# Directional siren

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{{Short description|Type of alert siren}}
A '''directional siren''' is a [siren](/source/Siren_(alarm)) with a bandwidth broader than 500&nbsp;Hz-1.8&nbsp;kHz that enables listeners to more quickly locate the source of the sound. Generally, [sound localization](/source/sound_localization) 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](/source/ambulance) to reach its destination faster and increase the chance of saving lives.<ref>Withington, Deborah. (2000). "The Use of Directional Sound to Improve the Safety of Auditory Warnings." ''Proceedings of the IEA 2000/HFES Congress'', 3, p. 726-729</ref> 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](/source/noise_pollution) reduction, since the siren will be heard only by those who need to hear it.<ref>"Noise Annoys". March 2008. ''The Journal of the Royal Society for the Promotion of Health'' Vol 128, No. 2</ref>

==See also==
* [Siren (alarm)](/source/Siren_(alarm))
* [Sound localization](/source/Sound_localization)

==References==
{{reflist}}

==External links==
* [http://www.directionalsirens.com/ more information]

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Category:Sound production
Category:Aerophones

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Adapted from the Wikipedia article [Directional siren](https://en.wikipedia.org/wiki/Directional_siren) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Directional_siren?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.