Title:
LASER MICROPHONE AND TERMINAL
Document Type and Number:
WIPO Patent Application WO/2022/048588
Kind Code:
A1
Abstract:
Provided is a laser microphone, comprising a vibrating diaphragm, a laser device, a control circuit, a self-mixing signal acquisition apparatus and a signal processing circuit, wherein the laser device is used for emitting light to the vibrating diaphragm and receiving a feedback light signal from the vibrating diaphragm, and the feedback light signal interferes with a laser in a resonant cavity of the laser device to obtain a self-mixing light signal; the distance between the laser device and the vibrating diaphragm is 30-300 um; the control circuit is connected to the laser device, and is used for driving and controlling the laser device to emit light; the self-mixing signal acquisition apparatus is connected to the laser device, and is used for acquiring a target voltage signal related to the self-mixing light signal; and the signal processing circuit is connected to the self-mixing signal acquisition apparatus, and is used for receiving the target voltage signal outputted by the self-mixing signal acquisition apparatus and processing same into an audio voltage signal. The laser microphone has a high signal-to-noise ratio, such that the voice recognition rate and the awakening rate thereof can be increased, and a long-distance pickup effect is improved. Further provided is a terminal comprising the laser microphone.
Inventors:
HOU XIAOKE (CN)
ZHANG SHIXIONG (CN)
RUAN SHENGJIE (CN)
ZHANG SHIXIONG (CN)
RUAN SHENGJIE (CN)
Application Number:
PCT/CN2021/116172
Publication Date:
March 10, 2022
Filing Date:
September 02, 2021
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H04R23/00; G01H9/00
Foreign References:
| CN110186548A | 2019-08-30 | |||
| US20040071383A1 | 2004-04-15 | |||
| CN203859873U | 2014-10-01 | |||
| CN108106715A | 2018-06-01 | |||
| CN109945964A | 2019-06-28 | |||
| CN202010924113A | 2020-09-04 |
Other References:
CHENG JIN, FENG JIE;ZHAO LONGJIANG;ZOU XIAOPING: "Mathematic Model of Optical Fiber Microphone Based on Fabry － Perot Interferometer", AUDIO ENGINEERING - DIANSHENG JISHU, BEIJING DIANSHI DIANSHENG ZAZHISHE, JP, vol. 37, no. 12, 17 December 2013 (2013-12-17), JP , pages 31 - 34, XP055907241, ISSN: 1002-8684, DOI: 10.16311/j.audioe.2013.12.008
See also references of EP 4199540A4
See also references of EP 4199540A4
Attorney, Agent or Firm:
SCIHEAD IP LAW FIRM (CN)
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