Unauthorized observation preventing device for CATV system

Details Unauthorized observation preventing device for CATV system Unauthorized observation preventing device for CATV system

1982-08-03

1985-10-29

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 86, 358122, H04N 716, H04K 100

Patent

active

045503419

ABSTRACT:
In a cable television system of the type wherein a cable television signal including free and restricted television channels is subjected to selective frequency conversion at individual terminal units to obtain a desired one of the channels for observation, a signal detector is provided for detecting the presence or absence of a polling signal from the central facility and the frequency converter is either disabled or adjusted for reception of a free channel if no polling signal is received.

REFERENCES:
patent: 3886302 (1975-05-01), Kosco
patent: 3899633 (1975-08-01), Sorenson et al.
patent: 4081831 (1978-03-01), Tang et al.
patent: 4215366 (1980-07-01), Davidson
patent: 4313132 (1982-01-01), Doles et al.
patent: 4317215 (1982-02-01), Tabata et al.
patent: 4347604 (1982-08-01), Saito et al.
patent: 4430669 (1984-02-01), Cheung
patent: 4454538 (1984-06-01), Toriumi
patent: 4455570 (1984-06-01), Saeki et al.

Affiliated with

Also associated with

Rating

Unauthorized observation preventing device for CATV system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Unauthorized observation preventing device for CATV system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Unauthorized observation preventing device for CATV system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-730792