Test method and apparatus of sequentially executing synchronous

Details Test method and apparatus of sequentially executing synchronous Test method and apparatus of sequentially executing synchronous

1995-03-30

1997-03-25

Peng, John K.

Television

Monitoring, testing, or measuring

Test signal generator

348181, 348179, 348194, 382218, H04N 1700

Patent

active

056149441

ABSTRACT:
In a video signal test, a sync signal test is first performed in which specification items of sync signals are measured. If the result is good, then a dot level test is performed using a dot discriminating pattern in which a dot level of the video signal changes between the maximum value and the minimum value for every dot. If the result is good, then a gradation test is finally performed using a gradation change pattern in which the gradation gradually changes for every horizontal line. In a case that the gradation test result is determined to be good, the functions of the video signal generator are finally judged to be good. On the other hand, if any one of the testing results is not good, the function test is ended at that stage without executing the next test.

REFERENCES:
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patent: 5036251 (1991-07-01), Lee
patent: 5251265 (1993-10-01), Dohle et al.
patent: 5459530 (1995-10-01), Andersson et al.

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