Road vehicle is fitted with a detector that responds and identifies siren and alarm signals from an emergency services vehicle and warns driver

摘要

The microphone (M) responds to the siren or alarm of a vehicle and the signal is fed to a series of band pass filters (F1..n). These provide inputs to threshold switches (S1...n). Outputs are fed into a microcontroller (A) that identifies any signal that is a warning or alarm generated by an emergency services vehicle. The driver is given an optical (L) and audio (R) warning