Pay television system utilizing multi-frequency passive filters

Details Pay television system utilizing multi-frequency passive filters Pay television system utilizing multi-frequency passive filters

1983-05-02

1986-11-18

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

333175, 333176, 333177, 455 30, H04K 102, H04N 7167, H03H 700

Patent

active

046239189

ABSTRACT:
Selected interference frequency signals are inserted into the video or RF signal at the transmitter for scrambling purposes, either singly or in pairs. At the receiving end the signals are decoded by use of filters matched to the transmitted signal. The system allows different scrambling for each pay program thereby increasing the security relative to the prior art single frequency system.

REFERENCES:
patent: 2348026 (1944-05-01), Peterson
patent: 2812433 (1957-11-01), Stolk
patent: 2905747 (1959-09-01), Kidd et al.
patent: 4074311 (1978-02-01), Tanner et al.
patent: 4097894 (1978-06-01), Tanner et al.
patent: 4099203 (1978-07-01), Garodnick et al.
patent: 4222067 (1980-09-01), Stern et al.
patent: 4409569 (1983-10-01), Potash
patent: 4453145 (1984-06-01), Schuster

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