Dynamic magnetic information storage or retrieval – General processing of a digital signal – Address coding
Reexamination Certificate
2007-04-17
2007-04-17
Tzeng, Fred F. (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Address coding
Reexamination Certificate
active
11081346
ABSTRACT:
Reference patterns in accordance with the present invention can include variable frequency chevrons incorporated into a reference pattern on a printed media surface to improve servo demodulation. In an embodiment, the reference pattern can include one or more servo wedges having a preamble including digital information at a first frequency relative to the head when the rotatable medium is rotated at a spin speed. The servo wedges further include at least one field having a first set of a plurality of phase-bursts forming a positive chevron angle relative to the preamble and a second set of a plurality of phase-bursts forming a negative chevron angle relative to the preamble, wherein a frequency of the at least one field relative to the head when the rotatable medium is rotated at the spin speed varies between a first end of the media surface and a second end.
REFERENCES:
patent: 5107378 (1992-04-01), Cronch
patent: 5966264 (1999-10-01), Belser
patent: 6023389 (2000-02-01), Cunningham
patent: 6025970 (2000-02-01), Cheung
patent: 6411459 (2002-06-01), Belser
patent: 6445521 (2002-09-01), Schaff
patent: 6738205 (2004-05-01), Moran et al.
patent: 6754016 (2004-06-01), Messner et al.
patent: 7009802 (2006-03-01), Ehrlich
patent: 2002/0135927 (2002-09-01), Yatsu
patent: 2003/0161061 (2003-08-01), Lamberts
patent: 2005/0128620 (2005-06-01), Ehrlich et al.
patent: 2005/0128621 (2005-06-01), Ehrlich
patent: 2005/0128629 (2005-06-01), Ehrlich et al.
patent: 2005/0280916 (2005-12-01), Calfee et al.
patent: 2006/0001999 (2006-01-01), Ehrlich
patent: 2006/0007588 (2006-01-01), Oki
patent: 63025803 (1988-02-01), None
patent: 6121184 (1994-04-01), None
patent: 10334402 (1998-12-01), None
Fliesler & Meyer LLP
Matsushita Electric - Industrial Co., Ltd.
Tzeng Fred F.
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