Security system for pay-TV channel

Details Security system for pay-TV channel Security system for pay-TV channel

1977-01-17

1978-05-23

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358114, 358121, H04N 144

Patent

active

040914135

ABSTRACT:
A system for securing a pay-TV channel by coherently moving the RF components of the channel (with or without an encoding signal) beyond the AFC holding range of commercially available tuners. The system is comprised of means for mixing the channel carrier with a signal that is varied beyond that AFC holding range at a low rate between approximately 0.75 Hz and 1000 Hz. For greater security, an amplitude-modulated encoding signal is injected at an IF frequency that is between the audio subcarrier and the video subcarrier. The encoding signal is preferably a multiple of the line scanning frequency in order to interfere with both video and audio components. For decoding, a converter with adequate AFC holding range at the receiver of a subscriber is coupled to the receiver by a sharply tuned filter which traps the injected encoding signal.

REFERENCES:
patent: 3760097 (1973-09-01), Burroughs et al.
patent: 3859457 (1975-01-01), Kirk, Jr.
patent: 3996418 (1976-12-01), Murphy et al.
patent: 4034402 (1977-07-01), Brian

Affiliated with

Also associated with

Rating

Security system for pay-TV channel does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Security system for pay-TV channel, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Security system for pay-TV channel will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-567547