Adaptive keyed synchronous detector

Details Adaptive keyed synchronous detector Adaptive keyed synchronous detector

1989-12-29

1991-05-21

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358158, H04N 544, H04N 504

Patent

active

050180150

ABSTRACT:
A keyed type synchronization wave detecting circuit comprises a phase wave detector for synchronizing and wave detecting a composite video signal responsive to a signal for wave detection. A synchronizing signal generator provides a horizontal synchronizing signal controlled by the frequency of a horizontal synchronizing signal of the composite video signal. A keying pulse generator provides a keying pulse signal from the synchronizing signal of the synchronizing signal generator. A phase controller outputs a phase difference signal in accordance with the difference in phase between the signal for wave detection and a carrier of the composite video signal such that the phase difference approaches a predetermined level, the phase controller having a comparator for performing a keying outputting operation of the phase difference signal by the input of the keying pulse signal, and a filter for removing the high frequency component of the phase difference signal and forming a control signal. A lock detector controls the output of at least the keying pulse signal to the phase controller when it is detected that the signal for wave detection is phase-locked to the carrier. Means are provided for generating the signal for wave detection synchronized with the carrier based on the control signal.

REFERENCES:
patent: 4694327 (1987-09-01), Demmer et al.
patent: 4700217 (1987-10-01), Balaban et al.
patent: 4930003 (1990-05-01), Hosoya

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