Expressway audio vehicle detection device and method thereof

Abstract

The invention relates to an expressway audio vehicle detection device and a method thereof. By the aid of the detection device, a microphone array signal acquisition module acquires an audio signal on a lane, the audio signal is subjected to band-splitting filtering and framing through a signal processing module after being subjected to de-noising processing through a noise suppression module, cross-correlation processing is conducted among sub-band signals, an audio space spectrogram is obtained, a vehicle detection module tracks a track of the maximum value on the audio space spectrogram and judges whether a vehicle passes, and the vehicle type and the vehicle speed are obtained through a vehicle type recognition module and a vehicle speed recognition module if the vehicle passes. The detection method is based on the device, a minimum statistical noise estimation method of the adaptive window length is adopted, the signal which is subjected to noise suppression processing is subjected to band-splitting filtering and framing processing, then cross-correlation processing is conducted among same sub-band signals, cross-correlation results are summed after being subjected to amplitude compression and are unfolded along a timer shaft, and an audio signal space-time spectrum is obtained. The method and the device have the advantages of being low in cost, low in energy consumption,easy to construct, interference resisting, capable of working in all weather and the like.

Description

technical field [0001] The invention belongs to the technical field of intelligent transportation, and in particular relates to an audio vehicle detection device using a microphone array as a sound pickup device and a method thereof. Background technique [0002] The collection of traffic information on expressways, especially the acquisition of the number, speed and type of vehicles, plays an important role in the field of intelligent transportation technology. As an important part of intelligent transportation, related technologies are widely used in related work such as toll collection systems, traffic data statistics, and real-time traffic dispatching. The accurate acquisition of information such as the number, speed, and type of vehicles is of great significance for measuring the operating efficiency of expressways and setting toll standards at toll stations. [0003] Due to the development of intelligent transportation technology, a large number of vehicle detectors a...

AI Technical Summary

Problems solved by technology

Its disadvantages are that the microwave radar detection will fail when the vehicle speed is slow, and the second is that the microwave radar equipment is complicated and expensive

[0010] But at present, audio vehicle detection is an emerging field. Domestic research is still in its infancy. Foreign products and equipment are complex and expensive. How to design a vehicle with excellent detection performance, strong anti-interference ability all-weather, easy construction, maintenance, and low price? Harmless audio vehicle detection devices are urgently needed

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