DATA DEMODULATION DEVICE, DATA DEMODULATION METHOD, REPRODUCTION DEVICE FOR MAGNETICALLY RECORDED DATA, AND PROGRAM

Title:

DATA DEMODULATION DEVICE, DATA DEMODULATION METHOD, REPRODUCTION DEVICE FOR MAGNETICALLY RECORDED DATA, AND PROGRAM

Document Type and Number:

WIPO Patent Application WO/2014/034600

Kind Code:

A1

Abstract:

The present invention provides a data demodulation device, a data demodulation method, a reproduction device for magnetically recorded data, and a program capable of suitably demodulating magnetic data with high accuracy even when there is a large fluctuation in traveling speed of a magnetically recording medium or a low recording accuracy for the recorded magnetic data. Specifically, the data demodulation device calculates a first absolute value that is a difference between a determination interval and a first reference interval assigned to a template or a second absolute value that is a difference between the determination interval and a second reference interval for each bit pattern and each bit of the bit pattern; multiplies the first absolute value in accordance with the difference between the second reference interval and the determination interval by a coefficient of a value that is larger than the first absolute value; calculates a total value that is calculated by a comparison calculation unit for each bit and represents the total for each bit pattern of the first absolute value and/or the second absolute value after multiplying the coefficient; and sets a bit pattern in which the calculated total value becomes minimum to a preliminary data string.

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Inventors:

NAKAJIMA SHIGEO (JP)
ISONO YOICHI (JP)
HIGASHI KATSUHISA (JP)

Application Number:

PCT/JP2013/072715

Publication Date:

March 06, 2014

Filing Date:

August 26, 2013

Export Citation:

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Assignee:

NIDEC SANKYO CORP (JP)

International Classes:

G11B20/10; G11B5/09; G11B20/14; H04L27/14

Foreign References:

JP2001135034A	2001-05-18
JP2002150717A	2002-05-24
JP2011070731A	2011-04-07
JP2013025852A	2013-02-04
JPS5850611A	1983-03-25

Other References: