Um estudo sobre o cancelamento de eco acústico em ambientes não-estacionários
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(43) í öѳÉ÷ ¶. ¹. WQ?Bi?B[QWS?WQLö]_?UCVL_AWQ? I L}?` I :=?`[fCV?B<[SLY:=[Q<DCFEM[fC@?EKCVOQEMd/£ ¬Öh U|pWQLö]KEMd=LMAcWQLö?BA@A>L Y>Öh ?WSL<@:=[QEMd7WQ?A>?`?`A?B [ I :{E ¬Öh iQA>L]_?B[S:=?B[fC@?sWSLoOS<@OkEMw A>:=L ¢ I L_[Q<>CVEM[fCV?qÕ ? w LTiaEK<@<@LoWQ?sEMWaEKiSCFEHIKG EMJ LNWQLTEMd=q_LMA@:^C@RTLS¢ I EMRo:=[QvSL WS?o? I L/A@?BiSA@?B<>?B[fCFEKWQLöi?Bd=Ev w PQA>:=WaEî?Mw |&[aEiQAQEKw CV: I ES|PaEK<>CFEK[mC@?o]KEÆ A@:EÆw ]_?Bdª|WQ?`iH?`[QWQ?`[QWQLQ|kWQ?`[mC@A@?/L_OSCVA>L_<N(EKCVL_A>?B<`|hWaEM< I EMA@E I C@?BABw <>C@: I EM<TWQEývw PQA@:^WaEè? WQL/Ro?B:^LWQ?CVAVEK[Q<@Ro:=<>< EMJ LQ¢o¬L_Aj?B<@<@E/A@,E EMJ LS|¬Lad¤CVA@LEKWaEMiSCVEKCV:¤]_L WQ?`]M?T<>?BA I EMiaE WQ?oE>OQ<>CVEMAL_< I L?U I :^?B[fCV?`<s<>L_P I L_[QWS:>IMG LMJ ?B<;]KEMA@:=EMWaEM<`|?BRPHL_A@E:=<><@L[ EMJ L:^RTiQd^:=lmOQ? [Q? I ?B<@<@EMA@:=EMRo?B[fCV?ýlmOQ?èL4Qd^CVA>L4EMWaEMiCFEKC@:^]_LôC@AVEMPQEMd=vaEKAaEôw ?BR OQR EMRPQ:=?`[mC@?0[ EMJ LK ?B<>CVE I :^L_[kEMw A>:=LQ¢ót8R :=RoiQd^?BRo?B[fCFEHIKG L_J ?B<oiQAQEKw CV: I EM<`|hiaEMA@E lmOQ?öLê? I L CV?Bd^?` L_ [S: I Lý<@?È@E I EM[ I ?Bd=EMWQL%WS?cRoLWSLT<@EKCV:^<>(EKCaL_w A@:^Lz?jw [Q? I ?`<@<aEKw A@:=L%l}OS?LNad^C@A@LTEMWaEMiSCVEKCV:¤]_LQ|~EKdU?Bw R2WS? I L_[Q<>?Bq_OS:=ARoLWQ?`d{EMA\WQ?RoLWQLEMWQ?BlmOaEKWQL/?<>OS I :=?B[fC@?oL I EMRo:=[QvQL%WQ?? I L qM?BAVEKWQL iH?`d{E0vw PSA@:=WQES|8iHLM<@<@OQEèOSR I L_RoiQA>:=Ro?B[fCVLYWS? A>?B<>iHL_<DCFEýEML0:=RoiQOQd^<@L0lmOQ?<@?È@E0[QL Röw [Q:=RoLNR%EM:^L_AnlmOQ?LT? I L%R%EM:^<kd=L_[QqMLTiQA>?B<>?B[fCV?[QL%<@:=<DCV?`R%ES¢k¬L_A½?¹×?BRoiQd=LQ|<@?cL ad^C@A@LsEMWaEMiCFEKC@:^]_LjiL_<@<>OQ: Á I L}?