![]() In some cases, these terms are more precise, as there are various types and causes of echo with unique characteristics, including acoustic echo (sounds from a loudspeaker being reflected and recorded by a microphone, which can vary substantially over time) and line echo (electrical impulses caused by, e.g., coupling between the sending and receiving wires, impedance mismatches, electrical reflections, etc., which varies much less than acoustic echo). Echo suppressors were developed in the 1950s in response to the first use of satellites for telecommunications.Įcho suppression and cancellation methods are commonly called acoustic echo suppression ( AES) and acoustic echo cancellation ( AEC), and more rarely line echo cancellation ( LEC). In addition to improving subjective audio quality, echo suppression increases the capacity achieved through silence suppression by preventing echo from traveling across a telecommunications network. JSTOR ( January 2011) ( Learn how and when to remove this template message)Įcho suppression and echo cancellation are methods used in telephony to improve voice quality by preventing echo from being created or removing it after it is already present.Unsourced material may be challenged and removed.įind sources: "Echo suppression and cancellation" – news Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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