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:
Dec. 03, 2002
Filed:
Jun. 13, 2001
Shigetoshi Nakao, Tokyo, JP;
Toshihiko Hamasaki, Yokohama, JP;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A method and apparatus for improving an S/N ratio in a digital-to-analog conversion of a PDM signal are provided. A digital-to-analog conversion system comprises an S/N ratio improving section. The S/N ratio improving section has a signal component extractor which extracts a signal component included in the PDM signal, and outputs a digitally filtered output signal. The digitally filtered output signal has a second full scale smaller than a first full scale of the PDM signal. The S/N ratio improving section also comprises a full-scale matching unit which matches the second full scale of the digitally filtered output signal with a third full scale of digital-to-analog conversion.