The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 08, 1997
Filed:
Feb. 28, 1994
Jonathan D Coker, Rochester, MN (US);
Francois B Dolivo, Wadenswil, CH;
Richard L Galbraith, Rochester, MN (US);
Reto J Hermann, Buttikon, CH;
Walter Hirt, Zurich, CH;
Kevin Vannorsdel, San Jose, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method and apparatus are provided for maximum-likelihood data detection in a partial-response (PR) data channel including a head and disk assembly providing an analog signal coupled to an analog to digital converter (ADC) providing digital samples. A plurality of digital samples are received from the ADC. The received digital samples are applied to a selected first filter and a selected second filter. The first filtered digital samples are applied to a first data detector, and the second filtered digital samples are applied to a second data detector. A predetermined parameter is identified, and at least one of the first and second data detectors is selected responsive to the identified predetermined parameter.