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:
Mar. 12, 2002
Filed:
Jun. 15, 2000
Applicant:
Inventor:
Yoshihiro Inada, Itami, JP;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N 9/66 ; H04N 5/455 ; H04L 2/722 ;
U.S. Cl.
CPC ...
H04N 9/66 ; H04N 5/455 ; H04L 2/722 ;
Abstract
A demodulator circuit including: a signal generating circuit for generating a sine-wave signal and a cosine-wave signal whose frequencies are same as that of the carrier wave of a modulated signal, a multiplying circuit for multiplying the modulated signal by the sine-wave signal and the cosine-wave signal generated by the signal generating circuit, and a filtering circuit for eliminating the frequency twice as high as that of the carrier wave from each of the results of the computation conducted by the multiplying circuit. Due to this, no restriction is imposed by the frequency of the system clock signal in configuring the system as a whole.