from said first base station to a speech decoder, the speech decoder being located further uplink and remote from said first base station, each of said information frames further carrying (i) a synchronization word in a first portion of the frame, and (ii) a synchronization check bit recurring at predetermined intervals within a remaining portion of the frame;receiving said information frames at said remote speech decoder;synchronizing said speech decoder with one of said received information frames using only a corresponding synchronizing word from the first portion of the frame;extracting said speech encoding parameters from said one received information frame;detecting errors in the remaining portion of the frame by monitoring for errors only in said recurring synchronization check bit, errors in the recurring synchronization check bit being indicative of errors in the remaining portion of the frame; andperforming one of:(i) storing the extracted speech encoding parameters in said remote speech decoder for updating speech parameters presently used for speech decoding, when no error is detected in said recurring synchronization check bit in said received information frame and(ii) preventing the storing of the extracted speech encoding parameters in said remote speech decoder, and preventing updating of speech encoding parameters presently used for said speech decoding, when an error is detected in said recurring synchronization check bit in said received information frame.