Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-02-26
1983-09-06
Buczinski, S. C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358118, 455304, 455305, H04N 716, H04K 100
Patent
active
044032528
ABSTRACT:
The present invention provides a method and apparatus for scrambling and unscrambling television signals to prevent reception of acceptable signals by an unauthorized television receiver while maintaining the television signal recoverable by an authorized receiver. The present invention can also be used for reducing the necessary carrier signal power of a television transmitter.
A transmitter (12) passes a television signal through at least one linear filter (30, 32 and 34) of the type that produces multiple time delayed signals of differing time delays.
A receiver (14) receives the multiple time delayed signals from the transmitter and passes them through at least one linear filter (64, 66 and 68) to add the signals together so that one signal representative of the original is reinforced, allowing acceptable reception by an authorized viewer.
In one arrangement, the linear filters are SAW devices. In another arrangement, the linear filters are of a type employing charge coupled devices and in yet another arrangement, the linear filters are of digital types. In yet another arrangement, high frequency linear filters are of a ferromagnetic type. Different scrambling codes are achieved.
REFERENCES:
patent: 2972008 (1961-02-01), Ridenour et al.
patent: 3737785 (1973-06-01), Korpel
patent: 4002825 (1977-01-01), Lewis
patent: 4060833 (1977-11-01), Onyshkevych
patent: 4100496 (1978-07-01), Akiyoshi et al.
NASA Tech. Briefs, vol. 3, No. 1, MSC-16843, 1979.
Hartmann Clinton S.
Ragan Lawrence H.
Buczinski S. C.
R F Monolithics, Inc.
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