Community antenna television reception controlling apparatus

Details Community antenna television reception controlling apparatus Community antenna television reception controlling apparatus

1985-12-09

1988-09-06

Buczinski, Stephen C.

Cryptography

Cryptanalysis

380 20, 455 1, 455 4, 358 86, H04N 7167, H04K 300, H04H 100

Patent

active

047698381

ABSTRACT:
A reception controlling apparatus for a CATV system in which jamming signals are added to the signals sent to each subscriber's terminal unit in such a manner as to accurately jam the designated nonpermitted channels without interfering with the permitted channels. A microcomputer receives data from a broadcast center indicating which subscribers are permitted to view which channels. A jamming signal is generated in a time-division manner and gated onto the lines to the individual subscribers under the control of the microcomputer. The jamming signal is produced by a VCO controlled by the microcomputer. The jamming signal is produced by a VCO controlled by the microcomputer while providing correction to its output frequency.

REFERENCES:
patent: 4091413 (1978-05-01), Herman
patent: 4222067 (1980-09-01), Stern et al.
patent: 4434436 (1984-02-01), Kleykamp et al.
patent: 4450481 (1984-05-01), Dickinson
patent: 4521809 (1985-06-01), Bingham
patent: 4550341 (1985-10-01), Naito
patent: 4598312 (1986-07-01), Geissler
patent: 4651204 (1987-03-01), Uemura
patent: 4682359 (1987-07-01), Mistry

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