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:
Aug. 08, 2006
Filed:
Dec. 23, 2002
Kazuo Kawai, Tokyo, JP;
Kazuo Kawai, Tokyo, JP;
General Research of Electronics, Inc., Tokyo, JP;
Abstract
In demodulation of a FSK signal, a circuit for detecting a center level of said signal and correcting an error thereof is provided. Said circuit can accomplish the detection of the center level correctly always even if there exist cords with various lengths in a length of '1' or '0' of a synchronizing signal at beginning of communication and during communication, and yet frequency variation happens at that time. Said circuit has sample hold circuits SHand SHeach of which are provided so as to correspond to “1” and “0” of an input demodulated data signal. In said circuit a center level value is an average value of voltages held in said sample hold circuits when said signal changes from “1” to “0” or “0” to “1” and a center level value is obtained by adding or subtracting a voltage of ½ of difference between two hold voltages held in another sample hold circuit SHto or from a hold voltage in a receiving side at present time when said signal keeps “1” or “0” continuously. Data information is judged by a compartor of which a reference value is anyone of said two center level value.