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LPS22HBTR_哪种好本文导读:insteadgeneratingcomfortnoisetoensurethatthelinedoesnotappeardeadwhennooneistalking.InastandardPSTNtelephonesystem,echoesthatdegradeperceivedqualitycanhappenforavarietyofreasons.Thetwomostcommoncausesareimpedancemismatchesinthecircuit-switchednetwork(lineecho)andacousticcouplingbetweenthemicrophoneandspeakerinatelephone(acousticecho).Lineechoesarecommonwhenthereisatwo-wire-to-four-wireconversioninthenetwork(e.g。
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LPS22HBTR_哪种好ofcourse,delayedanddiminishedinamplitude.Toachieveeffectivecancellation,itusuallysufficestouseastandardcorrelationwindowsize(e.g,32ms,64ms,or128ms),butlargersizesmaybenecessary.EmergingandCurrentVoIP-BasedApplicationsBecausethehigh-speednetworkasawhole(ratherthanadedicatedchannel)isusedasthetransportmechanism。
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LPS22HBTR_哪种好andthepayloadcontainsthecompressedvoicedata.Whilecircuit-switchedtelephonydealswiththeentiremessage,VoIP-baseddatatransmissionispacket-based,sothatchunksofdataarepacketized(separatedintounitsfortransmission)。
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