Apparatus and method for generating test pattern of frequency co

Details Apparatus and method for generating test pattern of frequency co Apparatus and method for generating test pattern of frequency co

1992-04-03

1994-10-25

Harvey, Jack B.

Boots, shoes, and leggings

348178, 348189, G01M 1900, H04N 1700

Patent

active

053595432

ABSTRACT:
A test pattern generating apparatus and method of a frequency converter in a VCR, in which an on-screen display (OSD) circuit is used to output a test pattern instead of using an internal test pattern generator. The apparatus includes a microprocessor for outputting data, clock, and strobe signals to the OSD circuit in response to the operation of a test switch, video and audio muting circuits for muting the video and audio signals input signals to the frequency converter in response to the operation of the test switch, and the OSD circuit for generating the test pattern in accordance with an output of the microprocessor.

REFERENCES:
patent: 4500920 (1985-02-01), Ohyama et al.
patent: 4901147 (1990-02-01), Tajima
patent: 4974080 (1990-11-01), Fritchie et al.
patent: 5055928 (1991-10-01), Klingelhofer
patent: 5119200 (1992-06-01), Van Den Hombergh et al.

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