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. 20, 2002
Filed:
Jul. 08, 1999
Applicant:
Inventor:
Takeshi Nakamura, Uji, JP;
Assignee:
Murata Manufacturing Co., Ltd., Kyoto, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04R 5/00 ; H03G 5/00 ;
U.S. Cl.
CPC ...
H04R 5/00 ; H03G 5/00 ;
Abstract
A 3D woofer drive circuit achieves miniaturization of a 3D sound system and reduces the cost thereof. The drive circuit includes two resistors arranged to synthesize an L-channel sound signal with an R-channel sound signal. Each end of a capacitor constituting part of a low pass filter and two fixed terminals of a variable resistor are respectively connected between a connection point of the resistors and a ground terminal which is a reference potential. A speaker terminal for the woofer is connected to a movable terminal of the variable resistor through a buffer amplifier.