Specifications

Operationalprocedures
2Alternativemethod:Horizontalgain
aClicktheHorizontaltabtoopenthemenu.
bOntheHorizontalmenu,clickGain.
Thisparameterisusedtocontrolthereceivergain,thatishowmuch
amplicationthatisusedonthereceivedechoes.
cClickeithersideofthebuttontoleafthroughtheoptions,orthemiddleofthe
buttontoopentheparameterdialog.
3Alternativemethod:Verticalgain
aClicktheVerticaltabtoopenthemenu.
bOntheV erticalmenu,clickGain.
Thisparameterisusedtocontrolthereceivergain,thatishowmuch
amplicationthatisusedonthereceivedechoes.
cClickeithersideofthebuttontoleafthroughtheoptions,orthemiddleofthe
buttontoopentheparameterdialog.
AdjustingtheAutomaticGainControl(AGC)
Purpose
TheAGC(AutomaticGainControl)functionadjuststhegainusinganimageprocessing
algorithm.Thisprocessingdependsonthestrengthoftheincomingechosignal.
Theimageisanalyzed,andreverberationandechoesareidentied.Basedonthe
analysis,weakechoesareamplied,whilestrongechoesarereduced.Theresultisa
“normalizing”effectthatreducesnoiseandreverberation.TheAGCisfunctionalupto
thesonar’smaximumrange.Asshowinthemenu,theAGChasfourdifferentsettings.
Thesesettingsdenethedifferencebetweenthemaximumandminimumecholevelfor
theltertotakeeffect.
Note
Whenthisparameterischangedonahorizontalmenu,thechosensettingisonlyput
touseonthehorizontalsonarpresentation.Ifyouchangetheparameteronavertical
menu,itisonlyappliedtotheverticalsonarslicepresentation.
372739/D
61