US 12,323,764 B2
Laser microphone and terminal
Xiaoke Hou, Dongguan (CN); Shixiong Zhang, Dongguan (CN); and Shengjie Ruan, Shenzhen (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed on Mar. 3, 2023, as Appl. No. 18/177,814.
Application 18/177,814 is a continuation of application No. PCT/CN2021/116172, filed on Sep. 2, 2021.
Claims priority of application No. 202010924113.6 (CN), filed on Sep. 4, 2020.
Prior Publication US 2023/0209278 A1, Jun. 29, 2023
Int. Cl. H04R 3/00 (2006.01); H04R 23/00 (2006.01)
CPC H04R 23/008 (2013.01) [H04R 3/00 (2013.01); H04R 2430/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A laser microphone, comprising:
a diaphragm;
a laser device;
a control circuit;
a self-mixing signal obtaining apparatus; and
a signal processing circuit, wherein
the laser device is configured to emit light to the diaphragm, and receive a feedback light signal from the diaphragm, the feedback light signal interferes with laser in a resonant cavity of the laser device and obtains a self-mixing light signal, a distance between the laser device and the diaphragm is L, and a range of L is 30 μm≤L≤300 μm,
the control circuit is connected to the laser device, and the control circuit is configured to drive and control the laser device to emit light,
the self-mixing signal obtaining apparatus is connected to the laser device, and the self-mixing signal obtaining apparatus is configured to obtain and output a target voltage signal related to the self-mixing light signal, and
the signal processing circuit is connected to the self-mixing signal obtaining apparatus, and the signal processing circuit is configured to receive the target voltage signal output by the self-mixing signal obtaining apparatus, and process the target voltage signal into an audio voltage signal.
 
19. A terminal, comprising:
a laser microphone, wherein the laser microphone comprises:
a diaphragm;
a laser device;
a control circuit;
a self-mixing signal obtaining apparatus; and
a signal processing circuit, wherein
the laser device is configured to emit light to the diaphragm, and receive a feedback light signal from the diaphragm, the feedback light signal interferes with laser in a resonant cavity of the laser device and obtains a self-mixing light signal, a distance between the laser device and the diaphragm is L, and a range of L is 30 μm≤L≤300 μm,
the control circuit is connected to the laser device, and the control circuit is configured to drive and control the laser device to emit light,
the self-mixing signal obtaining apparatus is connected to the laser device, and the self-mixing signal obtaining apparatus is configured to obtain and output a target voltage signal related to the self-mixing light signal, and
the signal processing circuit is connected to the self-mixing signal obtaining apparatus, and the signal processing circuit is configured to receive the target voltage signal output by the self-mixing signal obtaining apparatus, and process the target voltage signal into an audio voltage signal.
 
20. A laser microphone, comprising:
a diaphragm;
a laser device;
a control circuit;
a self-mixing signal obtaining apparatus; and
a signal processing circuit, wherein
the laser device is configured to emit light to the diaphragm, and receive a feedback light signal from the diaphragm, and the feedback light signal interferes with laser in a resonant cavity of the laser device and obtains a self-mixing light signal,
the self-mixing signal obtaining apparatus is connected to the laser device, and the self-mixing signal obtaining apparatus is configured to obtain and output a target voltage signal related to the self-mixing light signal, and
the signal processing circuit is configured to receive the target voltage signal output by the self-mixing signal obtaining apparatus, and process the target voltage signal into an audio voltage signal.