` I :=?`[mC@?B<·?kLci?BABw L}WQLWQ?áEMRoL_<>C@AVEMq_?`R.WQLs<@:^<>C@?BRTE /? w Âvù|f?B[fC EMJ LjLj? I LjR%EM:^<³d=LM[Qq_LQ|_WS?`a[Q:^WQL I L_Ro L Ä0Å(|flmOQ?kiLWS?BAaEw <>?BA I EM[ I ?Bd=EMWQLj?` I :¤ ?B[fCV?`RT?`[mC@?\i?Bd^Lad^C@A@L<@?`AaEjw WQ/? Ä0ŦÆÇÁÈÂvó<@?`q_OQ[QWSL_<B¢ut8<@<>?á(EÆCVLiLWQ?k<>?BAu:=d^OQ<>C@AVEMWQL iHL_A\OQR ?U×?BRoiQd=L<>?BRo?Bd^vaEM[fCV?EMLEMiQA>?B<>?B[fCFEMWSL ?`âR # %ª¢ CVEÆ×SEWQ?EMRoL_<>C@AVEMqM?BR I L_ROSRT?`[mC@?OSC@:=d^(: ÔEKWaEiaEMAVEo<@:^[aEM:=<kWQ?s]_<L c[aEM<\A@?BWS?B<½WS?cCV?`d=?UL_[Q:{Eô?sw WQÉ? ¹Ó BÈM|H? <@?B[SWQLöEK<@<@:^R/|HLiH?`AÔw LWQL%WQ?NEMRoL_<>C@AVEMq_?`R WSL<@:=<DCV?`R%E?w WQEMWQLiL_AA ÂvÃp < ÊÉ<B¢ e?EYA@?`<@iL_<>CVE0EMLY:^RTiQOSd=<@L WQL I EMRT:^[QvQL/WQ?? I LYCV:¤]_?BA I L_RoiQA>:=Ro?B[fCVL/WQþ? MöRo<B| iHL_A½?U×?BRoiQd=LS|<@?`AaEw [Q? I ?B<><aEMw A>:=L?B< I L_d^vQ?BAOQRâad¤CVA@LEKWaEMiSCVEKCV:¤]_L I L_ROQR [½OQw Ro?BA>L WQ? I L}?` I :=?B[fC@?Bp< Á3CVEMdlmOQ?j<VEKC@:=<D(EHI G E Á < ÉY< Ë[M8Ro< L_O/<>? @ES|aOSR ad^C@A@L I L_R ÁÌË L _ I L}?` I :=?B[fC@?B<.
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(45) í öѳÉ÷ ¶. . e LMRT?`[mC@? I L_RâOQR2ad^C@A@LEKWaEMiSCVEKCV:¤]_LoWQ?B<DCV? I L_RTiSA@:=Ro?B[fC@L%<@?`AaE%w iL_<><Ôw ]M?Bd I EM[} I ?Bd=EMAn<VEÆCV:=<D(EKCVLMA@:{EKRT?`[mC@?;Lo? I LoWQ?`<>CV?j<>:=<>C@?BRTES¢ I EMRo:=[QvQLnWS?Ý? I L½?`R I :^A I OS:^CVLM<CV?Bd^?`L_ [S: I LM<CFEMRPÝ?Bw R EMiSA@?B<>?B[fCFE½Eá:^RTiL_A>CVEM[fCV? I EMA@E I C@?BABw <>C@: I EWQ? 83IZ5 *,JID;>=*=?8U|:Т ?M¢¤|QlmOaEM[QWQLNOQRTEq_AVEK[QWQ?iaEMADCV?WQLM< I L?U I :^?B[fCV?`< WaE%A@?`<@iL_<>CVEEML:^RTiQOSd=<@LTE%<>?BA;RoLWS?Bd{EKWaEo< EMJ Li?BlmOQ?`[QL_<?EKiH?`[aEM<EMd^q_OQ[Q< I L}?` I :=?