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. 12, 2008
Filed:
Sep. 02, 2002
Applicant:
Taiwa Okanobu, Tokyo, JP;
Inventor:
Taiwa Okanobu, Tokyo, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B 7/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a heterodyne receiver, the effect of an image interference signal that occurs in a case where a low intermediate frequency is used is alleviated. Circuits (I), (Q), (I), (Q), and () are provided to switch a heterodyne system between an upper heterodyne system and a lower heterodyne system. The switching circuits (I) to () switch the heterodyne system into one of the upper heterodyne system and the lower heterodyne system with less image interference on the basis of each reception frequency.