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
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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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