Method and circuit for deriving H and V synchronizing pulses fro

Details Method and circuit for deriving H and V synchronizing pulses fro Method and circuit for deriving H and V synchronizing pulses fro

1989-10-06

1991-04-30

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, H04N 506

Patent

active

050123408

ABSTRACT:
A tri-level HDTV synchronizing pulse signal is compared with first and second reference voltages to provide pulse signals respectively containing the positive and negative pulse of the tri-level signal. A blanking signal is also derived that provides blanking after each H synchronizing pulse for more than half a line duration. It is used in correlation with the separated positive pulses of the tri-level signal to produce H frequency synchronizing pulses. The blanking signal and also another pulse signal are generated by a four bit counter which is clocked by a clock signal having four times the H frequency and has the logic 1 voltage applied to that input of the counter where it will signify the binary number 4. These signals make possible the derivation of both a picture field synchronizing pulse of vertical scanning frequency V and a frame synchronizing signal of half that frequency, a pair of D-flipflops being used to provide these outputs. The first reference voltage may be ground potential if a slightly delayed output of the separated negative pulses is used to blank out the intervals between the separated positive pulses.

REFERENCES:
patent: 4639780 (1987-01-01), Willis
patent: 4864400 (1989-09-01), Kumada et al.

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