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. 25, 1986
Filed:
Aug. 01, 1983
Applicant:
Inventor:
Takeshi Matsumoto, Kanagawa, JP;
Assignee:
International Business Machines Corp. (IBM), Armonk, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360 51 ;
Abstract
A demodulator for reading a self-clocking frequency modulated code establishes time frames based on the reading process by which erroneous signal peaks can be detected. Signal peaks that fall outside of prescribed time frames are detected as errors, as are extra peaks occurring when only one is permitted. This demodulator is particularly useful in reading data from a magnetic stripe record on a bank passbook or credit card.