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:
Mar. 01, 1988
Filed:
Apr. 01, 1986
Applicant:
Inventor:
Richard A Baugh, Palo Alto, CA (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360 53 ; 360 46 ;
Abstract
Magnetic recording and reading apparatus and a method in which two modes of operation, read-after-write and read-only, for setting read signal amplitude qualification threshold are provided. In the read-after-write mode, a fixed amplitude qualification threshold is utilized, typically being fifty percent of the peak amplitude of a perfect dropout-free read signal. The read-only mode amplitude qualification threshold is derived from the average peak rectified read signal, and varies with it. The threshold is selected to provide that fraction of the average peak rectified read signal which gives the lowest acceptable dropout or error rate.