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1、底噪问题研究Insomeunbalancedoutputdevicesandconnection,nowmostlyinordertosavecost,moreconvenient,directusesinglecoreshieldedcable,willbalancetheportsandpointsbalanceconnected,butnotadoptbalance一notbalancechanges,thiskindofconnectionshieldalsoinaudiocircuit,shieldinductionnoise
2、ismixedwiththeaudiosignal,therebyincreasingthenoise,thiswillbetheintroductionofnoiseismainlyaway,istherightthing,bothequilibriumandnon-equilibriumtransport,usethedoublecoreshieldedcable,thentheshieldonlyoneendoftheoutputorinputgroundinginbalanee.Amplificationatthesceneof
3、therecording,soundsystem,suchasnoiseproblemisacommonandveryheadache,usuallycomposedofasoundsystem,themoreorthelongerthetransmissiondistance,thegreaterthebackgroundnoiseinthesystem,andmakesasoundsystemtonormalrecordingorpawork,themechanismofformationofthesoundsystemnoisei
4、smorecomplex,nowthesoundsystemandsolutionstomakeaanalysisofthemaincausesofnoise・noiseThecauseofnoiseStrayelectromagneticradiationinterferenceenvironment,suchasmobilephones,walkie-talkiesandothercommunicationsequipmentofhighfrequencyelectromagneticradiationinterferenee,th
5、eenvironmentoftheelevator,airconditioning,autoignition,welding,suchaselectricpulseradiation,studiolightingcontrol,siliconcontrolledrectifiercontrolequipmentproducedbytheradiation,byaudiotransmissionlinesformedinthetransmitsignaldirectlymixedwithnoise,orthroughtheshellofp
6、rotectiveshielddevicecircuitinterferencenoisejammer,practiceshowsthatinsomespecialoccasions,suchastheextensiveuseofthyristordimmerequipmentofthestudio,etc・，ifthereisnoreliableshieldingandgroundingmeasures,thenoisewillbeveryserious・2powersourceinterferencenoiseAudioequipm
7、entoftheexternalinterference,inadditiontotheelectromagneticradiationmode,thepowerpartintroduceinterferencenoisewillbeanotheroneofthemaincausesofnoise,urbanpowergridduetoavarietyoflightingequipment,powerequipment,commonaccesscontrolequipment,formedaveryseriousinterference
8、sources・Likeapickupinthesamegridoflightingcontrolequipment,airconditioning,motorandsoonequipmentcanprod
