Resisting the effects of channel noise in digital transmission o

Details Resisting the effects of channel noise in digital transmission o Resisting the effects of channel noise in digital transmission o

1987-06-05

1988-12-13

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

381 29, 358133, H04B 166

Patent

active

047916540

ABSTRACT:
A method for resisting the effects of channel noise in the digital transmission of information by means of the technique known as vector quantization, in which the codebook for binary index code assignment is generated by picking a vector quantized codeword with high probability and low perceptually-related distance from a required group of nearest neighbors, assigning that codeword and those neighbors binary index codes differing only in one bit, repeating the steps just outlined for assigned binary index codes to residual codewords until the lasts assignments must be made arbitrarily. Applications include transmission of speech by coded LPC parameters and transmission of image intensity or chrominance blocks for visual images. Such systems also make possible and are attractive for memory-efficient storage of such signals.

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