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In audio signal processing and acoustics, echo is a reflection of sound that arrives at the listener with a delay after the direct sound. The delay is proportional to the distance of the reflecting surface from the source and the listener. 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 word echo derives from the Greek ἠχώ (ēchō), itself from ἦχος (ēchos), "sound". Echo in the folk story of Greek is a mountain nymph whose ability to speak was cursed, only able to repeat the last words anyone spoke to her. Some animals use echo for location sensing and navigation, such as cetaceans (dolphins and whales) and bats.

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    Stihl, Husqvarna, or Echo Chainsaw?

    I'm looking at buying a new chainsaw and want at least an 18" maybe 20" bar. I'm at looking $350/$400 for a new one. Which brand/model would you get? I don't cut up cord after cord, but I will soon be faced with a lot of 10"/12" oak tree limbs resulting from pruning, plus this winter I'll be...
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    Oregon  Fostech Echo trigger illegal in Oregon?

    So I was just looking at the page on Fostech's website for their Echo trigger which fires on the pull and release. Then I noticed that they are listing Oregon as one of the states they cannot ship to. This came as a total surprise to me. Can somebody clue me in as to what law it is that makes...
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