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Extensible microphone array and establishment method thereof

The technology of a microphone array and its establishment method is applied in the field of expandable microphone array and its establishment, which can solve the problems of poor sound source localization ability, lack of adc chip, and influence on microphone array algorithm functions, etc., so as to achieve low working cost and high computing power Strong, good algorithm scalability

Active Publication Date: 2018-04-06
BESTECHNIC SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of the 2 microphone solution is simple and can remove noise within a certain range, but the biggest drawback is that the ability to locate the sound source is relatively poor, and it can only locate within 180°
However, if there is no synchronization mechanism between chips, there will be random phase differences in the data of multiple microphones, which will seriously affect the function of the microphone array algorithm
And this synchronization mechanism needs to be implemented inside the chip, and the ADC chips currently on the market hardly have this function

Method used

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  • Extensible microphone array and establishment method thereof
  • Extensible microphone array and establishment method thereof
  • Extensible microphone array and establishment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Taking 2 chips to form 4 microphone arrays as an example, the system block diagram is as follows figure 1 shown.

[0039] An expandable microphone array includes 2 chips and 4 microphones, each chip includes two ADCs, and each ADC is connected to 1 microphone, that is, each chip is connected to 2 microphones through wires;

[0040]The distance between the microphones is 4cm, and no more than 10cm, so as to ensure sufficient phase discrimination between the multi-channel microphones; wherein, the microphones are arranged in a linear manner, and the distance between the microphones is The distance between each channel determines the phase relationship of the audio data. The greater the distance between the microphones, the stronger the ability of the array to pick up sound, but the distance between the microphones cannot exceed half of the signal wavelength.

[0041] In the first step, the first chip is set as the master chip, and the others are slave chips. The master c...

Embodiment 2

[0050] An expandable microphone array, including 4 chips and 8 microphones, each chip supports 2 microphones, the system block diagram is as follows figure 2 shown. Each chip includes two ADCs, and each ADC is connected to a microphone, that is, each chip is connected to two microphones through wires.

[0051] The distance between the adjacent microphones is 4cm, and no more than 10cm, so as to ensure sufficient phase discrimination between the multi-channel microphones; wherein, the microphones are arranged in a linear manner, and the distance between the microphones is The distance of sound pickup determines the phase relationship of each channel of audio data. The greater the distance between the microphones, the stronger the ability of the array to pick up sound, but the distance between the microphones cannot exceed half of the signal wavelength.

[0052] see figure 2 , in step 1, the system sets the third chip as the master chip, the master chip 3 includes a synctrig...

Embodiment 3

[0058] In a similar manner to the composition of 16-mic or 32-mic system samples, image 3 It shows the structural block diagram extended to any number of microphones, and also shows the synchronous trigger mechanism and data transmission interface.

[0059] Wherein, the synchronous triggering mechanism in step 1 is specifically: select chip N as the master chip, and others are slave chips, and the master chip N can synchronously trigger all other chips to start data collection at the same time through gpio; wherein, each chip is connected to at least Two microphones, through the cascade connection of multiple chips, any microphone can be expanded.

[0060] Wherein, the master chip N includes a sync trigger interface, and the sync trigger interface is connected to all slave chips in parallel through wires at the same time, that is, the slave chips are connected in parallel to the master chip through the sync trigger interface. Among them, the specific steps of synchronously c...

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Abstract

The invention provides an extensible microphone array and an establishment method thereof. A synchronous sampling mechanism between chips is adopted, and adc synchronous sampling of the chips is controlled through a gpio, so that a phase difference of multi-channel adc data is ensured to be within 1 microsecond, and synchronous operation of the chips is guaranteed; each chip independently completes noise reduction, echo cancellation or a beam forming algorithm of the double microphones, so that the system overhead can be effectively dispersed, and the load of the whole system is reduced; audiodata processed by a single slave chip is cascaded and transmitted to a main chip to complete algorithm processing of the microphone array, the system is expanded to any number of microphone arrays through cascading, and meanwhile, the chips form the microphone array, so that compared with a single-chip multi-adc scheme, the cost is lower and the expansibility is more flexible.

Description

technical field [0001] The present invention relates to the technical field of microphones, in particular to an expandable microphone array and its establishment method. Background technique [0002] With the development of speech recognition technology, speech has become the basic way of human-computer interaction, and its convenience and naturalness are unmatched by other methods. Many companies in the field of artificial intelligence have launched interactive products of artificial intelligence, mainly in the form of network speakers. The voice recognition on the speaker adopts far-field voice recognition technology, that is, no matter where the speaker is standing in the house, the speaker can receive the speaker's voice command, complete the voice recognition and execute the command. The main technical difficulty of remote speech recognition is: environmental noise, multi-path reflection and reverberation will affect the speech recognition rate. Therefore, a method of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R1/08H04R3/02G06F3/16G10L15/22
CPCG06F3/162G10L15/22G10L2015/223H04R1/083H04R3/02
Inventor 杨磊孔海军
Owner BESTECHNIC SHANGHAI CO LTD
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