Synchronizing circuit and sawtooth generator for the field defle

Details Synchronizing circuit and sawtooth generator for the field defle Synchronizing circuit and sawtooth generator for the field defle

1987-09-18

1988-05-31

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358150, 358159, H04N 504

Patent

active

047485051

ABSTRACT:
A synchronizing circuit and a sawtooth generator for the field deflection in a picture display device in which the sawtooth-shaped signal generated by the sawtooth generator has a retrace whose duration is switchable between a short and a longer duration. In a first use this switchover is used for eliminating the interlacing upon reception of interlaced signals, while the difference between the two durations is equal to half a line period and the switchover is effected at the picture frequency. In a second use a memory circuit is used which is an auxiliary circuit for the field synchronization, in which the shorter duration of the retrace period is switched over to in the absence of a plurality of successive incoming field synchronizing pulses, which plurality is not higher than a predetermined value.

REFERENCES:
patent: 3904823 (1975-09-01), Van Straaten
patent: 4383273 (1983-05-01), Lunn
patent: 4477749 (1984-10-01), Schmale
Matsubara; "Vertical Blanking Control Using Vertical Retrace Signal on Interlace Scan Drive"; IBM Technical Disclosure Bulletin; vol. 22, No. 3; Aug. 1979; pp. 1061-1062.

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