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:
Feb. 14, 2012
Filed:
Sep. 26, 2008
Liangfeng Leon Xu, Coppell, TX (US);
Chenguang Cai, Beijing, CN;
Jani K. Nurminen, Lempäälä, FI;
Xia S. Wang, Beijing, CN;
Antti O. Salo, Beijing, CN;
Koray Ozcan, Farnborough, GB;
Liangfeng Leon Xu, Coppell, TX (US);
Chenguang Cai, Beijing, CN;
Jani K. Nurminen, Lempäälä, FI;
Xia S. Wang, Beijing, CN;
Antti O. Salo, Beijing, CN;
Koray Ozcan, Farnborough, GB;
Nokia Corporation, Espoo, FI;
Abstract
An apparatus uses a transducer to produce vibration in the ultrasonic frequency range and in the audible frequency range. A membrane or cantilever structure is coupled to the transducer to produce acoustic waves. When the vibration is in the audible frequency range, the membrane structure works like a conventional loudspeaker. When the vibration is in the ultrasonic frequency range, the ultrasonic signal is modulated by audio signal for creating better directivity. The acoustic waves in the ultrasonic frequency range can reproduce directional audible sound due to the nonlinear interaction of ultrasonic waves in air.