Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1989-11-24
1991-12-17
Kemeny, Emanuel S.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 38, G10L 500
Patent
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.
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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.
Koch Steven R.
Toy Raymond L.
Zinser Richard L.
Davis Jr. James C.
General Electric Company
Kemeny Emanuel S.
Snyder Marvin
Zale Lawrence P.
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