Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1989-09-28
1992-02-25
Shaw, Dale M.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 30, 381 31, G10L 918
Patent
active
050919458
ABSTRACT:
A parameter communication arrangement where a parameter that is transmitted over a channel using m-bit codewords or labels is quantized before transmission as one of only p levels, where, significantly, p<k=2.sup.m. Since only p labels are needed to transmit the p levels, the unused k-p labels are advantageously available to provide redundancy. The receiver decodes the redundant labels in accordance with an error routine. An encoding table mapping from the p levels to p labels and a decoding table inverse mapping from the p labels to p levels are obtained using an optimization procedure to minimize the effect of channels errors. The optimization is based on the probability distribution for the p levels such that a relatively high proportion of the error protection made available by having redundant labels inures to the benefit of parameter levels which are more likely to be transmitted. The optimization procedure is a well known technique referred to as simulated annealing which is for the first time applied to source dependent channel coding.
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AT&T Bell Laboratories
Knepper David D.
Shaw Dale M.
Watland Ross T.
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