Television picture and sound scrambler and method

Details Television picture and sound scrambler and method Television picture and sound scrambler and method

1984-10-15

1987-07-21

Buczinski, Stephen C.

Cryptography

Cryptanalysis

380 10, H04N 7167

Patent

active

046823590

ABSTRACT:
Television signal scrambling is effected by combining moderate level trap-attenuation of the visual carrier frequency with an injected fm-modulated interfering signal to effect, by adjustment of amplitude and fm-modulation levels, satisfactory picture scrambling and overpowering audio distortion in the user's television receiver.

REFERENCES:
patent: 3175033 (1965-10-01), Blonder et al.
patent: 3202758 (1965-08-01), Brownstein
patent: 3813482 (1974-03-01), Blonder
patent: 4074311 (1978-02-01), Tanner et al.
patent: 4085422 (1978-04-01), Niwata et al.
patent: 4095258 (1978-06-01), Sperber
patent: 4163252 (1979-06-01), Mistry et al.
patent: 4222067 (1980-09-01), Stern et al.
patent: 4268860 (1981-05-01), Blonder
patent: 4313133 (1982-01-01), Fukushima
patent: 4398214 (1983-08-01), Gargini

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