Echo
From The Art and Popular Culture Encyclopedia
(Redirected from Echo (phenomenon))
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We three, we're all alone --"We Three (My Echo, My Shadow and Me)" (1940) by the The Ink Spots |
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In audio signal processing and acoustics, an echo (plural echoes) is a reflection of sound, arriving at the listener some time after the direct sound. Typical examples are the echo produced by the bottom of a well, by a building, or by the walls of an enclosed room and an empty room. A true echo is a single reflection of the sound source. The time delay is the extra distance divided by the speed of sound. The word echo derives from the Greek ἠχώ (ēchō), itself from ἦχος (ēchos), "sound".
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Famous echoes
- Gol Gumbaz of Bijapur, India: Any whisper, clap or sound gets echoed repeatedly.
- The Golkonda Fort of Hyderabad, India
- The Echo Wall at the Temple of Heaven, Beijing, China
- The Whispering Gallery of St Paul's Cathedral, London, England
- Echo Point, the Three Sisters, Katoomba, Australia
- The Temple of Kukulcan ("El Castillo"), Chichen Itza, Mexico
- The Baptistry of Pisa, Pisa, Italy
- The echo near Milan visited by Mark Twain in The Innocents Abroad
- The echo in Chinon which is used in a traditional local rhyme.
Unless indicated otherwise, the text in this article is either based on Wikipedia article "Echo" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on research by Jahsonic and friends. See Art and Popular Culture's copyright notice.
