Phase change dynamic scrambling

Details Phase change dynamic scrambling Phase change dynamic scrambling

1982-02-25

1984-05-08

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358114, 358123, H04N 716, H04K 102

Patent

active

044478283

ABSTRACT:
A means for coding and decoding video signals by the application of one of a plurality of available scrambling signals, which scrambling signals have a common frequency but differ in phase, includes means for comparing the brightness level during a predetermined time period of the video signal with the brightness level of the video signal over the succeeding predetermined time period. There are means for changing from one scrambling signal to another if the difference between brightness levels in successive predetermined time periods exceeds a given value.

REFERENCES:
patent: 4024575 (1977-05-01), Harney et al.
patent: 4216500 (1980-08-01), St. Louis
patent: 4313133 (1982-01-01), Fukushima

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