Directional siren refers to a

siren Siren or sirens may refer to: Common meanings * Siren (alarm), a loud acoustic alarm used to alert people to emergencies * Siren (mythology), an enchanting but dangerous monster in Greek mythology Places * Siren (town), Wisconsin * Siren, Wisc ...

with a bandwidth broader than 500 Hz-1.8 kHz that enables listeners to more quickly locate the source of the sound. Generally,

sound localization Sound localization is a listener's ability to identify the location or origin of a detected sound in direction and distance. The sound localization mechanisms of the mammalian auditory system have been extensively studied. The auditory system us ...

accuracy is within 5 degrees, but enabling improved accuracy, for example in an ambulance siren, can lead to faster identification and response, thus enabling an

ambulance An ambulance is a medically equipped vehicle which transports patients to treatment facilities, such as hospitals. Typically, out-of-hospital medical care is provided to the patient during the transport. Ambulances are used to respond to medi ...

to reach its destination faster and increase the chance of saving lives. Other benefits of directional sirens are reducing the potential health threat to vehicle occupants, and reducing the risk of accidents from startled vehicles nearby the siren. Another benefit of a directional siren is

noise pollution Noise pollution, also known as environmental noise or sound pollution, is the propagation of noise with ranging impacts on the activity of human or animal life, most of them are harmful to a degree. The source of outdoor noise worldwide is ma ...

reduction, since the siren will be heard only by those who need to hear it."Noise Annoys". March 2008. ''The Journal of the Royal Society for the Promotion of Health'' Vol 128, No. 2

References

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more information
* Sound production Aerophones

See also

References

External links