Patent ID: 6108372
Filing Date: 2000-08-22
Classification: H04L

Abstract:
In a variable rate communications system, a sub-system for determining, at a receiver, the data rate of a received data frame, comprising:a processor for generating a signal indicating the most likely rate of said received data frame in accordance with a predetermined hypothesis test;a decoder for receiving said most likely rate signal and for decoding said received data frame into a decoded frame of bits at said most likely rate;a data check element for receiving said decoded bits, generating error metrics characterizing said decoded bits, and generating a quality indication based on said error metrics for said decoded bits;a vocoder for receiving said decoded bits and processing said decoded bits to provide speech to a user upon generation of a positive quality indication; andwherein upon generation of a negative quality indication, said processor further causes said decoder to perform additional decoding of said received data frame in accordance with at least one rate other than said most likely rate.