Television signal data transmission system

Details Television signal data transmission system Television signal data transmission system

1985-03-15

1987-11-10

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 15, H04N 7167

Patent

active

047062843

ABSTRACT:
A television signal data transmission system comprises means for transmitting a television signal in which the phase of the RF carrier is modified during a periodically recurring interval by a SAW filter having a varying phase response between the video and audio carrier frequencies of the signal. The periodically recurring interval is modulated between a first width and a second smaller width respectively representing complementary logic states of a data bit. The first width of the width modulated interval preferably extends between two points respectively located within the non-viewable, overscan portions of the video signal immediately adjacent and on either side of a horizontal blanking interval of the television signal. The transmitted signal is received by a decoder which includes a phase modulation detector for detecting the width modulated intervals and a pulse width discriminator responsive thereto for deriving the data bits.

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patent: 3527877 (1970-09-01), Walker
patent: 3852519 (1974-12-01), Court
patent: 4295155 (1981-10-01), Jarger et al.
patent: 4353088 (1982-10-01), den Toonder et al.
patent: 4390898 (1983-06-01), Bond et al.
patent: 4467353 (1984-08-01), Citta et al.

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