Beam forming directional microphone

Abstract

The invention relates to the electroacoustic field of loudspeakers and provides a beam forming directional microphone. A beam forming technology is adopted to form a directional property; a directional shaft is turned to the direction of a sound source; the microphone comprises a beam forming noise processing DSP processing chip; the processing chip is connected with two non-directional microphoneDAC inputs; the processing chip is provided with a crystal 4MHz crystal oscillator; the processing chip is provided with a reset chip for controlling connection; a 3.3V chip power supply module supplies power for both the processing chip and the reset chip; the 3.3V chip power supply module is further connected with 5V power supply; the 5V power supply supplies power for an operational amplifierchip and provides acoustical signal output at the same time; and the processing chip is connected with the operational amplifier chip through audio output DAC chip data. Two non-directional microphones are used, the design adopts the beam forming technology to form the directional property; the directional shaft is turned to the direction of the sound source, so the environmental noise is greatlyreduced; and fixed noise remained in the direction of the directional shaft is further reduced through a noise suppression function.

Description

technical field [0001] The invention relates to the field of loudspeaker electroacoustics, in particular to a beam-forming directional microphone. Background technique [0002] With the development of voice recognition technology, voice input systems are widely used in mobile devices such as car navigation systems and smartphones, and will also be extended to home appliances in the future. [0003] The design uses beamforming technology to create directivity, which greatly reduces ambient noise by turning the pointing axis in the direction of the sound source. With the noise suppression function, the fixed noise remaining in the direction of the pointing axis is further reduced. This technology is different from the technology that only uses noise cancellation. It can pick up the sound source more clearly, and develops a directional microphone solution. By using beamforming technology using two non-directional microphones, the sound source voice in a specific direction beco...

AI Technical Summary

Problems solved by technology

[0004] So far, directional microphones can only form directivity through the physical structure (cylindrical structure), but if the directivity is to be improved, the size of the microphone will increase without changing the physical structure, and the directivity cannot be controlled. appear, and the use of beamforming technology to form a directional microphone can solve these problems

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