Siren detection system for placement at traffic intersection

摘要

A traffic control system comprises a control unit and a plurality of speakers each configured to function as a microphone and having a DC resistance in the range of 20 to 30 ohms. The control unit monitors the DC resistance of each speaker and communicates malfunctions to a 24 hour emergency dispatch center which contacts repair personnel. The control unit also compares the frequency pattern of a siren to ambient noise at an intersection to distinguish siren sound from ambient noise.