Apparatus for encoding and decoding information
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United States of America Patent
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Jul 2, 1985
Issued Date -
N/A
app pub date -
Jun 11, 1982
filing date -
Feb 20, 1979
priority date (Note) -
Expired
status (Latency Note)
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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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