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. 01, 2001
Filed:
Sep. 14, 1998
Masatoshi Ohtsuka, Fukuoka, JP;
Naoki Koga, Fukuoka-ken, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A spread spectrum demodulation circuit includes a correlation signal generator which generates a correlation signal from a reception signal to which a quadrature phase shift keying and a spread spectrum modulation are performed. First and second delay elements have different delay times, and delay the correlation signal to obtain first and second delay signals, respectively. First and second adders add the correlation signal and the first and second delay signals to obtain first and second addition signals, respectively. First and second distributors distribute the first and second addition signals, respectively. First and second multiplication circuits obtain first and second multiplication signals from distributed signals inputted from the first and second distributors, respectively. A data demodulation circuit demodulates the first and second multiplication signals to recover a transmission information signal.