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:
Dec. 02, 1997
Filed:
Apr. 01, 1996
Masahiro Ohki, Tokyo, JP;
Hideho Tomita, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
The object of the present invention is to provide a wireless modem that performs detection with high reliability even in the case of carrier detection by analogue level, and whereby a large decrease in power consumption in standby mode can be obtained. Control unit 80 controls synthesizer 100 during transmission mode so that it transmits from antenna 200 one or two or more unmodulated carriers that have not been subjected to spectrum dispersion, at the head of the transmission preamble signal; in addition it performs on/off control of the output transmission clock pulse and reception clock pulse of clock pulse generating control unit 90, and changeover control of transmission/reception switch 53. Control unit 80 outputs a carrier detection enable signal to level comparator 75. Controlling its operation. In standby mode, control unit 80 controls synthesizer 100 and IF unit 40 such that the received unmodulated carrier can be detected by level detector 60 and level comparator 75.