Error control apparatus for a digital video signal processing sy

Details Error control apparatus for a digital video signal processing sy Error control apparatus for a digital video signal processing sy

1992-08-20

1993-12-07

Cain, David C.

Cryptography

Key management

Having particular key generator

380 10, 380 17, 380 14, H04N 7167

Patent

active

052689611

ABSTRACT:
In a system for coding and decoding a digital television signal, a signal representing residual image information is transformed into plural subband signals representing vertical and horizontal frequencies, and quantized. To mitigate the effects of transmission channel errors, the quantized subband signals are scrambled by line shuffling before being data compressed prior to transmission. Inverse operations including decoding, line re-shuffling, dequantization and subband synthesis occur at a receiver.

REFERENCES:
patent: 4608456 (1986-08-01), Paik et al.
patent: 4613901 (1986-09-01), Gilhousen et al.
patent: 4663659 (1987-05-01), Blatter
patent: 5010405 (1991-04-01), Schreiber et al.
patent: 5091936 (1992-02-01), Katznelson et al.

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