Synchronizing arrangement for a picture display device

Details Synchronizing arrangement for a picture display device Synchronizing arrangement for a picture display device

1990-07-19

1992-11-03

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358158, H04N 504

Patent

active

051610116

ABSTRACT:
A synchronizing arrangement for a picture display device includes a synchronizing signal separating stage in which horizontal synchronizing pulses are recovered from a television signal applied to the synchronizing arrangement. In addition, the synchronizing arrangement includes a horizontal synchronizing circuit, more specifically a phase-locked loop, to which the horizontal synchronizing pulses are applied for the purpose of synchronization. When, switching criterion is present for a first presettable number of picture lines, the horizontal synchronizing circuit is switched to a fixed rated frequency. When the switching criterion is not satisfied anymore, the horizontal synchronizing circuit is switched back to synchronization by the horizontal synchronizing pulses after a second presettable number of picture lines.

REFERENCES:
patent: 4636860 (1987-01-01), Duijkers
patent: 4677484 (1987-06-01), Pitsch et al.
patent: 4729023 (1988-03-01), Srivastava
patent: 5038116 (1986-08-01), Motte 358158

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