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:
Feb. 14, 2012
Filed:
Jul. 27, 2006
Applicant:
Akihiko Yoneya, Toyota, JP;
Inventor:
Akihiko Yoneya, Toyota, JP;
Assignee:
National University Corporation Nagoya Institute of Technology, Nagoya-shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 7/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a full digital amplifier for an audio amplifier or the like, it is possible to suppress the concentration of an electromagnetic noise emission spectrum at a specific frequency. A sampling period variation type digital filter is realized by varying the coefficient of a noise shaping filter for the delta-sigma modulator of the full digital amplifier depending on a sampling period. This allows the variation in the carrier frequency of the pulse width modulation.