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Telos Zephyr Xstream Two-Way Radio User Manual

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USER’S MANUAL

Section 10: APPLICATIONS GUIDE 186

Remember,ifanyoftheannounceraudiofromtheremotesiteisreturnedviathemonitorfeed,

itwillbedelayedbythecodeclink,causinganechoeffect.Problem.Theansweristomake

sureyouhavethebestpossiblehybridwiththemaximumtrans‐hybridloss,suchasasystem

thatusesISD

Nlines.Ifithas

variableoverride(callerducking),youcouldincreasetheamount

whentheseremotesareinprogress(or,onsomehybrids,youwoulddecreasethesettingofthe

"duplex"control).

Someusersplaceadownwardexpander,carefullyadjustedtogatetheleakage,inthecaller

audiopath.

Main Pro

g

ra

m

Output









Telephone

Mix-Minus

Remote

Mix-Minus

Studio Console

Other Sources

for music, etc.

Zephyr

Trans-

mission

Path

Phone

Hybrid

REMOTE SITE STUDIO

Diagramshowingsystemset‐upforremoteswithdelayinthetransmission

pathandphonestakenatthestudio.Notethatthisisthesameasrequired

forsatellitelinks.



Anotherissueworthconsideringistheroundtripdelay.Theapparenton‐airresponsetimeof

thetalenttocallers’commentswillbethesumofstudio‐to‐remo

tedelay+remote‐to‐studio

delay+talent’sthinkingtime.Forthisreasonthestudio‐to‐remotepathwillgenerallyusethe

G.722mode,whichsacrificesfidelityfordelay(afterall,thecallersneednotbeinhighfidelity).

Thisroundtripdelayissuewillalsoaffectyourchoic

eofremote‐to‐studiocoding.Iftheshow

willbe90%talkwithjustasmallamountofmusicthendelaycanbeminimizedbyusingamono

modeforthispathratherthanusingoneoftheslowerstereomodes.

HereiswhereZephyrXstr

eam’sAAC‐LDencodingreallyshines.Itgivesyouhighquality

announceraudiowiththelowestdelaypossible.Inaddition,thereduceddelaytimewillserve

makeanyleakagelessdistracting(formoreonthisseeSection6‐AudioCodingReference).

AnothertrickistouseaPOTScall(callmo

de=Phone)forthestudio‐to‐remotelink,whichwill

makethedelayinthatdirectionverysmall.Otherintermediatetradeoffsarepossible,andwill

bedependentonyourformat.Talentthinkingtimecanbesignificantlyreducedbydrinkinga

strongcupofcoffee!

Forinformationonthetradeoffbetwee

naudioqualityanddelay,refertomanualSection6

(AudioCodingReference)

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