Field service switch for a television receiver

Details Field service switch for a television receiver Field service switch for a television receiver

1991-05-03

1992-05-19

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 10, 358139, 358160, H04N 544, H04N 1700

Patent

active

051153165

ABSTRACT:
A television receiver provides a noise-free set up signal by automatically selecting an unused baseband video input terminal, or an unused pair of SVIDEO input terminals. Selection of the unused terminals provides a D.C. level to the luminance path, and allows the horizontal oscillator to free-run. In addition to selecting an unused video input terminal, the subject apparatus automatically increases the brightness level a few steps to simulate a 7.5 IRE flat field (commonly known as set up). The above-listed steps may be performed manually by a service technician, for television receivers not incorporating apparatus for automatically performing the steps.

REFERENCES:
patent: 3959811 (1976-05-01), Shanley
patent: 4626892 (1986-12-01), Northrup
patent: 4769703 (1988-09-01), Osborne
patent: 4907082 (1990-03-01), Richards
patent: 4914516 (1990-04-01), Duffield

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