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Distributed sound source localization system and method

A sound source localization and separation technology, which is applied in the field of communication technology and signal processing, and can solve problems such as multiple sound sources and concurrent calculation complexity

Active Publication Date: 2021-06-15
HANGZHOU WEIMING XINKE TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the application scenario of detecting and locating motor vehicle horns, a system and method for detecting, marking and locating multiple sound sources based on a split single-microphone or small multi-microphone array is provided to solve multiple problems in the vehicle whistle detection and positioning system. Sound sources, concurrency, computational complexity and real-time issues

Method used

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  • Distributed sound source localization system and method
  • Distributed sound source localization system and method
  • Distributed sound source localization system and method

Examples

Experimental program
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Embodiment 1

[0036] Embodiment 1 Arrangement scheme of basic microphone device

[0037] S1. Receive sound signals from a plurality of microphones. The microphones are divided into two groups, respectively located on both sides of the road and arranged symmetrically.

[0038] The centralized processor initializes an independent processing channel c (c=0,1,2,...,mic number-1) for each electret microphone. The system architecture is as follows image 3 , where each light pole is equipped with only one microphone. The structure of the centralized processor is as follows Figure 4 As shown, including multi-channel amplifier, A / D daughter board, DSP / FPGA / ARM processor. The signal processing flow of the centralized processor is as follows: firstly amplify the audio signal received by each channel, then perform A / D conversion, set the sampling frequency to 44100Hz, and then perform digital band-pass filtering to filter out low-channel channel noise and anti-corrosion For aliasing, the low cut...

Embodiment 2

[0078] Embodiment 2 Arrangement scheme of extended microphone device

[0079] S1. Receive sound signals from a plurality of microphones. The microphones are divided into two groups, respectively located on both sides of the road and arranged symmetrically.

[0080] The centralized processor initializes an independent processing channel c (c=0,1,2,...,mic number-1) for each electret microphone. The system architecture is as follows image 3 , where each light pole is equipped with only one microphone. The structure of the centralized processor is as follows Figure 4 As shown, including multi-channel amplifier, A / D daughter board, DSP / FPGA / ARM processor. The signal processing flow of the centralized processor is as follows: firstly amplify the audio signal received by each channel, then perform A / D conversion, set the sampling frequency to 44100Hz, and then perform digital band-pass filtering to filter out low-channel channel noise and anti-corrosion For aliasing, the low ...

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Abstract

The invention discloses a split-type sound source localization system and method. The system includes: a plurality of microphones, the microphones are divided into two groups, respectively located on both sides of the road and arranged symmetrically; a processor receives the sound of the plurality of microphones signal and process it, perform envelope detection on the sound signal, perform edge detection, record the time domain signal within the preset time period after the rising edge or before the falling edge, and compare it with all the time domain signals before recording the time domain signal Calculate the generalized cross-correlation function, according to whether the peak value of the function is less than the threshold, mark the vehicle number that may exist or the vehicle number that does not exist, so as to determine all the vehicle numbers in the time domain signal; select a certain microphone as a reference microphone, and calculate the relative value of other microphones. Based on the time delays of the reference microphones, at least three time delays are selected to perform sound source localization based on the time difference of arrival. The invention can effectively solve the problem of multi-vehicle siren detection and positioning, and at the same time, the device is simple and easy to expand, the calculation complexity is low, and the real-time performance is good.

Description

technical field [0001] The invention relates to signal collection and processing technology, in particular to a system and method for multi-sound source detection, marking and positioning based on a split sound signal collector, belonging to the fields of communication technology, signal processing technology and the like. Background technique [0002] In recent years, with the rapid development of urban economy, the number of motor vehicles has increased sharply, and traffic noise pollution has become increasingly serious, especially the sound of motor vehicle whistles. The transportation and environmental protection departments of some cities have formulated corresponding rules and regulations to prohibit motor vehicles from honking in densely populated urban areas, but only relying on manual law enforcement is inefficient and unreliable, and the specific implementation of these regulations has encountered great difficulties. [0003] Microphone array-based sound source lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/20
CPCG01S5/20
Inventor 吴建军李昊尘刘宇邦
Owner HANGZHOU WEIMING XINKE TECH CO LTD
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