H - Electricity – 04 – M
Patent
H - Electricity
04
M
354/47, 379/73
H04M 3/42 (2006.01) G10L 19/14 (2006.01) H03M 3/04 (2006.01) H03M 7/42 (2006.01)
Patent
CA 2020084
VOICE CODING/DECODING SYSTEM HAVING SELECTED CODERS AND ENTROPY CODERS ABSTRACT OF THE DISCLOSURE Disclosed is a voice coding/decoding system having a transmitting part for transmitting a coded signal of an input voice signal at a bit rate lower than a predetermined trans- mission bit rate and a receiving part for receiving and decoding the coded signal transmitted from the transmission part. To enable the coding and transmitting of an input voice signal in an optimum state without passing through a buffer memory and without having a negative influence on the coder, the transmit- ting part provides coders for coding the input voice signal and groups of entropy coders. The inputs of the entropy coders in each group are connected to the output of one of the plurality of coders. The transmitting part further provides an evaluation part for evaluating the characteristics of the outputs of the coders and the entropy coders. The evaluation part extracts those entropy coders having output bit rates lower than the transmission bit rate and extracts from the coders connected to the extracted entropy coders, a coder having the best output characteristic. Then, the evaluation part outputs a selecting signal indicating the combination of the selected coder and an entropy coder from the extracted entropy coders. The transmit- ting part further provides a selecting part for selecting, in response to the selecting signal, the codeword passed through the combination of the coder and the entropy coder to be transmitted.
Amano Fumio
Iseda Kohei
Kurihara Hideaki
Okazaki Koji
Satoh Kazumi
Fujitsu Limited
Mcfadden Fincham
LandOfFree
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