Brightness clamping apparatus for TV receiver with multiple inpu

Details Brightness clamping apparatus for TV receiver with multiple inpu Brightness clamping apparatus for TV receiver with multiple inpu

1986-06-12

1987-05-05

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358168, 358181, H04N 5262

Patent

active

046636684

ABSTRACT:
A television receiver is arranged to selectively display images from several input signal sources--such as pix-in-pix, teletext, computer graphics, besides displaying pictures from the normal off-the-air television signal. In accordance with this invention, clamping circuits are provided for establishing a constant black image reference level for all the input signals.

REFERENCES:
patent: 3526710 (1970-09-01), Martin
patent: 4562475 (1985-12-01), Levine
U.S. patent application, Ser. No. 780,014, filed 9/25/85, Filliman et al.

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