Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-03-23
1987-06-16
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358141, H04N 514
Patent
active
046739815
ABSTRACT:
A technique for handling video signals so as to permit such signals to be satisfactorily displayed on video display devices, such as TV receivers or monitors, but to prevent such signals from being satisfactorily recorded by video recording devices. In a particular embodiment thereof the video frame time base is altered in a selected manner, as by lengthening or shortening the time bases of successive video frames, or successive groups of video frames. The alterations thereof can be in discrete steps and be performed cyclically so that during each overall cyclical time period the cumulative error is zero.
REFERENCES:
patent: 4488176 (1984-12-01), Bond et al.
Bove, Jr. Victor M.
Lippman Andrew B.
Wiesner Jerome B.
Groody James J.
Massachusetts Institute of Technology
O'Connell Robert F.
Parker Michael D.
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