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:
Oct. 01, 2002
Filed:
Jun. 15, 2001
Alexander Paritsky, Modiin, IL;
Alexander Kots, Ashdod, IL;
Okihiro Kobayashi, Tokyo, JP;
Nobuhiro Miyahara, Tokyo, JP;
Phone-Or Ltd., Or-Yehuda, IL;
Abstract
A device for collecting sounds from objects comprises a plurality of microphones whose directivity can be varied depending on the environment in which each object is located. An optical microphone includes a vibration board ( ) which vibrates by sound pressure, a light source ( ) for emitting a light beam to the vibration board ( ), a photodetector ( ) which receives the light beam reflected from the vibration board ( ) and produces a signal corresponding to the vibration of the vibration board ( ), a drive circuit ( ) for supplying the light source ( ) with predetermined current, and a negative feedback circuit ( ) that supplies the drive circuit ( ) with a negative feedback signal consisting of a signal output from the photodetector ( ). The negative feedback circuit ( ) changes the amount of negative feedback depending on the environment.