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:
Jun. 07, 2005
Filed:
Jan. 16, 2001
Yoshiteru Hashimoto, Tokyo, JP;
Yoshiteru Hashimoto, Tokyo, JP;
Vertex Standard Co., Ltd., Tokyo, JP;
Abstract
In a bandwidth-limiting apparatus, control is performed of the oscillation frequencies of each of three local oscillators of three intermediate-frequency circuits, and the passband is limited by adjusting the width of and shifting the IF, the intermediate frequency at the last stage being converted by a frequency conversion means to a low frequency suitable for processing, which is then bandwidth limited by a filter function of a digital signal processor. Control of each passband is performed in linked fashion by control stored in a microcomputer circuit, and the sharp shape factor of the digital signal processor is effectively used to eliminate noise from the deviation passband. Because noise is eliminated before the detection stage, there is no cause for the intrusion of wraparound noise, thereby eliminating the necessity to perform excessive bandwidth limiting.