Voice signal acquisition method for microphone array and acquisition device thereof

Abstract

The invention relates to a voice signal acquisition method for a microphone array and an acquisition device thereof. The voice signal acquisition method comprises the following steps: acquiring multiple groups of voice signals, wherein each group of voice signals comprise voice signals of two interphase or adjacent microphones, performing conversion processing on two paths of voice signals in eachgroup to obtain digital signals corresponding to the two paths of voice signals, and performing synthesis processing according to the obtained digital signals to obtain multi-channel stereo signals.A cross injection acquisition mode is adopted for microphone voice signals, therefore, the voice signals of the adjacent or alternate microphones can be used as sampling reference, according to the invention, an acquisition channel of each group of voice signals has independent acquisition capability, synchronous acquisition requirements of different acquisition positions can be realized, the mixed acquisition effect of the voice signals can be improved, the design difficulty of synchronous acquisition of the multi-channel microphone array can be reduced, and the expansibility of voice signalacquisition of the microphone array can be improved.

Description

technical field [0001] The present application relates to the field of speech signal processing, in particular to a method for collecting speech signals for a microphone array and a collection device thereof. Background technique [0002] At present, microphone signal collectors generally use independent analog-to-digital conversion ADCs to complete digital audio signal acquisition under the control of microcontrollers. Compared with traditional independent analog signal ADC acquisition technology, dual-channel stereo acquisition technology has low cost, low Power consumption, high sampling bits, programmable gain control, good synchronous acquisition characteristics, fast AD conversion time, etc., are widely used in artificial intelligence voice signal acquisition terminals, digital communication cameras and mobile device voice signal acquisition and processing The field is a key technology to realize the digitization of equipment. [0003] like figure 1 As shown, it is t...

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Problems solved by technology

[0005] It can be seen that the existing technology has the following disadvantages: (1) The sampling rate of the voice signal collector is limited by the number of acquisition channels and the main frequency of the core controller of the data read-write control unit and the digital transmission bandwidth. When the cable communicates with the data reading and writing control unit, due to the limitation of the USB data transmission bandwidth, the number of acquisition channels with a sampling rate of 200K and a quantization number of 12 bits cannot be expanded without limit when reading data through the USB interface. Can only accommodate about 10 channels of data simultaneous acquisition

[0006] (2) Due to the high clock frequency of the digital-to-analog converter ADC, in the design of the multi-channel microphone voice signal acquisition circuit, it will encounter the phenomenon of insufficient clock drive capability, signal attenuation and asynchronous acquisition, complex circuit design and high cost

In addition, in the circuit design and integration process of the preamplifier circuit of ordinary collectors, due to the differences in the parameters of electronic devices such as resistance and capacitance, the magnification of each channel will vary greatly, and it is very susceptible to interference from changes in the external environment. The problem of asynchronous phenomenon deterioration and serious noise in analog-to-digital converter signal acquisition

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