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:
Apr. 25, 2000
Filed:
Apr. 06, 1998
James David Hughes, Boynton Beach, FL (US);
Gwilym Francis Luff, Cambridge, GB;
Motorola, Schaumburg, IL (US);
Abstract
A digital phase quantized frequency modulation (FM) detector (300) is for a communication receiver (100). A digital phase FM quantizer receives (310) I and Q signals (221, 222) derived from a received FM signal (119) and generates a coded position word (381) of width M bits at the beginning of each period of a sample clock (190) that identifies a sector location of a phasor representing the I and Q signals. A two's complement converter (400) converts the coded position word into a two's complement position word of width M bits. A differentiator (420) of width M bits generates a two's complement difference word which represents a change of a phase angle of the phasor in magnitude and direction during each period of the sample clock. A digital post detection filter filters consecutive two's complement difference words and generates therefrom a reconstructed digital demodulated signal (461).