Patent ID: 6470470
Filing Date: 2002-10-22
Classification: H04L

Abstract:
A digital information transfer system, which comprises a transmitter and a receiver and an information transfer connection between said transmitter and receiver,said transmitter and receiver having means for processing of information and for transferring said information from said transmitter to said receiver using said information transfer connection, said transmitter having a channel encoder for processing the information, said information processing means having first dividing means for dividing the information into at least two parts, a first part and a second part, and that on said first part of said information, in said channel encoder, one of the following operations is performed: a) error correction coding for the correction of transfer errors occurring on the information transfer connection found at reception, b) error detection coding for the detection of transfer errors occurring on the information transfer connection found at reception, and a combination of a) and b), and further comprising:means for analyzing the quality of said information transfer connection and for yielding a response describing the quality, said transmitter arranged to adjust the ratio between said first information and said second information parts based upon the response received from said information transfer connection quality analysis means; wherein said transmitter comprises several speech encoders arranged to encode the incoming information at several different line speeds in order to form speech parameters, and several channel encoders arranged to add channel codes in connection with the speech parameters, the division of the information into said first part and second part based upon the response formed by said information transfer connection quality analyzing means arranged to be formed separately for each speech codec formed jointly by a speech encoder an a channel encoder;wherein said channel encoder is arranged to perform error correction coding to all of said first part for correction of transfer errors occurring on the information transfer connection found at reception;said channel encoder further comprises second dividing means for dividing said first part into two subdivisions, a first subdivision and a second subdivision; andsaid channel encoder comprises means for adding an error detection code in connection with the information of said first subdivision.