`[fCV?B<iHL_<><@OQ?`R EKRTiQd^:^C@OQWQ?B<·<@:^q_[Q:¤ I EKC@:^]KEM<`| I L_RoLiLWS?½<@?`AÝ]}:=<DCVL[QEbp:^q_OQAVE ¢ L iaEMAVEzEôA>?B<>iHL_<DCFE Í>Öû T?BR OQR%E d=:=q_EHIMG EMJ LýCV?`d=?` LM [Q: I ES¢ I EM[ I ?Bd{EKRT?`[mC@LzWQ?0? I L ?BR I EK[aEM:=<u?`<@iaEMA><@L_<ÝiHL}WQ?á<@?`AÝA>?ÔEMd^(: ÔEKWQL I L_R EKd=q_L_ADCV:^RTL_<³EMWaEMiSCVEKCV:¤]_L_<u?`<@i? I :¤ I E RT?`[mC@?jWQ?B<>?B[f]_L_d¤]}:=WQL_<kiaEKAVECFEK:=<h<>:^CVOQEHIMG L_J ?`<B| I L_RTLLM<kEMiQA@?`<@?`[mCVEMWQL_<k?`R # &%ª| # ·&%Ð| # M& %Ð| # %ª| # _& %ª¢0t8<@<@?`<oEMd=q_LMA@:^C@RTLM®< ÎjOSCV:^d=: ÔEMR3?`<>CVA@EKC?`w q_:{EK<iaEMA@Eö:=WS?B[fCV:¤ I EMAcWQ?B[} CVA@L/WaE/A>?B<>iHL_<DCFE/EMLö:^RTiQOSd=<@LL_< I L}?` I :=?`[fCV?B<R%EM:^<<@:^q_[Q:^ I EKC@:^]_LM<s?%EMlmOQ?Bd^?B<slmOQ? iHL_<><@OQ?`REKRTiQd^:^C@OQWQ?B<WS?B<@iSA@? Mw ]M?B:=<`|³<@?`q_OQ[QWSLYEMd^q_OQR I A@:^C?Bw A>:=LiQA@?U]}:{EMRo?B[fCV?o<@?`d=?¹ I :=LM[aEMWQLQ¢ ikL_w <á?B<><VE%:^WQ?B[fC@:^ I EHIMG EMJ LS|<>L_Ro?B[fCV?s< EMJ L%EMWaEMiCFEMWQLM<\L_< I L}?` I :=?`[fCV?B<\lmOQ? I L_[fCVA>:=PQOS?BRWQ?LMA@RTEöA@?`d=?`]KEM[fC@?iaEMAVE I EMAVE I CV?`A@: ÔEMAEYA>?B<>iHL_<DCFEèEMLè:=RoiQOQd^<@L/WQL <@:=<DCV?`R%EjWQ?B< I L_[SvQ? I :=WQLQ¢ <@<>:=R |8?kw iL_<@<Bw ]M?Bd~A@?`WQ O B:^AE I LMRTiQd^?U×:=WQEMWQ? I LMRTiQOCFE I :=LK [aEMd~WQLsiQA@L I ?`<@<@LS|SLsl}OS? ?kw PaEM<DCFEM[fCV?\WQ?B<>? QEKw ]M?BdiaEMA@EsL_<·<@:^<>C@?BRTEM<uWQ? I EM[ I ?Bd{EKRT?`[mC@L WQ?T? I LQ|EMdU?Bw RxWQ?oRo?Bd=vSL_AVEMA½L/WQ?`<VE>OS<>CV?TL_PSC@:=WQLi?Bd=L/EMd^q_L_A@:¤CVRoLQ|H]}:^<>CVL lmOQ?o?B<>C@? CFEMRPÝ?Bw R ?jw iQA>L_iHLMA I :^L_[aEMd7EMLN[;OQw Ro?BA@LNWQ? I L?U I :^?B[fCV?`<\WQLad¤CVA>LQ¢ ñ Ð ø ? h Ï ðêþu ÿ hD þ
(46) ¬
