An acoustic focusing pickup device

Abstract

The invention discloses an acoustic focusing sound pickup device, which comprises a concave reflector. The arc of the concave reflector gradually increases from the bottom to the top, and the vertical distance from the arc surface to the center line gradually increases. The center of the bottom of the concave reflector There is a fixed frame; the fixed frame includes a support rod, one end of the support rod is connected to the concave reflector, and the other end is connected to an array microphone; the array microphone includes a PCB board, and a protective ring is sleeved on the PCB board, and the protective ring is connected to the fixed frame A plurality of MEMS microphones are welded on the side of the PCB board facing the bottom of the concave reflector, the PCB board is connected with wires, and the wires pass through the bottom of the concave reflector and are connected to a DSP signal processing module. Reflected sound waves are enhanced in one focus, and output sensitivity is improved; MEMS microphones have good repeatability and consistency, and are resistant to humid environments and temperature shocks; microphone array signals can support various voice recognition, voice enhancement, and voice separation modules.

Description

technical field [0001] The invention relates to the field of sound pickup devices, in particular to an acoustic focusing sound pickup device. Background technique [0002] The sound pickup device is an electronic product used to collect external sounds, and has been widely used in daily life, for example, communication equipment, recording equipment, etc. [0003] At present, commonly used sound pickup devices use the acoustic interference phenomenon to collect sound. When the sound comes from the direction of the long tube aligned with the sound pickup device, the difference in distance between each sound inlet hole and the diaphragm is used to form phase interference. The directional effect depends on the interference. the length of the tube. In the above sound pickup process, there are the following disadvantages when collecting sound in the far field: [0004] 1. The sound collection distance is short and the angle is wide, and the requirements for the acoustic structu...

AI Technical Summary

Problems solved by technology

[0004] 1. The sound collection distance is short and the angle is wide, and the requirements for the acoustic structure are very strict;

[0005] 2. It needs to be driven into the sound hole, which is affected by the ambient temperature and humidity and cannot be used in harsh environments;

[0006] 3. It is impossible to form a directional microphone array on a single unit

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