Mark Douglas Warne

US Patent:

54265410, Jun 20, 1995

Filed:

Mar 31, 1994

Appl. No.:

8/221321

Inventors:

Jonathan D. Coker - Rochester MN
Richard L. Galbraith - Rochester MN
Walter Hirt - Zurich, CH
David J. Stanek - Rochester MN
Mark D. Warne - Rochester MN

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11B 509

US Classification:

360 65

Abstract:

Apparatus and method for providing equalization adjustment for a filter are provided in a PRML data channel. A first predetermined test pattern is written. Relative error is measured in both magnitude and phase for predetermined frequencies. A relative magnitude ratio for the predetermined frequencies and a phase delay between the predetermined frequencies are identified. A tap set is generated having predefined frequency responses at a plurality of predefined discrete frequencies.