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:
Apr. 28, 2015
Filed:
Jul. 26, 2011
Applicant:
Naoki Oshima, Tokyo, JP;
Inventor:
Naoki Oshima, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L 27/06 (2006.01); H04B 1/10 (2006.01); H04B 1/30 (2006.01); H04B 1/00 (2006.01);
U.S. Cl.
CPC ...
H04B 1/10 (2013.01); H04B 1/30 (2013.01); H04B 1/0007 (2013.01);
Abstract
A signal detection device includes: a band limiting filter in which cutoff frequency is changeable; a signal detection unit that detects whether or not a signal of a specific frequency is present, from a received signal; and a control unit that executes a first signal detection that causes the signal detection unit to detect a signal, with a cutoff frequency of the band limiting filter less than the Nyquist frequency of an A/D converter, and a second signal detection that causes the signal detection unit to detect a signal, with a cutoff frequency of the band limiting filter greater than or equal to the Nyquist frequency of the A/D converter.