Method for protecting multi-pulse coders from fading and random

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system

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381 38, G10L 500

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active

050739409

ABSTRACT:
A low-overhead method of protecting multi-pulse speech coders from the effects of severe random or fading pattern bit errors combines a standard error correcting code (convolutional rate 1/2 coding and Viterbi trellis decoding) for protection in random errors with cyclic redundancy code (CRC) error detection for fading errors. Compensation for detected fading errors takes place within the speech coder. Protection is applied only to the perceptually significant bits in the transmitted frame.

REFERENCES:
patent: 4688224 (1987-08-01), Degan
patent: 4710960 (1987-12-01), Sato
patent: 4747104 (1988-05-01), Piret
B. S. Atal et al., "A New Model of LPC Excitation for Producing Natural-Sounding Speech at Low Bit Rates", Proc. of 1982 IEEE Int. Conf. on Acoustics, Speech and Signal Processing, May, 1982, pp. 614-617.
A. J. Viterbi et al., Principals of Digital Communication and Coding, McGraw Hill, 1979, pp. 301-315.
N. DalDegan et al., "Communications by Vocoder on a Mobile Satellite Fading Channel", Proc. of the IEEE Int. Conf. on Communications-1985 (ICC-85), Jun. 1985, pp. 771-775.
A. S. Tanenbaum, Computer Networks, Prentice Hall, 1981, pp. 128-132.

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