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Maker Media, Inc._Sound Mirrors Echo Obsolete Military Technology as Art Installation

http://makezine.com/2014/08/28/sound-mirrors-art-installation-echoes-obsolete-military-technology/

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independent.co.uk_Sound mirrors - the earliest form of air raid warning - unearthed on South Coast

http://www.independent.co.uk/news/science/archaeology/sound-mirrors--the-earliest-form-of-air-raid-warning--unearthed-on-south-coast-9821837.html

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YouTube_Sound reflecting mirrors

http://www.youtube.com/watch?v=K5k7GqG3psM

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YouTube_Sound Mirrors - BBC documentary

http://www.youtube.com/watch?v=84nK-M_40Uk

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上面的這些就是現今的 Parabolic Reflector Microphone 的應用與原理。

Google search_ Parabolic Reflector Microphone

https://www.google.com.tw/search?q=%E2%97%BEParabolic+Reflector+Microphone&client=firefox-a&hs=Mx9&rls=org.mozilla%3Azh-TW%3Aofficial&channel=fflb&tbm=isch&tbo=u&source=univ&sa=X&ei=K_NWVLvFEuK-mwWJjIH4AQ&ved=0CB0QsAQ&biw=960&bih=1419&dpr=1.25

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