Patent ID: 6400731
Filing Date: 2002-06-04
Classification: H04B,H04L

Abstract:
A variable rate communication system comprising:a transmission device capable of selectively using one of a predetermined plurality of data rates for each frame determined in stages; and a reception device capable of receiving data transmitted by said plurality of data rates, wherein said transmission device comprises: data rate decision means decides a data rate used with the latest frame to one of data rates used with a frame immediately before and a different data rate from a data rate used with the frame immediately before by one stage; and encoding means for performing a predetermined encoding processing according to the data rate decided by said data rate decision means to a transmission data, and said reception device comprises: decoding means for performing a predetermined decoding processing according to said plurality of data rates to a reception data, respectively; narrowing means for narrowing candidates of the data rates used with a received latest frame to a part of said plurality of data rates based on a data rate at least used with a frame immediately before; judgment processing means for performing a predetermined judgment processing to judge a data rate used with said latest frame as valid data rates for narrowed data rates; and reception data selection means for selecting a reception data to which a decoding processing according to a data rate judged by said judgment processing means is performed by said decoding means as a valid reception data.