VOICE CODING/DECODING SYSTEM

摘要

Disclosed is a voice coding/decoding system having a transmitting part (1) for transmitting a coded signal of an input voice signal at a bit rate lower than a predetermined transmission bit rate and a receiving part (2) for receiving and decoding the coded signal transmitted from the transmission part. To enable the coding and transmitting input voice signal in an optimum state without passing through a buffer memory and without having a negative influence on the coder, the transmitting part (1) comprises coders (A1-An) for coding the input voice signal and groups (GA1-GAn) for entropy coders (A11-Anm). The inputs of the entropy coders (A11-Anm) in each group are connected to the output of one of the plurality of coders (A1-An). The transmitting part further comprises an evaluation part (3) for evaluating the characteristics of the outputs of the coders and the entropy coders to extract the entropy coders having output bit rates lower than the transmission bit rate and to extract, from the coders connected to the extracted entropy coders, a coder having the best output characteristic, to output a selecting signal indicating the combination of the selected coder and an entropy coder in the extracted entropy coders. The transmitting part further comprises a selecting part (4) for selecting, in response to the selecting signal, the codeword passed through the combination of the coder and the entropy coder to be transmitted.