A reversing alarm for a vehicle emits an audible signal in the form of pulses
of
broad band sound when the vehicle is put into reverse gear. The broad band sound
allows persons in the vicinity to locate the vehicle, as the human brain is able
to process broad band sound to pinpoint the location of the sound source in a way
which is not possible with single tone sounds. The alarm is implemented via a simple
electronic circuit which uses a zener diode as a signal generator 20 to
generate the broad band sound.
