科技通信课程教案-ordingly,-to-noiseratio(SNR),heSNRatthereceiverinputastheratiooftheaveragesignalpowertotheaveragenoisepower,(dBs),definedas10timesthelogarithm(tobase10),signal-to-noiseratiosof10,100and1,000correspondto10,20,and30dBs,:speech,music,pictures,-valuedfunctionoftimethatplaystheroleoftheindependentvariable;ateveryinstantoftime,-dimensional,asinthecaseofspeech,music,puterdata;two-dimensional,asinthecaseofpictures;three-dimensional,asinthecaseofvideodata;andfour-dimensional,,weelaborateondifferentsourcesofinformation.(1),municationprocessinvolvesthetransferofinformationfromaspeakertoalistener,essivestages:(1)'smindisrepresentedbyaspeechsignalthatconsistsofsounds(.,pressurewaves)generatedinsidethevocaltractandwhosearrangementisgovernedbytherulesoflangu
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