Title:
OPTICAL MICROPHONE
Document Type and Number:
WIPO Patent Application WO/2021/172287
Kind Code:
A1
Abstract:
An optical microphone comprising: a light source (110); a first optical branching unit (120) for splitting light emitted from the light source into reference light and measurement light; a second optical branching unit (130) for splitting the measurement light into N (N is an integer of two or more) measurement lights; a first emitting unit (141) for emitting the N measurement lights from mutually different positions toward a predetermined space (S1); a first light receiving unit (145) for receiving the N measurement lights (144) that have propagated through the predetermined space; a third optical branching unit (150) for splitting the reference light into N reference lights; N optical couplers (161 to 168) for respectively coupling the N measurement lights received by the first light receiving unit to the N reference lights one-to-one; N photodetectors (171 to 178) for respectively receiving N coupled lights and each detecting interference between the measurement light and the reference light; and a control unit (180) for subjecting N detection signals output from the N photodetectors to signal processing to control the directivity of collected sound.
Inventors:
MATSUMURA TOSHIYUKI (JP)
TERASHIMA YUKI
TERASHIMA YUKI
Application Number:
PCT/JP2021/006663
Publication Date:
September 02, 2021
Filing Date:
February 22, 2021
Export Citation:
Assignee:
PANASONIC IP CORP AMERICA (US)
International Classes:
H04R1/40; H04R3/00; H04R23/00
Foreign References:
| JPS6018100A | 1985-01-30 | |||
| JP2007295131A | 2007-11-08 | |||
| JP2005283160A | 2005-10-13 |
Attorney, Agent or Firm:
NII, Hiromori et al. (JP)
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