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. 24, 2004
Filed:
Jan. 15, 2003
Onkyo Corporation, Neyagawa, JP;
Abstract
A low-pass filter ( ) includes a differential operation circuit ( ), a voltage-current conversion circuit ( ), and a capacitor (C ). The voltage-current conversion circuit ( ) and the capacitor (C ) form a filter circuit ( ), and therefore the low-pass filter can remove a high frequency component. The differential operation circuit ( ) outputs a differential signal (&phgr;C) for the difference between an analog signal (&phgr;A) and an output signal (&phgr;B). Therefore, with the differential operation circuit ( ), a necessary frequency band is not attenuated. The phase level of the output signal (&phgr;B) output from the low-pass filter ( ) can be substantially equal to that of the analog signal (&phgr;A) by the differential operation circuit ( ). Therefore, the low-pass filter have a higher attenuation ratio for a high frequency component.