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- Echo_suppression_and_cancellation abstract "Echo suppression and echo cancellation are methods 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 quality, this process increases the capacity achieved through silence suppression by preventing echo from traveling across a network.These 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.g., coupling between the sending and receiving wires, impedance mismatches, electrical reflections, etc., which varies much less than acoustic echo). In practice, however, the same techniques are used to treat all types of echo, so an acoustic echo canceller can cancel line echo as well as acoustic echo. \"AEC\" in particular is commonly used to refer to echo cancelers in general, regardless of whether they were intended for acoustic echo, line echo, or both.Echo suppressors were developed in the 1950s in response to the first use of satellites for telecommunications, but they have since been largely supplanted by better performing echo cancellers.Although echo suppressors and echo cancellers have similar goals—preventing a speaking individual from hearing an echo of their own voice—the methods they use are different: Echo suppressors work by detecting a voice signal going in one direction on a circuit, and then inserting a great deal of loss in the other direction. Usually the echo suppressor at the far-end of the circuit adds this loss when it detects voice coming from the near-end of the circuit. This added loss prevents the speaker from hearing his own voice. Echo cancellation involves first recognizing the originally transmitted signal that re-appears, with some delay, in the transmitted or received signal. Once the echo is recognized, it can be removed by subtracting it from the transmitted or received signal. This technique is generally implemented digitally using a digital signal processor or software, although it can be implemented in analog circuits as well.ITU standards G.168 and P.340 describe requirements and tests for echo cancellers in digital and PSTN applications, respectively.".
- Echo_suppression_and_cancellation thumbnail Telephone_Echo_Canceller.png?width=300.
- Echo_suppression_and_cancellation wikiPageExternalLink echoBasics.html.
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- Echo_suppression_and_cancellation wikiPageExternalLink QSYS_AEC_Whitepaper_v2.1.pdf.
- Echo_suppression_and_cancellation wikiPageExternalLink topic01.asp.
- Echo_suppression_and_cancellation wikiPageExternalLink en.
- Echo_suppression_and_cancellation wikiPageExternalLink en.
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- Echo_suppression_and_cancellation wikiPageExternalLink echo-cancellation-art-or-science-part-v.
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- Echo_suppression_and_cancellation wikiPageRevisionID "703946360".
- Echo_suppression_and_cancellation wikiPageWikiLink AT&T.
- Echo_suppression_and_cancellation wikiPageWikiLink Adaptive_filter.
- Echo_suppression_and_cancellation wikiPageWikiLink Attenuation.
- Echo_suppression_and_cancellation wikiPageWikiLink Attenuation_distortion.
- Echo_suppression_and_cancellation wikiPageWikiLink Audio_feedback.
- Echo_suppression_and_cancellation wikiPageWikiLink Bell_Labs.
- Echo_suppression_and_cancellation wikiPageWikiLink Bridge_tap.
- Echo_suppression_and_cancellation wikiPageWikiLink Category:Communication_circuits.
- Echo_suppression_and_cancellation wikiPageWikiLink Category:Telephony.
- Echo_suppression_and_cancellation wikiPageWikiLink Chorus_effect.
- Echo_suppression_and_cancellation wikiPageWikiLink Clipping_(signal_processing).
- Echo_suppression_and_cancellation wikiPageWikiLink DMS-100.
- Echo_suppression_and_cancellation wikiPageWikiLink DSL_modem.
- Echo_suppression_and_cancellation wikiPageWikiLink Decibel.
- Echo_suppression_and_cancellation wikiPageWikiLink Digital_signal_processing.
- Echo_suppression_and_cancellation wikiPageWikiLink Digital_signal_processor.
- Echo_suppression_and_cancellation wikiPageWikiLink Double-talk_(telephony).
- Echo_suppression_and_cancellation wikiPageWikiLink Echo.
- Echo_suppression_and_cancellation wikiPageWikiLink Feedback.
- Echo_suppression_and_cancellation wikiPageWikiLink G.164.
- Echo_suppression_and_cancellation wikiPageWikiLink G.165.
