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:
May. 27, 2003
Filed:
May. 17, 1999
Kazuo Kawai, Tokyo, JP;
General Research of Electronics, Inc., Tokyo, JP;
Abstract
A frequency scanning receiver for a FSK signal of such a type that a center frequency is provided in an overhead portion of a packet. The receiver is constructed so that a remaining center level error, when the FSK signal is found by frequency scanning of a local oscillator, can be set to substantially zero even when frequency scanning is done quickly. In the receiver, a conversion point detector detects a time point when a demodulated base band signal having a center frequency output from a center frequency detector is scanned by a VFO and then crosses over a zero point in a comparator. At the time point a scanning voltage is held and is corrected by a correcting voltage from a correcting signal generating circuit, whereby an overpassing quantity corresponding to a scanning speed and a loop delay time of a system of the receiver can be corrected.