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:
Aug. 21, 2007
Filed:
Dec. 09, 2003
Daisuke Higashihara, Hyogo, JP;
Shokichiro Hino, Tokyo, JP;
Koichi Tsuchiya, Tokyo, JP;
Tomohiko Endo, Tokyo, JP;
Daisuke Higashihara, Hyogo, JP;
Shokichiro Hino, Tokyo, JP;
Koichi Tsuchiya, Tokyo, JP;
Tomohiko Endo, Tokyo, JP;
Etani Electronics Co., Ltd., Tokyo, JP;
TOA Corporation, Hyogo, JP;
Abstract
A devicefor measuring a propagation time of a sound wave comprises a sound source meansand a calculation means. The sound source meansoutputs a time stretched pulse as a sound source signal input to a speaker. The calculation meanscalculates a cross-correlation function of the time stretched pulse and the sound signal which is output from the speakerand is received in a microphone. Based on the cross-correlation function, the propagation time of the sound wave between the speakerand the microphoneis found.