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. 31, 1992
Filed:
Jun. 11, 1990
Silvio A Cardero, Tucson, AZ (US);
Brian G Goodman, Tucson, AZ (US);
Julian Lewkowicz, Tucson, AZ (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A data detection circuit employing either amplitude or transition location techniques to adjust a detection threshold for following shifts in baseline of the signal being detected. In the amplitude version, the midway amplitude value between a detected succession of positive and negative peaks adjusts the detection threshold such that threshold adjustment occurs in one detection period and is used in the immediately-following detection period. In the transition-position detection, the relative location in time of successive transitions, represented by samples of the transition of a read signal, are integrated and averaged for providing detection which tracks baseline shifts. In all cases, shifting of detection threshold is always immediately adjacent the usage of a detection threshold which continually follows a shifting DC baseline of the input signal. A tracking detection threshold follows baseline shift of a distorted read signal detects zero axis crossing of the analog signal for generating a NRZI digital waveform.