Method of providing sound privacy system compatible with mono an

Details Method of providing sound privacy system compatible with mono an Method of providing sound privacy system compatible with mono an

1989-02-02

1990-09-11

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 6, 358 86, 358143, 358144, 455 6, H04N 716, H04N 7167

Patent

active

049568620

ABSTRACT:
In order to provide secure access to the audio portion of a television signal, the audio portion of a TV signal is modulated at a frequency that is offset from the standard carrier frequency. In the embodiment disclosed herein, the audio portion of the TV signal is modulated with a nonstandard 4.75 Mhz carrier that is offset from the standard 4.5 Mhz carrier. In order that a standard TV receiver cannot receive the offset audio signal, the TV signal further contains an unmodulated carrier signal at 4.5 Mhz to "blank" unauthorized reception.

REFERENCES:
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patent: 3202758 (1965-08-01), Brownstein
patent: 4215366 (1980-07-01), Davidson
patent: 4266243 (1981-05-01), Shutterly
patent: 4402010 (1983-08-01), Vogelman
patent: 4555730 (1985-11-01), Briggs
patent: 4628358 (1986-12-01), Robbins
patent: 4646150 (1987-02-01), Robbins et al.
patent: 4821097 (1989-04-01), Robbins

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