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:
Sep. 03, 2002
Filed:
Aug. 29, 2000
Applicant:
Inventors:
John M. Burgan, Palm Beach, FL (US);
James H. Carlquist, Austin, TX (US);
John R. Oakley, Austin, TX (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M 1/00 ;
U.S. Cl.
CPC ...
H04M 1/00 ;
Abstract
A digital tone generator ( ) includes a digital signal generator ( ) which generates a digital waveform data sequence which is representative of a tone having a predetermined waveform, and an adaptive duty cycle pulse-width modulator ( ) which is responsive to the digital waveform data sequence for generating an an adaptive duty cycle period characterized by a pulse-width modulated digital tone signal having a variable frequency and duty cycle which is generated by selecting a variable number of clock pulses of a predetermined reference clock ( ).