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:
May. 27, 2003
Filed:
Jan. 05, 2000
Isao Matsugaki, Fukuoka, JP;
Mutsuhiko Oishi, Fukuoka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A receiver and a phase extraction circuit are capable of demodulating at high resolution if the sampling frequency is close to the frequency of received signal. In the phase extraction circuit, the received signal modulated in phase is sampled when lowered to an intermediate frequency. When the sampling frequency at this time is selected around the intermediate frequency, a continuous portion appears in one position of the sampling data row. The position of the continuous portion is determined by the phase of the received signal, and therefore a one-to-one correspondence table of the continuous position and phase of received signal is prepared. By detecting the continuous position, the phase information can be obtained from the table. As a result, it is possible to demodulate directly at the intermediate frequency, and therefore the circuit scale is substantially simplified, the number of parts is curtailed, and the size is reduced.