Echo

The result of a reflection of sound that arrives at the listener after the direct sound with a delay.

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 directly 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.

image
Echo
resources
  • How To Install Acoustic Foam Panels w/ NO ECHO - Home Theater Sound Treatment Setup BEFORE and AFTER on youtube.com
  • Dealing with an echoing conference room? on kireiusa.com
  • What Is Flutter Echo And How Does It Apply To Room Acoustics? on acousticfields.com
  • Echo suppression and cancellation on wikipedia.org
  • Room acoustics guide on crutchfield.com
source
Adapted from content published on wikipedia.org
credit
  • Image By Hannes Grobe, Alfred Wegener Institute for Polar and Marine ResearchCitation: Hannes Grobe/AWI - Own work, CC BY-SA 2.5 — from wikimedia.org
Last modified on December 14, 2020, 8:48 am
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