Coincidence circuit in a line synchronizing circuit arrangement

Details Coincidence circuit in a line synchronizing circuit arrangement Coincidence circuit in a line synchronizing circuit arrangement

1987-04-06

1990-08-14

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, 358158, H04N 504

Patent

active

049491784

ABSTRACT:
A coincidence circuit in a line synchronizing circuit arrangement for a picture display device. The coincidence circuit detects a coincidence state of an incoming line synchronizing signal which originates from a synchronizing signal separator, and a locally generated line signal which originates from a line oscillator. The coincidence circuit comprises a first coincidence detector which is operative during the field blanking interval and which comprises a source activated by the incoming line synchronizing signal for modifying the quantity of information which is stored in storage means. The line synchronizing signal is effectively inhibited in the coincidence state of the coincidence detector and is uninhibited in the non-coincidence state by the locally generated line signal. A second coincidence detector is operative during the field trace time and comprises a third source activated by the incoming line synchronizing signal for modifying the quantity of information which is stored in the storage means. The third source is enabled by the locally generated line signal in the coincidence state of the second coincidence detector, but is not enabled in the non-coincidence state.

REFERENCES:
patent: 4251833 (1981-02-01), Fernsler et al.

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