| 摘要 |
<p>A reversing alarm (16) 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 (16) is implemented via a simple electronic circuit which uses a zener diode as a signal generator (20) to generate the broad band sound.</p> |
