Vehicle Detection using Audio Signal Processing

Vehicle detection using audio signal processing

AI has now progressed to the stage where it is possible to locate vehicles and track their movements from real time video captures. However, Alumnus was presented a problem where video cameras were unavailable, and installation of a huge number of cameras along the highway was prohibitively costly. Instead vehicle movement had to be tracked from audio signals.

Microphones were placed about 5 m apart in a highway. Alumnus used their recorded stereo audio signals to determine the vehicle size (i.e. cars or mid-sized trucks or buses / trolleys) and their direction of movement.

Use of frequency domain computations like short term FFT, convolution, correlation and filtering, along with determination of audio energy levels was used to solve this problem satisfactorily.

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