Double display mode for differential gain

Details Double display mode for differential gain Double display mode for differential gain

1988-09-12

1989-09-05

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 1702

Patent

active

048643866

ABSTRACT:
A double display mode for differential gain provides the capability of accurately determining the differential gain of a video system in response to a video test signal without using graticules on a display device. A detected chrominance peak level signal is displayed as a positive and a negative trace on the display device. An offset signal is added to the detected chrominance peak level signal to obtain an overlay on the display device of a first selected point of the traces, and then the offset signal is varied to obtain an overlay on the display device of a second selected point of the traces. The difference in values of the offset signal between the two selected points are used to determine the differential gain of the video system.

REFERENCES:
patent: 3534155 (1970-10-01), Rhodes
patent: 4354243 (1982-10-01), Ryan
patent: 4387551 (1986-05-01), Penney
patent: 4607288 (1986-08-01), Freyberger

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