ISSN:
1741-0444
Keywords:
Aurally handicapped
;
Alarm monitor
;
Driving
;
Electronic aid
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02442823
Permalink
