Abstract
There are several countries in the world in which people with severe hearing loss are not eligible for a car driver’s licence. As a technical approach to solve this problem, an electronic device has been developed which detects traffic-alarm sounds, i.e. horns of cars, sirens of emergency vehicles, and alarm signals of railway crossings, and then displays them as a light signal to the driver. The basic operating principle of the device is that those traffic-alarm sounds have sharp line spectra in the frequency domain whereas ambient traffic noise is wide-band random noise. The real time detection of the line spectra, masked by random noise, is realised by use of a phase-locked loop and a simplified lock-in amplifier. The results of simulation experiments and road tests demonstrate that the performance of the device is satisfactory except in the case of the detection of the alarm signal of a railway crossing.
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