Digital multiplex transmission system

Details Digital multiplex transmission system Digital multiplex transmission system

1994-04-05

1996-04-09

Cain, David C.

Cryptography

Key management

Having particular key generator

380 10, 380 20, 380 49, 370 79, H04N 7167

Patent

active

055069037

ABSTRACT:
A digital multiplex transmission system wherein the rate of convolution codes can be changed over in accordance with an object of a user without changing the transmission rate. A frame for transmitting system data, first preliminary data, second preliminary data, scramble control data, audio data, video data and Reed-Solomon codes is constructed by allocation of them such that a boundary between each adjacent region may make a vertical straight line. Data of such a frame are coded by convolution coding and then transmitted. When the transmission line is in a deteriorated condition, the rate of the convolution codes is reduced to increase the correcting faculty for the convolution codes. In contrast, when the transmission line is in a good condition, the rate of the convolution codes is increased to transmit a large amount of data.

REFERENCES:
patent: 4907233 (1990-03-01), Deutsch et al.
patent: 5400401 (1995-03-01), Wasilewski et al.
WPI Abstract Accession No: 89-306252/42, JP 1228327 A (Kojima).

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