System for inserting a test signal in a video image scanning lin

Details System for inserting a test signal in a video image scanning lin System for inserting a test signal in a video image scanning lin

1988-09-22

1990-01-02

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 10, 358 74, 358243, H04N 1704

Patent

active

048917001

ABSTRACT:
A television receiver includes a source of test signals for controlling parameters such as picture tube cut-off level and drive level. The test signals are inserted individually during visible scanning lines along the upper edge of the display screen, one test signal line per field, only when the brightness of a displayed picture exceeds a given level so as to mask the presence of the test signal. The test signal insertion process is disabled for low picture brightness conditions.

REFERENCES:
patent: 3659044 (1972-04-01), Olson
patent: 4069500 (1978-01-01), Hurst
patent: 4200882 (1980-04-01), Janssen
patent: 4633321 (1986-12-01), Tallant, II
patent: 4694350 (1987-09-01), Hinn

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