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:
Oct. 14, 2003
Filed:
Jun. 02, 2000
Atsuhiko Hashigaya, Kanakawa, JP;
Matsushita Electric Industries Co., Ltd., Osaka, JP;
Abstract
An FSK receiving apparatus has, as means for performing offset correction upon a demodulated base band signal, a second low pass filter for integrating the demodulated base band signal; a window comparator for detecting a DC offset component in an output voltage from the second low pass filter ; an up/down counter for incrementing or decrementing a count value on the basis of the output of the window comparator ; a clock generating portion for generating a timing signal for counting operation in the up/down counter ; a reference voltage generating portion for generating a reference voltage for a comparator on the basis of the output of the up/down counter ; and a charging circuit for supplying a reference voltage in the last frame to the second low pass filter so as to charge the second low pass filter with the last-frame reference voltage and set an initial value of the second low pass filter