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Split type sound source positioning system and method

A sound source localization and separate technology, applied in the fields of signal processing and communication technology, can solve the problems of multiple sound sources, concurrent computing complexity, etc.

Active Publication Date: 2019-10-22
HANGZHOU WEIMING XINKE TECH CO LTD +1
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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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  • Split type sound source positioning system and method
  • Split type sound source positioning system and method
  • Split type sound source positioning system and method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Example 1 Basic microphone device layout plan

[0037] S1. Receive sound signals from multiple microphones. The microphones are divided into two groups, which are 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 , Each light pole is equipped with only one microphone. The structure of the centralized processor is as Figure 4 Shown, including multi-channel amplifier, A / D daughter board, DSP / FPGA / ARM processor. The signal processing process of the centralized processor is: first amplify the audio signal received by each channel, then perform A / D conversion, set the sampling frequency to 44100Hz, and then perform digital bandpass filtering to filter out low-frequency road noise and anti- For aliasing, the low-frequency cutoff frequency of the digital bandpass filter is set to 200...

Embodiment 2

[0078] Embodiment 2 Expanded microphone device arrangement scheme

[0079] S1. Receive sound signals from multiple microphones. The microphones are divided into two groups, which are 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 , Each light pole is equipped with only one microphone. The structure of the centralized processor is as Figure 4 Shown, including multi-channel amplifier, A / D daughter board, DSP / FPGA / ARM processor. The signal processing process of the centralized processor is: first amplify the audio signal received by each channel, then perform A / D conversion, set the sampling frequency to 44100Hz, and then perform digital bandpass filtering to filter out low-frequency road noise and anti- For aliasing, the low-frequency cutoff frequency of the digital bandpass filter...

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Abstract

The invention discloses a split type sound source positioning system and a split type sound source positioning method. The split type sound source positioning system comprises a plurality of microphones and a processor, wherein the microphones are divided into two groups, which are symmetrically arranged on both sides of a road respectively; the processor receives sound signals of the plurality ofmicrophones and processes the sound signals, performs envelope detection and edge detection on the sound signals, records a time-domain signal after a rising edge or before a falling edge within a preset time period, calculates a generalized cross-correlation function of the time-domain signal and all time-domain signals before the time-domain signal, and marks possible vehicle numbers or non-existent car numbers according to whether a peak value of the function is less than a threshold value, so as to determine all vehicle numbers in the time-domain signal; and one microphone is selected asthe reference microphone, time delays of the rest microphones relative to the reference microphone is obtained through calculation, and at least three time delays are selected to perform sound sourcepositioning based on a time difference of arrival. The split type sound source positioning system and the split type sound source positioning method can effectively solve the problem of multi-vehiclehonking detection and positioning, the devices are simple and easy to expand, the calculation complexity is low, and the real-time performance is good.

Description

Technical field [0001] The present invention relates to signal acquisition and processing technology, in particular to a system and method for detecting, marking and positioning multiple sound sources based on a separate sound signal collector, and belongs 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 vehicles honking. The transportation and environmental protection departments of some cities have formulated corresponding rules and regulations to prohibit motor vehicles from whistling in densely populated urban areas. However, relying only on manual law enforcement is inefficient and reliable. The specific implementation of these regulations has encountered huge difficulties. [0003] Microphone array-based soun...

Claims

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Application Information

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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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