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:
Jan. 15, 1991
Filed:
Aug. 31, 1989
Bradley F Jentz, Barrington, IL (US);
Francis R Yester, Arlington Heights, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A single substantially non-programmable fully integrated circuit for a digital frequency modulated discriminator is provided whereby frequency variations of a digitized frequency modulated information signal are linearly converted to amplitude variations. Matched pairs of data words from the digitized information signal are used to obtain a phase octant, one of eight equal sectors of the 360 degree spectrum. Further manipulations of the pairs of data words provide a coarse phase measurement, being some integral multiple of .pi./2, and a fine phase correction factor less than or equal to .pi./4 radians. The coarse phase measurement is combined with the fine phase correction factor. The sum is differentiated and demodulated, yielding the original information signal.