Precision gain balance of two video sources for a single display

Details Precision gain balance of two video sources for a single display Precision gain balance of two video sources for a single display

1976-09-22

1979-02-20

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358174, 358184, H04N 522

Patent

active

041410416

ABSTRACT:
Two video signals are precisely gain balanced so that one video signal may be inserted, unnoticeably, into a display derived from the first of the two video signals. To this end, a strobe is generated as the inset video signal is initiated. Both the inset video and the display video signals are sampled at the time said strobe is generated. A difference signal is derived from both samples and the gain of the inset video channel is adjusted in accord with the magnitude of that difference signal in a manner so as to minimize that magnitude.

REFERENCES:
patent: 3673324 (1972-06-01), Ito et al.

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