(47) ÿ æ h ? I L%E I OQw <>C@: I L?B<>CaEow iSA@?B<>?B[fCV?s?BR <@:=<DCV?`R%EM<nWS?jC@?Bd^? I LM[S?BA ?B [ I :{E?CV?Bd^?`L_[S:{Ec]}:^]KEÆ ]_<L K|p?oL_A@:^q_:=[aEÈ<@?E iaEKA>CV:^AjWaE A>W? ìa?¹× EMJ LöWaEK<cL_[SWaEM<s<@L_[QLMAVEM<j[aEM<siaEMA>?BWQ?`<WQ?oOQR EMRPQ:^?B[fCV?n?hWSLcE I L_iQd=EMRo?B[fCVLE I OQw <>C@: I L;?B[fCVA>?kOQR*EMd¤CVLKÐ(EMd{EK[mC@?u?nOQR.Ro: I A@LML_[S?M¢ bp:=q_OSAVE ¸¢ jEKiQA@?`<@?B[fCVEcOQRTE<@:^C@OaEHIKG EMJ LcqM?B[Ý?`w A@: I EWQ? I EM[ I ?Bd{EKRT?`[mC@LjWQ?\? I LcE I OQw <DCV: I LQ| I L_RoLiHL_Aj?¹×S?`RTiSd=LQ|?`R3OQR%E I L_[f]_?BA><VEHIKG EMJ LöWSL C@:=iL]}:¤]MEÎ]_,L M¢oZ\R3EKd^CVLÆÎ(EMd=EM[fCV? ? OSRRo: I A>LML_[Q?%< EMJ L I LMd=L I EMWQLM<?BROSREMRPS:=?B[fC@?? I vaEMWSoL ?M¢ qQ¢ô<VEKd{ES| I EMPQ:=[S? Ñ-Òg1 > 57,,-%+*(,-%¦.LI]Ó01L57'O*7#/10%9QKRÀ·HE,-Ô 6?2g'M,¸ R.
(48) K. í ³î ²µ ï °dð ¶òñ<ó{µôbïd´¶ õ °
(49) í öѳÉ÷ ¶ h(n). n Região com baixa energia. bp:=q_OSAVE ¢ L Ø Õd"e bPe ` bZ)h _P)e"bd"e }Ek \7e k gn b«^ k h/Z q uKb«n3d¦dt^"b·4d\ k n3b } "d k ¦u ax i y \(Zmn k dh¿_Ph k \d®ngd `dBdsrb q Zl^ k z } kk } WQ?TOSR I EMA>A@LY ;WQ?L_A>R%ElmOQ?o?B<DCV?È@EMR3?BR!E I L_iQd=EMRT?`[fCVLE I OSw <>CV: I LQ¢ot8Rxq_?`AVEMdª|L E I L_iSd{EMRo?B[fCVL E I OQw <>C@: I L?`[mC@A@?oL/Ro: I A@LMLM[Q??NLöEMd¤CVLKÐ(EMd{EK[mC@?<@?NWkEw CFEK[mC@L/WS:=A@?UCFEÆ RT?`[mC@?lmOaEM[fCVLoEKC@AVEÔ]u?Bw <nWQ?OQR6q_AVEK[QWQ?;[½OQw Ro?BA>LWQ? I EMRT:^[QvQL_<ÝWQ?? I L I A@:=EMWQL_<iHL_A A@W? ìQ?U× L_J ?B<cWQL<@L_R[aEM<jiaEMA>?BWQ?`<cWQL EMRPQ:=?`[mC@?M¢ A@?`<@iL_<>CVE/EKL :^RTiSOQd=<>LA@?U]_?BA>PH?¹ AVEM[fCV?jWaE<@EMd{EiLWS?<@?BAh]}:^<>CFE I L_RTLOSR%E<@?`l ûO ú ?B [ I :{EWQ?:=RoiQOQd^<@L_<OQ[pIKG L_J ?B<kWQ?`d^CVE YÖB>Öª ? kWQ?B<>d=L I EMWSL_<;[QLC@?BRoiHLQ| I LMREKC@AVEM<>×L iQA@L_iL_A I :=LM[aEMdhE%X WQ:^<>C EK [ I :=E%q_?U L_R4?Uw CVA>: I EnWQLáA@?