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. 28, 2010
Filed:
Feb. 07, 2008
Jun Suzuki, Kumagaya, JP;
Jun Suzuki, Kumagaya, JP;
Sanyo Semiconductor Co., Ltd., Gunma, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
An FM receiver that is suitable for reducing a transmission bandwidth Wof a bandpass filter to remove adjacent-channel interference, and increasing Wto prevent audio distortion. A detection output signal Sis inputted to an HPFwhen a reception electric field strength signal Sindicates an intermediate or stronger electric field. In a weak electric field, an AC component signal S, which is extracted from an intermediate signal Sprior to detection and which has fewer high-pass noise components than S, is inputted to the HPF. A control circuitdetects a case as an adjacent-channel interference state when a large amount of high-pass components passes through the HPF, and reduces Wof an IFBPFin order to remove adjacent-channel interference. When a small amount of high-pass components is transmitted, Wis increased in order to minimize audio distortion.