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iompurud to nlult~plc \,brator r\rscpr. hut DS4 ttwlr xu no! yet thh tcchntc&ll) dd\.~nccd<br />
Fonunztuly. (lie v~uri.c ,Ipnuturr'dcr~\ed from d \~hrator source .,I .L tixed risldci. locat~ol, ~r<br />
rclic8\r.l? cmn\i\lcnr Ihmm one toul dcpth to thu nc\t In compartron. rhi. SSP rcpalhc ~h.n I*<br />
uaud to compare lo tile LSP rcrponrc IS d~.r~(~.d lion, iilnoll\ ,~rf.~~.e Itlc~llm~\ .!nd \hol<br />
i.a~id~tion\<br />
tor \ SP. ;m.~l!s>s of ~h; :i'n$c~l ;omprcsaional aa\:!iuld ~n:ol;c\ rr.>ci. ;dmr,g<br />
2nd pol.trlir corrcctlnn\ heliwe an) fir-( hierh p~cktng The [prd-pru~e\scd ~cwrd\ 1n1.1)<br />
rr.qt~~rc 5upprcwon nixfi.~ctnl r'nr'rgy thdr i-m rnd4 ~hr. dorm-galnp n.nc. hut pcn~.nll)<br />
lint mt\.tlr rcprc\cnt dtm~1 path\ lilr it h~r!,c~ntillly Inycr~d model dnd \nlilll Y)UTCC-~U-<br />
rcccncr lalr.rdl olfl~l.tt~. \cp.$r.bkh!n<br />
dusl.i.oiny ~on>pre\v~,n.il cbcntr trunl up-goins ~'ncrs) l'hu cirluallon c~f llic ~cpa~.~f~o#~<br />
lpnlcarr tmay hc ~mpnncd by fin1 arlvnu.br#n~ my cohcrcnl nolre cncrs)<br />
ISP pmcca.~np ercalur ainalicld~ llvat arc ~.xpmsscd tn tcnn, ~>fd~f&r~)nr lune ctl-<br />
ord~nxrr. or rnmc liomcr Flgun. 31.1 lluitl rIw\\r thl llw drrliill tlrna, tilr lhc do\\a-po~~p<br />
aa\uficld ad1 ~ncrvilre da thu deplll of rvcarer 8ncrr.rrer. On Ihu othur Ihmd. up-po~ns<br />
rcll~ct~on umc\ lion) ;I \uhrurl:ru harrlnm ail1 Jccru;i*r. \rrtll incrc;Luiip rcccncr depth \cni.c<br />
111~. TCL.EIYC~ 11 mo\lngclorer a, !he tr.llccrui. In liuld record rtmc (FRI'l. ch,an-+unp<br />
comprusrion an\als habe uppoallu tlmedlp from up-gum$ etcna SUi.gCrtlng lhi: urc nf&h<br />
filtcilng ti>r rrparanon. Cuns~dcr TT to he the lirsc arriv~l trt\cltxm~. br du\\n-poinp<br />
um\ala. Ah shown I" Figure 3.1.3 (right). u time irilmc I-TT) brmrrl hy adwnclnp FRT h)<br />
litst arrival time. by submttmg tlmc 17. would flatten rhr. doan-gums ailye uhilc<br />
incrcanng wavcnumhen of up-~olng nenu. possshly caustng rl~nsmg. Slmllarly. u tlmc<br />
immr delayed hy tipst arrival rime (+TT) would flatten up-going events tbr zero source-a-<br />
73
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