394149/D
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expressedindecibels.Aratiohigherthan1:1(greaterthan0dB)indicatesmore
signalthannoise.WhileSNRiscommonlyquotedforelectricalsignals,itcan
beappliedtoanyformofsignal[...].
Wikipedia,CopiedSeptember2013
Thesignalistheechothatwewanttoknowsomethingabout,whilethenoiseisany
unwantedsignalsordisturbances.Theechomustbedetectedinthenoiseandtherefore
itisnecessarytokeepthenoiselevelaslowaspossibleinordertoobtainhigh
interpretation.
Thenoisethatcontributestothesignaltonoiseratiomaybedividedintothefollowing
typesofnoise:
•Selfnoise
•Ambientnoise
•Electricalnoise
•Reverberation
•Fishinggearnoise
AThetransducercanpickupnoisefrom
•Biologicaldisturbances
•Interference
•Cavitation
•Propellernoise
•Flownoise
•Acousticnoisefromotherhydroacousticsystems
BThetransducercableislong,andmaypickupelectricnoisefromgenerators,
pumps,coolingsystemsandotherelectricorelectromechanicaldevices.
CThepreampliersareverysensitive,andtheycaneasilypickupelectricalnoise
frominternalandexternalpowersupplies.Thepreampliersarealsovulnerableto
analoguenoisecreatedbytheirownelectroniccircuitry.Digitalnoisecreatedby
theconverterandprocessingcircuitrycanalsocreateproblems.
DConverterstransformtheanalogueechoestodigitalformat.
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