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. 18, 2006
Filed:
Mar. 17, 2000
Yasunari Ikeda, Kanagawa, JP;
Taiwa Okanobu, Tokyo, JP;
Yasunari Ikeda, Kanagawa, JP;
Taiwa Okanobu, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
An interference signal from an adjacent signal is prevented and a desired signal demodulated. A frequency conversion circuitconverts a received signal frequency to a first intermediate frequency signal of a first intermediate frequency higher than the frequency of the signal to be demodulated by 57 MHz. The first intermediate frequency signal is further converted to a second intermediate frequency signal of a second intermediate frequency by a frequency conversion circuit. The second intermediate frequency is a frequency lower than the 57 MHz of the first intermediate frequency by exactly a frequency ½ of an FFT sampling f-clock. A clock generation circuitgenerates a signal of a frequency two times the FFT sampling clock, that is, four times the second intermediate frequency. The second intermediate frequency is sampled by the A/D conversion circuitbased on the signal supplied from the clock generation circuit, demodulated by a demodulation circuit, and subjected to an FFT operation by an FFT circuit, whereby the signal is demodulated.