Time base correction circuit for a reproduced video signal from

Details Time base correction circuit for a reproduced video signal from Time base correction circuit for a reproduced video signal from

1989-06-27

1992-04-28

Envall, Jr., Roy N.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358314, 358320, 358325, 358336, 360 361, H04N 594, H04N 595

Patent

active

051092859

ABSTRACT:
In a video tape recorder and reproduction apparatus, a reproduction circuit includes a switcher for generating a composite video signal composed of a multiplicity of synchronization signals from two or more video heads, a synchronization signal separator for receiving the composite video signal and separating from the composite video signal the synchronization signal, an error detection circuit for receiving the synchronization signal, detecting an error in the synchronization signal from an average period of the synchronization signals, and outputting an error signal representative of the error, a hold circuit for receiving the error signal and generating a correction signal having a constant value for each average period of the synchronization signals, with a value of the correction signal being adjusted by being added with the error signal and holding the adjusted value for each successive period of the synchronization signals and a delay circuit for receiving the composite video signal and correcting the time base of the composite video signal in response to the correction signal.

REFERENCES:
patent: 4509078 (1985-04-01), Kuroda
patent: 4542417 (1985-09-01), Ohta
patent: 4623940 (1986-11-01), Matsumoto et al.

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