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:
Jun. 16, 1998
Filed:
Sep. 05, 1995
Janos Kovacs, North Andover, MA (US);
Ronald Kroesen, Harvard, MA (US);
Philip Quinlan, Castletroy, IE;
Analog Devices, Inc., Norwood, MA (US);
Abstract
A read system for implementing PR4 and higher order PRML signals includes: a continuous time programmable filter, for receiving a read signal representative of a binary signal from a storage medium and for shaping the read signal into a PR4 shaped read signal; an analog finite impulse response (AFIR) filter, responsive to the continuous time programmable filter, for sampling and forming the PR4 shaped read signal into a PR4 shaped multilevel read signal; an analog to digital converter, responsive to the AFIR filter, for converting the PR4 shaped multilevel read signal from analog to digital; a data sequence filter, responsive to the analog to digital converter, for transforming the PR4 shaped multilevel digital read signal to a predetermined order PRML signal; and a Viterbi detector, responsive to the data sequence filter, for detecting the binary signal from the predetermined order PRML signal.