Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1991-09-09
1993-04-27
Sniezek, Andrew L.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
358339, H04N 578
Patent
active
052067688
ABSTRACT:
An Apparatus and method of writing a video signal in a memory is provided in an apparatus of the type in which an analog video signal read from a magnetic recording medium is converted into digital image data that is then written in the memory, wherein the operation of a circuit which generates a timing clock signal for converting the video signal into the digital image data and for writing the digital image data in the memory is synchronized at every horizontal synchronizing signal separated from the video signal by application of a trigger signal. The apparatus and method includes enabling a control of a time constant of an automatic frequency control circuit, to which the horizontal synchronizing signal separated from the video signal is applied, for generating a trigger signal synchronized to the horizontal synchronizing signal and applying this trigger signal to the circuit which generates the timing clock signal, and making the time constant relatively large in the vicinity of a vertical synchronizing signal of the video signal.
REFERENCES:
patent: 4214262 (1980-07-01), Mizukami
patent: 4853914 (1989-08-01), Okano et al.
patent: 4977462 (1990-12-01), Takanashi et al.
Fuji Photo Film Co. , Ltd.
Sniezek Andrew L.
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