Scrambling and descrambling a high definition TV signal

Details Scrambling and descrambling a high definition TV signal Scrambling and descrambling a high definition TV signal

2007-09-25

2007-09-25

Smithers, Matthew B (Department: 2137)

Cryptography

Video cryptography

Video electric signal modification

C380S287000

Reexamination Certificate

active

10356327

ABSTRACT:
Method and apparatus for scrambling a high definition television signal to discourage unauthorized recording of same. While recording per se is not prevented, the resulting recorded signal is rendered unusable due to an induced “wobble” between the active video and the associated sync pulses. The scrambled television signal is readily viewable on a compliant high definition television set which descrambles the HDTV signal using an encoded indication of the amount of wobble accompanying the HDTV signal. Also provided is a special interface to prevent unauthorized persons from using the indication of the amount of wobble so as to defeat the scrambling. Also provided are method and apparatus for defeating the scrambling method and hence allowing recording of the scrambled video signal.

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