Digital Public Address (PA) system are utilized in all public places attended by vast crowds of people like in underground and railway stations, on ships and in trains, airports, shopping malls, stadiums, exhibition halls, factory halls, schools, universities, theaters, office buildings, and conference centers. In daily operation such systems are not only used for information of the public or for providing a soothing ambience with sound in the area, but also for musical entertainment or for internal purposes like the communication among staff in widespread buildings (by live announcements or by intercom operation).

In cases of emergency such systems become particularly important: reliable alarming and acoustical guidance of crowds with people being directed to certain targets is absolutely necessary for the prevention of chaos and panic, so that organized scheduled evacuation can proceed as planned.

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