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:
Aug. 27, 2002
Filed:
Mar. 04, 1998
Kevin McLaughlin, Lake Worth, FL (US);
James Rodney Webster, Manitou Springs, CO (US);
Manbir Nag, Coral Springs, FL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A digital demodulator ( ) includes a differentiate and cross multiply stage ( ) and a plurality of filter/decimator stages ( and and ) that accept both multiple baud rates and multiple modulation deviation frequencies, and that provide a common frequency data stream at their respective outputs. One of said filter/decimator stages is coupled to a primary filter ( ) which is followed by a box filter ( ). The box filter ( ) improves the overall filter response and provides notches at a specified frequency (e.g., 4800 Hz) and its harmonics. Demodulator ( ) provides improved sensitivity without the need for any circuit trimming. The filter stages (e.g., and ) used in demodulator ( ) have been optimized to eliminate the need for costly multipliers.