Apparatus and method for phase correction of a clock signal by c

Details Apparatus and method for phase correction of a clock signal by c Apparatus and method for phase correction of a clock signal by c

1990-07-27

1993-03-09

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 361, G11B 509, H04N 578

Patent

active

051930358

ABSTRACT:
In a playback phase correction apparatus for a video recorder, a signal level of an input signal is compared with predetermined reference levels at times according to a playback clock signal. The apparatus operates to continuously detect whether the phase of the playback clock approaches or recedes from a point in time at which the eye pattern of the input signal is at a maximum value by comparing a count value obtained from the comparison results of the reference level counts from a previous cycle with those of the current cycle. Then, the apparatus controls a playback clock delay circuit on the basis of these count values so than an optimal count value is continuously maintained, thus ensuring that the timing of the playback clock is maintained in synchronization with the maximum eye pattern interval of the input signal.

REFERENCES:
patent: 4275466 (1981-06-01), Yamamoto
patent: 4399474 (1983-08-01), Coleman, Jr.
patent: 4581660 (1986-04-01), Schmidt

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