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Indoor speech collection method and device based on adaptive rotation alignment

A voice collection and collection device technology, applied in the field of voice collection, can solve the problems of inconvenient portability of fixed microphones, high cost of wireless microphones, and easy damage, and achieve the effects of low cost, easy control, and reduced quantity

Active Publication Date: 2017-08-25
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

Method used

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  • Indoor speech collection method and device based on adaptive rotation alignment
  • Indoor speech collection method and device based on adaptive rotation alignment
  • Indoor speech collection method and device based on adaptive rotation alignment

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[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 collection method and device based on adaptive rotation alignment. The device includes a rotatable microphone array, an A / D converter, a D / A converter, a signal processing unit, a USB output and a sound system, and adopts N Each microphone picks up the sound in the room, after quantization and sampling, each signal is returned to the signal processing unit, and the signal processing unit calculates the result and sends it to the stepping motor drive device. The data is processed and handed over to the audio system for playback or USB output. The method includes the steps of locating the sound source, calculating the angle at which the microphone needs to be rotated, merging the digital signals of each microphone, and judging whether the microphone is rotated or not. The invention overcomes the shortcomings of low signal-to-noise ratio and poor precision of traditional sound source signal collection, and has the advantages of high collection precision, wide application range, low cost, simple system installation, and easy control.

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...

Claims

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Application Information

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