Reproducing apparatus for varying clock frequencies based upon a

Details Reproducing apparatus for varying clock frequencies based upon a Reproducing apparatus for varying clock frequencies based upon a

1997-05-16

1998-06-30

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

386 46, G11B 509

Patent

active

057742901

ABSTRACT:
The present invention is applicable to an apparatus which is arranged to reproduce a signal from a recording medium by using a plurality of heads each having a different azimuth angle and which includes a PLL circuit formed by an oscillator, a phase-difference detector for detecting a phase difference between an output clock signal of the oscillator and the reproduced signal, and a loop filter for receiving an output of the phase-difference detector. The present invention generates a clock signal phase-synchronized with the reproduced signal, by detecting an oscillation frequency error of the oscillator relative to a target frequency, integrating the oscillation frequency error together with an output of the loop filter to provide an integral output, adding the integral output to the output of the loop filter and inputting an addition result to the oscillator, and varying an operation for detecting the oscillation frequency error, according to the azimuth angle of each of the plurality of heads.

REFERENCES:
patent: 4030130 (1977-06-01), Smith
patent: 5255128 (1993-10-01), Inoue et al.
patent: 5321557 (1994-06-01), Shimotashiro et al.

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