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A Sound Source Localization System Based on Distributed Microphone Array

A microphone array and sound source localization technology, applied in positioning, radio wave measurement systems, instruments, etc., can solve problems such as limited microphone array topology

Active Publication Date: 2020-04-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method is limited by the topology of the microphone array

Method used

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  • A Sound Source Localization System Based on Distributed Microphone Array
  • A Sound Source Localization System Based on Distributed Microphone Array
  • A Sound Source Localization System Based on Distributed Microphone Array

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Experimental program
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Embodiment 1

[0184] In order to verify the reliability of the sound source localization method proposed by the present invention, a software simulation experiment is carried out to analyze its localization performance. The positioning method, SRP-PHAT positioning method and geometric positioning method proposed in this paper are realized by Matlab 2014a software platform simulation.

[0185] The size of the simulated room is 11×7×3㎡, and 8 microphone arrays are randomly placed to form a distributed system. Use the Image model to simulate the room impulse response, which is used to simulate the room reverberation of the speech signal. Among them, the sound velocity is taken as the value under the condition of 1 standard atmospheric pressure and 20°C, and the sound velocity is 343 m / s.

[0186] From the simulation results, there is a certain deviation between the estimated position of the sound source and the actual position, and the positioning error is

[0187]

[0188] Among them, (x...

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Abstract

The invention discloses a sound source positioning system based on a distributed microphone array, and the system comprises a preprocessing unit which carries out the frame dividing of a signal according to an initial audio signal collected by a microphone subarray, analyzes and calculates the short-time energy of each frame of the audio signal, obtains the noise frame and voice frame in an audio frame sequence, and obtains the signal to noise ratio of the audio frame sequence; a subarray selection unit which analyzes the direct-reverse ratio (DRR) of the signal received by each subarray of the microphone array, and selects the microphone subarray with the DRR being greater than a threshold value; a time delay calculation unit; a sound source positioning unit which carries out the pre-estimation of the position of the sound source according to the time delay of each microphone pair, and obtains a rough positioning module of a sound source space U; a precise positioning module which carries out the searching in the sound source space U, and obtains the maximum point of the improved controllable response power in the sound source space U. The system analyzes the positioning result of the plurality of microphone subarrays, and finally determines the position of the sound source through consistency processing.

Description

technical field [0001] The invention relates to a sound source localization system based on a distributed microphone array. Involving Patent Classification Number G Physics G01 Measurement; Test G01S Radio Orientation; Radio Navigation; Using Radio Waves to Measure Distance or Velocity; Using Radio Wave Reflection or Re-radiation Positioning or Presence Detection; Positioning by the mate of two or more directions or lines of position; positioning by determining the mate of two or more distances. Background technique [0002] In recent years, the topic of artificial intelligence has become extremely hot, and it has shown a trend of being ubiquitous in people's lives. In the "Internet of Things era", voice plays a pivotal role in human-computer interaction. In the past few years, the speech signal processing method based on the distributed microphone array has gradually become a new research hotspot, and in the "voice control era", the importance of this technology is partic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/22
CPCG01S5/22
Inventor 陈喆殷福亮卢艳美
Owner DALIAN UNIV OF TECH