Switching circuit for television receiver on-screen display

Details Switching circuit for television receiver on-screen display Switching circuit for television receiver on-screen display

1981-11-20

1983-10-25

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

358183, H04N 9535

Patent

active

044122446

ABSTRACT:
Auxiliary graphics information signals to be displayed by the kinescope of a television receiver during on-screen display intervals are applied to the kinescope via a video signal coupling path of the receiver by means of a gated transistor and a differentially controlled current steering switch which are controlled by graphics timing signals. A current source for the current steering switch supplies an operating current for the video path when normal video signals are to be displayed, operating current for the gated transistor when graphics signals of a color other than black are to be displayed, and operating current for blanking the video path to produce a black graphics display.

REFERENCES:
patent: 4363033 (1982-12-01), Lovely
Motorola TDA 3300 Video Processor Integrated Circuit: Diagram Showing External IC Connections (FIG. 6), and Two Sheets of the Schematic Circuit Diagram of the Integrated Circuit.
The Signal Processing Schematic of the RCA CTC-81B Color Television Receiver Chassis, as Published in RCA Television Service Data Bulletin No. C-9 (1975) Available from the RCA Consumer Electronics Division, Technical Publications, Indianapolis, Indiana (pp. 16-20 and 23,24).

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