Method and apparatus for secure audio channel transmission in a

Details Method and apparatus for secure audio channel transmission in a Method and apparatus for secure audio channel transmission in a

1980-04-28

1986-04-29

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358144, H04N 7167, H04N 704

Patent

active

045860815

ABSTRACT:
A secure audio channel transmission system method and apparatus in which an FM signal is generated on an FM broadcast frequency, such as 107.5 megahertz, divided in frequency by 2 and distributed via a cable television system to subscribers equipped with frequency doubler circuits that reconstitute the FM signal for reception on a standard FM broadcast receiver. Unauthorized reception is prevented by the use of the non-standard, frequency-divided signal which is not receivable by standard broadcast channel television or FM receivers.

REFERENCES:
patent: 3936594 (1976-02-01), Schubin et al.
patent: 4245245 (1981-01-01), Matsumoto et al.

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