Synchronization input for television receiver on-screen alphanum

Details Synchronization input for television receiver on-screen alphanum Synchronization input for television receiver on-screen alphanum

1983-03-30

1985-06-18

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358150, 3581921, H04N 510, H04N 506, H04N 550

Patent

active

045243875

ABSTRACT:
An arrangement for a television receiver is disclosed which facilitates the coupling of synchronization signals to an on-screen display integrated circuit of the receiver. The receiver includes sources of periodic vertical and horizontal rate pulses. A composite timing signal generator combines the vertical and horizontal rate pulses so as to form a composite timing signal in which the horizontal rate pulses are absent during the duration of each vertical rate pulse. The composite timing signal is coupled via a single conductor path to an input terminal of the on-screen display circuit. The composite timing signal can be readily decoded by a simple digital counter to provide separate horizontal and vertical rate pulses for the on-screen display circuit.

REFERENCES:
patent: 4263610 (1981-04-01), Shanley et al.
patent: 4485404 (1984-11-01), Tults
U.S. patent application Ser. No. 413,769, entitled A Digital AFT System Which is Activated During Vertical Retrace Intervals filed on Sep. 1, 1982 in the Name of Juri Tults and assigned to RCA Corporation.
EDN Magazine, Jan. 6, 1982, article by B. Albing, p. 207.
EDN Magazine, May 26, 1982, article by S. Bepko, p. 204.
EDN Magazine, Sep. 29, 1982, article by J. Gershfeld, p. 153.
Signal Processing Schematics of the RCA CTC 111 Series, Color Television Receiver Chassis, as published in RCA Television Service Data Bulletin No. C-3-S1 (1981) available from the RCA Consumer Electronics Division, Technical Publications, Indianapolis, Ind. (pp. 5 & 6 and 41-43).
Page 11 of "Digital Integrated Electronics", by H. Taub and D. Schilling, published by McGraw Hill in 1977.
Page 75 of "Basic Television Principles and Servicing", published by McGraw Hill in 1975.

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