Procedure and decoder for decrypting a coded video signal

Details Procedure and decoder for decrypting a coded video signal Procedure and decoder for decrypting a coded video signal

1993-03-09

1994-08-30

Cain, David C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 10, 380 9, H04N 7167

Patent

active

053435281

ABSTRACT:
A procedure and a decoder for decrypting the encryption of a coded video signal at a given point of time, in which the decoder (1) is tuned to a given receive channel for a given point of time using the channel and timer system of a video recorder (2) electrically in conjunction with the decoder by means of a video connection (VIDEO). The decoder (1) is tuned to a home channel while in a stand-by, whereby it receives data from the home channel. The mode of the input (IN1) of the video connection of the decoder is detected, and if a video signal is detected to approach from the video connection (IN1), said video signal from the video connection (IN1) is coupled to the decryption circuits (7) of the decoder. When the entry of the video signal from the video connection (IN1) ends, a signal from the home channel is coupled to the decryption circuits (7) of the decoder.

REFERENCES:
patent: 4670904 (1987-06-01), Rumreich
patent: 4945563 (1990-07-01), Horton et al.
patent: 4995079 (1991-02-01), Kim

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