Apparatus for encoding and decoding information

Details Apparatus for encoding and decoding information Apparatus for encoding and decoding information

1982-06-11

1985-07-02

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358123, 358124, H04N 716, H04K 104

Patent

active

045271950

ABSTRACT:
Apparatus for encoding and decoding information. Multiple scrambling techniques are provided to prevent unauthorized reception of a television picture signal. A first mode of scrambling provides for shifting randomly occurring horizontal synchronization pulses within each field of video signal producing horizontal as well as vertical instability. Video line inversion of selected lines within a field comprises a second mode of scrambling of the signal. A third mode of scrambling provides for amplitude shifting the television signal during selected portions of the signal which contains luminance and chrominance information following a line synchronization pulse.

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