- Echo_suppression_and_cancellation wikiPageWikiLink ITU-T.
- Echo_suppression_and_cancellation wikiPageWikiLink Impedance_matching.
- Echo_suppression_and_cancellation wikiPageWikiLink Least_mean_squares_filter.
- Echo_suppression_and_cancellation wikiPageWikiLink List_of_ITU-T_V-series_recommendations.
- Echo_suppression_and_cancellation wikiPageWikiLink Local_loop.
- Echo_suppression_and_cancellation wikiPageWikiLink Loudspeaker.
- Echo_suppression_and_cancellation wikiPageWikiLink Modem.
- Echo_suppression_and_cancellation wikiPageWikiLink Nortel.
- Echo_suppression_and_cancellation wikiPageWikiLink Public_switched_telephone_network.
- Echo_suppression_and_cancellation wikiPageWikiLink Sidetone.
- Echo_suppression_and_cancellation wikiPageWikiLink Signal_loss.
- Echo_suppression_and_cancellation wikiPageWikiLink Signal_reflection.
- Echo_suppression_and_cancellation wikiPageWikiLink Silence_suppression.
- Echo_suppression_and_cancellation wikiPageWikiLink Software.
- Echo_suppression_and_cancellation wikiPageWikiLink Speakerphone.
- Echo_suppression_and_cancellation wikiPageWikiLink Squelch.
- Echo_suppression_and_cancellation wikiPageWikiLink Telecommunications_network.
- Echo_suppression_and_cancellation wikiPageWikiLink Telephone_exchange.
- Echo_suppression_and_cancellation wikiPageWikiLink Telephony.
- Echo_suppression_and_cancellation wikiPageWikiLink Videoconferencing.
- Echo_suppression_and_cancellation wikiPageWikiLink Voice_activity_detection.
- Echo_suppression_and_cancellation wikiPageWikiLink Voice_engine.
- Echo_suppression_and_cancellation wikiPageWikiLink Voice_over_IP.
- Echo_suppression_and_cancellation wikiPageWikiLink File:Telephone_Echo_Canceller.png.
- Echo_suppression_and_cancellation wikiPageWikiLinkText "Echo cancellation".
- Echo_suppression_and_cancellation wikiPageWikiLinkText "Echo suppression and cancellation".
- Echo_suppression_and_cancellation wikiPageUsesTemplate Template:Citation_needed.
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- Echo_suppression_and_cancellation wikiPageUsesTemplate Template:Further.
- Echo_suppression_and_cancellation wikiPageUsesTemplate Template:Refimprove.
- Echo_suppression_and_cancellation wikiPageUsesTemplate Template:Reflist.
- Echo_suppression_and_cancellation subject Category:Communication_circuits.
- Echo_suppression_and_cancellation subject Category:Telephony.
- Echo_suppression_and_cancellation hypernym Methods.
- Echo_suppression_and_cancellation type Software.
- Echo_suppression_and_cancellation type Circuit.
- Echo_suppression_and_cancellation type Redirect.
- Echo_suppression_and_cancellation comment "Echo suppression and echo cancellation are methods 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 quality, this process increases the capacity achieved through silence suppression by preventing echo from traveling across a network.These methods are commonly called acoustic echo suppression (AES) and acoustic echo cancellation (AEC), and more rarely line echo cancellation (LEC).".
- Echo_suppression_and_cancellation label "Echo suppression and cancellation".
- Echo_suppression_and_cancellation sameAs Q365756.
- Echo_suppression_and_cancellation sameAs Echokompensation.
- Echo_suppression_and_cancellation sameAs エコー除去.
- Echo_suppression_and_cancellation sameAs Эхоподавление.
- Echo_suppression_and_cancellation sameAs Q365756.
- Echo_suppression_and_cancellation sameAs 回音消除.
- Echo_suppression_and_cancellation wasDerivedFrom Echo_suppression_and_cancellation?oldid=703946360.
- Echo_suppression_and_cancellation depiction Telephone_Echo_Canceller.png.
- Echo_suppression_and_cancellation isPrimaryTopicOf Echo_suppression_and_cancellation.