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457420/A

NotethatGain,TVG(TimeV ariedGain)andDisplayGainarenotlters,butincluded

onlytoillustratethecomplete"signalpath".

Relatedtopics

Improvingtherecognitionofshandschoolsusingreceiverlters,page78

ReducingnoiseandreverberationwiththeAGC(AutomaticGainControl)function,page79

ReducingpropellernoiseandinterferencewiththeNoiseFilter,page81

ReducingbottomandsurfacereverberationwiththeRCG(ReverberationControlledGain)

function,page82

ReducingnoiseandfalseechoeswiththePing-PingFilter,page84

Adjustingtheintensityoftheechopresentations,page86

ReducingnoiseandreverberationwiththeAGC(Automatic

GainControl)function

Identifyingechoesfromshandschoolscanoftenbechallengingwhentheyarehidden

bynoiseandreverberation.Whensonarconditionsarepoor,effectivetuningofthelters

intheST90maybenecessarytoachieveasatisfactoryresult.AutomaticGainControl

(AGC)isoneofthetoolsprovidedbytheST90toremovenoiseandreverberationfromthe

echopresentation.

Context

TheAGC(AutomaticGainControl)functionrunsanautomaticanalysisoftheechostrength.

BasedonthisanalysistheST90maintainsaproperdynamicrangebasedonallthecurrent

echovalues.Thisisdonebyautomaticallyreducingthegainifyouhavereverberationand

noise,orincreasingthegainiftheacousticalconditionspermitit.

Operatingprocedures

Simrad ST90 User Manual

Other manuals for Simrad ST90