Automatic contrast reduction circuit for a teletext or monitor o

Details Automatic contrast reduction circuit for a teletext or monitor o Automatic contrast reduction circuit for a teletext or monitor o

1983-09-30

1985-10-22

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358169, H04N 568

Patent

active

045492174

ABSTRACT:
In a TV receiver responsive to either conventional television video signals or an auxiliary video signal representative of alphanumeric text or graphic information, to prevent undesired "blooming" of the display due to high kinescope beam currents when the alphanumeric text or graphics are displayed on the screen of a kinescope, means are provided for reducing at least one amplitude characteristic of the auxiliary video signal, such as its peak-to-peak signal level (contrast) so as to reduce the kinescope beam current whenever the alphanumeric text or graphics are displayed.

REFERENCES:
patent: 4126884 (1978-11-01), Shanley, II
patent: 4167025 (1979-09-01), Willis
patent: 4253110 (1981-02-01), Harwood
patent: 4295166 (1981-10-01), Shanley, II
patent: 4319277 (1982-03-01), Nicholson et al.
patent: 4338623 (1982-07-01), Asmus et al.

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