Method of and apparatus for modifying a video signal to inhibit

Details Method of and apparatus for modifying a video signal to inhibit Method of and apparatus for modifying a video signal to inhibit

1981-10-08

1984-12-11

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358140, 358319, 358119, 360 331, 360 371, H04N 538

Patent

active

044881762

ABSTRACT:
Video signal lines are added to or omitted from the ends of individual fields of a video signal to produce a modified video signal whose field length varies at a slow rate. The modified video signal can be broadcast and received by conventional television equipment, normal television reception and viewing being not noticeably affected by the variable field length. However, recording of the modified video signal is inhibited because the field length is not constant. The modified video signal is produced by directly modifying the scanning of televising equipment, or by storing the lines of the video signal in a store and reading them in a controlled manner therefrom. A decoder, for producing a constant field length video signal from the modified video signal, is also disclosed.

REFERENCES:
patent: 3963865 (1976-06-01), Songer
patent: 4100575 (1978-07-01), Morio et al.
patent: 4276565 (1981-06-01), Dalton et al.
patent: 4292653 (1981-09-01), Bock et al.
patent: 4390898 (1983-06-01), Bond et al.

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