Method and apparatus for descrambling a television signal

Details Method and apparatus for descrambling a television signal Method and apparatus for descrambling a television signal

1989-03-31

1990-05-22

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 17, H04N 7167

Patent

active

049283090

ABSTRACT:
A baseband television signal having a video portion with a suppressed horizontal sync pulse is descrambled by using a variable attenuator. The attenuator shifts the level of predetermined portions of the signal to restore the suppressed horizontal sync pulse to a normal unsuppressed level with respect to the rest of the signal. A reference voltage is derived from a blanking level potential and sync level potential of the signal, and is equal to the zero carrier level of the video portion of the signal. The reference voltage is utilized to maintain the level of the restored sync pulse at a proper value.

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"Standard Baseband (Audio/Video) Interface between NTSC Television Receiving Devices and Peripheral Devices", originally published as EIA Interim Standard IS-15, Jan. 4, 1989, Consumer Electronics Group, Electronic Industries Association, Washington, D.C.

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