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Solar Energy Thesis Statement
Echo 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. 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. Echo suppressors were developed in the s in response to the first use of satellites for telecommunications. Echo suppression and cancellation methods are commonly called acoustic echo suppression AES and acoustic echo cancellation AEC , and more rarely line echo cancellation LEC. 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.