Technique for synchronous near-instantaneous coding

Details Technique for synchronous near-instantaneous coding Technique for synchronous near-instantaneous coding

1984-05-07

1986-04-15

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

370 99, 3701101, 332 11D, 375 25, H03M 738

Patent

active

045832374

ABSTRACT:
The present invention relates to a near-instantaneous companding coder wherein the peak a-c amplitude of an input signal is measured over a block of K samples. Each of the K samples is coded into an n-bit quantized sample code word based on a step size quantizing control signal determined from the measured peak a-c amplitude. The step size quantizing control signal, and other overhead information such as parity, sync, etc., are formed into a K-bit overhead word and transmitted serially by adding a separate bit of K-bit overhead word to each of the corresponding K n-bit quantized sample code words associated with an immediately prior block of K sample code words. At the remote decoder, the received K-bit overhead information word is stored and used to decode the next subsequent block of K received n-bit quantized sample code words.

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ICC 71, "An Adaptive Pulse Code Modulator for Speech", by R. M. Wilkinson, pp. 1-11-1-15.
ICC 73, "Adaptive Predictive Speech Coding Based on Pitch-Controlled . . . ", by A. H. Frei et al, pp. 46-12-46-16.
Electronics Letters, vol. 9(14), Jul. 12, 1973, "`Nearly Instantaneous`. . . ", by M. G. Croll et al, pp. 298-300.
The Radio and Electronic Engineer, vol. 49, Jan.-Dec., 1979, "An Amplitude-Controlled . . . ", by C. V. Chakravarthy, pp. 49-54.

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