`<@i? I CV:^]ML I EKRT:^[QvQLkWQ?·? I LS¢ EMRoiQd=:¤CVOQWQ?pWQ?B<DCV?B<p:=RoiQOQd=<>L_<½?8w OQ[pIKG EMJ L WQL I L_RoiQA@:^RT?`[fCVLWQL I EMRT:^[QvQLWS?o? I LQ|lmOQ? I EMOQ<VEEKC@?B[mOaEHIKG EMJ LWQL<@L_R A@D? ìa?`C@:=WQLQ| >OQ[fCFEMRo?B[fCV? I L_R2EA@D? ìa?`C@:^]}:=WaEKWQ?WaEM<niaEKA@?BWS?B<áWQLoEMRPQ:^?B[fCVÓ? # %ª¢ ? I LTqM?BAVEKWQLz? w ?B[f]}:{EMWQLoWQ?]_LMd^CFENEML:^[fCV?BA>d=L I OSC@L_AhWQ:^<>CVEM[fCV?sEKCVA@EÔ]u?`w <kWQLTRo: I A@LMLM[Q?M|iH?`A>CVOSA@PaEM[SWQL Eo:^[mC@?Bd^:=q_:^PQ:=d^:=WaEMWS?nWaEo:^[SL_A>R%EHIKG EMJ LQ¢ CV?BRoiLýWS?/A>?`]_?`A@P?BA@EHIMG EMJ SL ØWQ?OQRTE0<VEMd=Eû?w C@:=iQ: I EMRo?B[fCV?WQEèLMA@WQ?`R WQ? EMd¤ q_OQRTEM< I ?`[mC@?B[aEK</WQ?èRo:=d^:=<@<>?B[QqMOQ[QWQL_<`|k?B[QlmOaEM[fC@LîlmOQ?è[QL I EM<>LWQEM< I EMPS:=[Q?`< WS? EMOSCVLMR LMw ]M?B:^<B|m?B<><@?\C@?BRoiHLsWQ:^RT:^[}OS:SiaEMA@EcEKiH?`[aEM<ÝEMd=q_OSR%EM<8WS? B?`[aEM<ÝWQ?\Ro:=d^:=<><@?BqMOQ[ WQL_<B¢ b:=q_OQA@E ¸¢ oRTL_<DCVA@ETA@?`<@iL_<>CVEM<;EKL%:=RoiQOQd^<@LNCw iQ: I EM<kiaEMAVETL_<\WSL_:=< I EM<>L_<B|7E Ù *7, #/HK1 2g,95(,-QL,-5 , 5.ÛMLÚ .Pº 1?8®M:?.P#o.02g1·2g,9ÜÞÝ(ßL8[,$< 1*7, #/HK1·64,®M,-%7%S.P< 57']1HS.P5.C ,$1 %+10# 24, 6G*(571 42 1.P# > '), 6G*(,·M-.P'. àLá024¸> , #â5(,-I).EMPÚ .Lº 1.L1«%(, F Qr.PI)1L5$1L57']Ó0']6?.LImRUã.P5.M .L6?M,-I).L59%7.r*('F %+@l.r*(105('.P#/,-60*7,¦1 ,®M1YM 5('.L2g1/,-# F #Ç.P# > '],-6G*(,L8v,< H45(,®M'%+1oC F ,1YM 1L#/H457']#/, 6G*71/241/¾?IO*75(1o.024.PHg*.r*7']Q01/M-.P6?M , I.L2g105 %(,ä½+./6?1#µ=< 64')#/1')Ó F .PIE.P1*(,-#/HS1Y2g,57, Q0, 5 > ,-57.EMPÚ .Lº 1Wå ærçaR.
(50) . í ³î ²µ ï °dð ¶òñ<ó{µôbïd´¶ õ °
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