EP1746584A3

PRML based magnetic servo position demodulator

Abstract

Apparatuses and methods for detecting reference marks on magnetic data storage mediums are described herein. In one variation, the apparatus comprises a magnetic servo position demodulator operable to extract information from the magnetic data storage medium utilizing Partial Response/Maximum Likelihood (PRML) technique. Synchronization marks stored within the PRML channel is then detected utilizing a digital filter. For each of the detected synchronization mark, a further refined position of the synchronization mark can be determined utilizing a mathematical prediction model.

EP1746584A3, drawing sheet 1 — Sheet 1 of 1

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Citations
Document	Relation	Office	Category	Cited during	Relevant claims
EP0690442A2	Cites	European Patent Office (EPO)	Y	Search report	2-8,13-52
EP1600967A2	Cites	European Patent Office (EPO)	PX	Search report	21
US2003167438A1	Cites	United States of America	A	Search report	1,2,9-12
P.M. AZIZ, V. ANNAMPEDU: "Servo Signal Processing", 9 November 2004, CRC PRESS INC., BOCA RATON, FLORIDA, USA, XP002423129	Non-patent	–	–	Search report	–
ABRAMOVITCH D Y ED - AMERICAN AUTOMATIC CONTROL COUNCIL INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS: "Customizable coherent servo demodulation for disk drives", PROCEEDINGS OF THE 1998 AMERICAN CONTROL CONFERENCE. 1998 ACC. PHILADELPHIA, PA, JUNE 24 - 26, 1998, AMERICAN CONTROL CONFERENCE, NEW YORK, NY : IEEE, US, vol. VOL. 5 CONF. 16, 24 June 1998 (1998-06-24), pages 3043 - 3049, XP002117308, ISBN: 0-7803-4531-2	Non-patent	–	–	Search report	–

5 members in 3 offices

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Document	Office	Kind	Date
188199	United States of America	–	2005-07-22
18819905	United States of America	A	2005-07-22
18819905	United States of America	A	2005-07-22
188199	–	–	–
US20050188199	–	–	–

Members5

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Document	Office	Kind
EP1746584A2	European Patent Office (EPO)	A2	2007-01-24
US2007019316A1	United States of America	A1	2007-01-25
JP2007035248A	Japan	A	2007-02-08
EP1746584A3This record	European Patent Office (EPO)	A3	2007-05-02
US7362525B2	United States of America	B2	2008-04-22

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	Event	Code
2011-08-03	Application deemed to be withdrawnWithdrawn18D	18D
2011-07-01	Information on the status of an ep patent application or granted ep patentGrantedSTATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWNSTAA	STAA
2008-01-23	First examination report despatched17Q	17Q
2008-01-09	Designation fees paidAKX	AKX
2007-11-28	Request for examination filed17P	17P
2007-05-02	Designated contracting statesAK	AK
2007-05-02	Request for extension of the european patentAX	AX
2007-04-25	Information provided on ipc code assigned before grantRIC1	RIC1
2007-04-25	Information provided on ipc code assigned before grantRIC1	RIC1
2007-04-25	Information provided on ipc code assigned before grantRIC1	RIC1
2007-03-30	Search report despatchedORIGINAL CODE: 0009013PUAL	PUAL
2007-01-24	Designated contracting statesAK	AK
2007-01-24	Request for extension of the european patentAX	AX
2006-12-22	Public reference made under article 153(3) epc to a published international application that has entered the european phaseORIGINAL CODE: 0009012PUAI	PUAI

PRML based magnetic servo position demodulator

Abstract

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