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:
Nov. 07, 2006
Filed:
May. 01, 2003
Kazunobu Ohkuri, Kanagawa, JP;
Toshihiko Masuda, Tokyo, JP;
Kazunobu Ohkuri, Kanagawa, JP;
Toshihiko Masuda, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A class D power amplifier () switches a power supply voltage Vat high-speed in response to an input digital audio signal Pto power-amplify the digital audio signal P, and supplies a speaker () with the amplified signal. In the case of being incorporated in an AM receiver formed integrally with an AM tuner () for receiving AM broadcasts, the class D power amplifier () can reduces influence of reception interference with respect to the AM tuner (). As a result, it is possible to provide a power amplifier that can suppress unnecessary radiation to reduce reception interference with respect to the tuner, not by changing a carrier frequency, but by controlling the drive signal generation systems.