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Acoustic mirror
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An acoustic mirror is a passive device used to reflect and focus (concentrate) sound waves. Parabolic acoustic mirrors are widely used in parabolic microphones to pick up sound from great distances, employed in surveillance and reporting of outdoor sporting events. Pairs of large parabolic acoustic mirrors which function as "whisper galleries" are displayed in science museums to demonstrate sound focusing.
4.5-metre-high (14 ft 9 in) WW1 concrete acoustic mirror near Kilnsea Grange, East Yorkshire, UK. The pipe which held the "collector head" (microphone
4.5-metre-high (14 ft 9 in) WW1 concrete acoustic mirror near Kilnsea Grange, East Yorkshire, UK. The pipe which held the "collector head" (microphone) can be seen in front of the structure
Acoustic mirrors at RAF Denge
Acoustic mirrors at RAF Denge
A parabolic whispering dish that's part of an installation at Jodrell Bank Observatory.
A parabolic whispering dish that's part of an installation at Jodrell Bank Observatory.
A pair of smaller acoustic mirrors in a park in Muiderberg.
A pair of smaller acoustic mirrors in a park in Muiderberg.
Whispering gallery
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A whispering gallery is usually a circular, hemispherical, elliptical or ellipsoidal enclosure, often beneath a dome or a vault, in which whispers can be heard clearly in other parts of the gallery. Such galleries can also be set up using two parabolic dishes. Sometimes the phenomenon is detected in caves.
The Whispering Gallery of St Paul's Cathedral, London
The Whispering Gallery of St Paul's Cathedral, London