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:
Jul. 22, 2003
Filed:
Apr. 21, 2000
Hidenori Matsumoto, Kanagawa, JP;
Atsuhiko Hashigaya, Kanagawa, JP;
Matsushita Electric Industrial Co., Ltd, Osaka, JP;
Abstract
A demodulating circuit contains an electric field level detector for detecting an electric field strength from a received modulation signal, comparators to for outputting electric field strength information PS, a detector for outputting a detection signal corresponding to a modulation signal, both a low-pass filter and a digital filter for removing a noise component from the detection signal, and a data comparator for comparing the detection signal with a reference voltage to output a digital signal. This demodulating circuit further includes a control circuit for controlling a cutoff frequency used in a digital filter , an output voltage amplitude of the detector , and the reference voltage of the data comparator in accordance with both the electric field strength information PS and control condition information PC saved in an EEPROM and supplied from a CPU , and also a judging circuit for judging the digital signal at preselected timing to produce a demodulation signal.