Scrambling type method and apparatus for video transmission/rece

Details Scrambling type method and apparatus for video transmission/rece Scrambling type method and apparatus for video transmission/rece

1997-11-06

2000-03-07

Swann, Tod R

Cryptography

Video cryptography

Video electric signal modification

H04N 7167

Patent

active

06035044&

ABSTRACT:
A scrambling type video transmitting/receiving method feasible for digital television broadcasting and an apparatus therefor are disclosed. A video transmitter executes soft scrambling with an original video signal before compressing it and then sends the softly scrambled video signal. If a video receiver descrambles the scrambled data with a scramble decoder (descrambler), a subscriber having the receiver can enjoy complete video/audio data. However, when an unauthorized person lacking the scramble decoder decodes the descrambled data, the person is allowed to see only some patterns included in a picture. This will successfully encourage the unauthorized person to make subscription so as to enjoy the complete video/audio data.

REFERENCES:
patent: 5535275 (1996-07-01), Sugisaki et al.
patent: 5606612 (1997-02-01), Griffin et al.
patent: 5757973 (1998-05-01), Wilkinson et al.
English translation of Japanese Office Action dated Apr. 7, 1999 (Hei 11).

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