Conditional access television sound

Details Conditional access television sound Conditional access television sound

2006-12-05

2006-12-05

Arani, Taghi T. (Department: 2131)

Cryptography

Video cryptography

Video electric signal modification

C280S208000, C280S209000, C280S210000, C280S238000, C725S031000, C725S032000, C348S423100, C348S436100

Reexamination Certificate

active

07146008

ABSTRACT:
A digitally encrypted audio signal may be transmitted with an analog television signal. Access to the analog television video signal may be controlled by using graphics overlay techniques. The use of digital encryption techniques on the audio channel prevents improper interception.

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