Title:
DEVICE FOR DETECTING HEAD POSITION OF MAGNETIC DISK DEVICE AND METHOD FOR RECORDING TRACKING SIGNAL OF MAGNETIC DISK
Document Type and Number:
Japanese Patent JPH05307840
Kind Code:
A
Abstract:
PURPOSE:To obtain accurate phase average signal even if jitter is generated, in data pulse by detecting the entry of the data pulse in a pulse discriminating window, selecting one output in an averaging circuit and making it the final output. CONSTITUTION:A plural number of reference clock is generated from a single master clock by a reference clock generating circuit 1 and outputted to a phase comparator circuit 3; the data pulse column and the reference clock are compared, and comparative output signals are outputted. The comparative output signals are averaged by the averaging circuit 5. A plural number of pulse discriminating windows are generated from the master clock by a circuit 2 for generating pulse discriminating windows and outputted to a detection circuit 4. What position the data pulse column is at in the plural pulse discriminating windows is detected by the circuit 4, and the detection signals are outputted. The signals by which a switching circuit 7 is shifted and driven from the plural detection signals based on a prescribed deciding method are outputted by a circuit 6 for selecting, discriminating and processing output. Any one of the plural averaging signals from the circuit 5 is selected and outputted by the circuit 7 based on the switching signals.
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Inventors:
ISHIOKA HIDEAKI
SEKO SATORU
SEKO SATORU
Application Number:
JP13429392A
Publication Date:
November 19, 1993
Filing Date:
April 27, 1992
Export Citation:
Assignee:
SONY CORP
International Classes:
G11B21/02; G11B19/14; G11B21/08; G11B21/10; (IPC1-7): G11B21/02; G11B19/14
Attorney, Agent or Firm:
Takahisa Sato