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381291/C

ReducingnoiseandfalseechoeswiththePing-PingFilter

ThePing-PingFilteranalysesthehistoricalinformationfrompreviousconsecutivepings

inordertoremoveunwantednoiseandfalseechoesfromtheSU90presentation.

Context

Thefollowinglteroptionsareprovided.

•Off:SelectOfftodisablethelter.Thehistoricalinformationfromprevious

transmissions("pings")arenotusedtoremovenoiseandunwantedechoes.

•Weak:SelectWeaktoallowtheltertocomparetheechoesfromthelatesttwopings.

Forthecurrentechotobeshown,itmustbepresentinbothofthesepings.

•Medium:ChooseMediumtocomparetheechoesfromthelatestfourpings.Forthe

currentechotobeshown,itmustbepresentinallofthesepings.

•Strong:SelectStrongtoallowtheltertocomparetheechoesfromthelatesteight

pings.Forthecurrentechotobeshown,itmustbepresentinalloftheseeightpings.

TheltersintheSU90areimplementedin“series”.ThePing-PingFilteristhelastlter

inthesequence,soanychangestotheotherltersmayhaveaneffectonhowitworks.

Procedure

1Clickinanyviewtomakeitactive.

Theactiveviewisidentiedwithathickerborder.

2OpentheActivemenu.

3SelectPing-PingFilter.

4Choosetherequiredsetting.

Thechoiceyoumakeisbydefaultonlyappliedtothecurrentlyselected(active)

view.

Relatedtopics

Improvingtherecognitionofshandschoolsusingreceiverlters,page72

Operatingprocedures

Simrad SU90 User Manual

Other manuals for Simrad SU90