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Indoor voice acquisition method and device based on self-adaptive rotating alignment

A technology of voice collection and collection method, which is applied in position/direction control, transducer circuit, non-electric variable control and other directions, can solve the problems of high cost, easy damage, inconvenience of carrying fixed microphones, etc. of wireless microphones, and achieves low cost, Easy-to-control, reduced number of effects

Active Publication Date: 2014-10-08
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0006] The present invention aims at the shortcomings of existing fixed microphones such as inconvenient portability, high cost and easy damage of wireless microphones, and provides an indoor voice collection method and device based on adaptive rotational alignment

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  • Indoor voice acquisition method and device based on self-adaptive rotating alignment
  • Indoor voice acquisition method and device based on self-adaptive rotating alignment
  • Indoor voice acquisition method and device based on self-adaptive rotating alignment

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specific example

[0071] Step 1, using the sound signal collected by the microphone array, the sound source coordinates are calculated according to the traditional positioning method based on time delay difference.

[0072] Step 2, using the sound source coordinates at the previous moment and the current sound source coordinates to calculate the rotation angle of the microphone (Δθ xyi ,Δβ zi ).

[0073] Step 3, according to the time delay and signal-to-noise ratio of the signals collected by each microphone, the speech signals are combined using formulas (5) and (6). Among them, C=0.6 in formula (6), SNR i by S i (n) is calculated.

[0074] Step 4, respectively judge the angle Δθ that needs to be rotated xyi and Δβ zi Is it greater than the threshold Γθ xy = 1° and Γβ z = 1°. If Δθ xyi greater than the threshold Γθ xy = 1°, then the stepper motor in the xy direction rotates Δθ xyi , otherwise no rotation; if Δβ zi greater than the threshold Γβ z = 1°, then the stepper motor in th...

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Abstract

The invention discloses an indoor voice acquisition method and device based on self-adaptive rotating alignment. The device comprises a rotatable microphone array, an A / D converter, a D / A converter, a signal processing unit, a USB output and an audio system. N microphones are adopted to pick up sound in a room, signals are returned to the signal processing unit after quantification and sampling, the signal processing unit calculates a result, sends the result to a stepping motor drive device and meanwhile processes data acquired by the microphones to the audio system to be played or output through a USB. The method comprises the steps of positioning a sound source, calculating required rotation angles of the microphones, merging digital signals of the microphones, judging whether the microphones rotate or not and the like. The shortcoming that a traditional acquired sound source signal is small in signal to noise ratio and poor in accuracy is overcome, and the indoor voice acquisition method and device has the advantages of being high in acquisition accuracy, wide in application range, low in cost, simple in system installation, easy to control and the like.

Description

technical field [0001] The invention relates to voice collection technology, in particular to an indoor voice collection method and device based on adaptive rotation alignment using sound source location and voice collection equipment. Background technique [0002] With the development of science and technology, indoor voice collection technology is becoming more and more important. Indoor voice collection technology is widely used in education, culture and scientific research fields, such as teaching in educational institutions, stage performances, or sound source collection in scientific research units. And so on are inseparable from the directional voice acquisition technology. Therefore, high-precision, low-cost voice acquisition technology and equipment are particularly important and urgent. [0003] At present, there are mainly two ways of wireless microphone and fixed microphone for indoor voice collection. Wireless microphone is a popular indoor voice collection te...

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Application Information

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IPC IPC(8): H04R1/08H04R3/00G05D3/00
Inventor 宁更新李笑涵彭扬韦岗
Owner SOUTH CHINA UNIV OF TECH