Sync suppression scrambling and descrambling of television signa

Details Sync suppression scrambling and descrambling of television signa Sync suppression scrambling and descrambling of television signa

1988-07-29

1990-05-01

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 19, H04N 7167

Patent

active

049225324

ABSTRACT:
The quality of sound delivered to a subscriber viewing a channel which has been scrambled using sync suppression scrambling, particularly when the program is being transmitted with stereo sound, is improved by processing the aural component of the TV signal at the head end of the system prior to transmission over the cable or other communication link to the subscribers. The amplitude of the aural signal is reduced so as to compensate for the increase in amplitude which occurs when the composite TV signal is descrambled by restoring the amplitude of the suppressed synchronizing signals thereof. No changes are required in the existing subscriber equipment and the subscribers may continue to use the descramblers supplied to them without any modification thereof. Noises, such as are perceived as a "buzz" like sound, and loss of stereo separation of the aural signal upon descrambling are avoided.

REFERENCES:
patent: 3530232 (1970-09-01), Reiter et al.
patent: 4466017 (1984-08-01), Banker
patent: 4471380 (1984-09-01), Mobley
patent: 4639777 (1987-01-01), Mori

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