Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1990-09-11
1993-06-29
Shaw, Dale M.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 30, 381 31, 381 38, G10L 500, G10L 302, G10L 702
Patent
active
052241670
ABSTRACT:
A speech coding apparatus coupled to a transmission channel includes m (m is an integer greater than 1) coders, m decoders and m or (m-1) error correcting coders. The apparatus also includes an evaluation unit which evaluates a quality of each of reproduced speech signals from the input speech signal and the reproduced speech signals and which outputs an evaluated quality of each of the reproduced speech signals. The quality of each of the reproduced speech signals is evaluated in a state having no transmission error. A decision unit identifies one of the m coders which provides the reproduced speech signal having a smallest distortion on the basis of the evaluated quality of each of the reproduced speech signals, a current error rate of the transmission channel and error correcting abilities of the error correcting coders, and generates a coder identification number representative of a selected one of the m coders. An output part outputs a multiplexed transmission signal including the coded speech signal generated by the one of the m coders identified by the decision unit and the error correcting code generated by a corresponding one of the m error correcting coders.
REFERENCES:
patent: 4516259 (1985-05-01), Yato et al.
patent: 4802171 (1989-01-01), Rasky
patent: 4811396 (1989-03-01), Yatsuzuka
patent: 4831636 (1989-05-01), Taniguchi et al.
Quantization Procedures for the Excitation in CELP Coders by Peter Kroon and Bishnu Atal (1987, vol. 3 of 4, IEEE) Acoustics, Speech, and Signal Processing.
Amano Fumio
Ohta Yasuji
Sasama Akira
Tanaka Yoshinori
Taniguchi Tomohiko
Fujitsu Limited
Shaw Dale M.
Tung Kee M.
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