Transcription of A Very Basic Introduction To Time/Frequency …
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A Very Basic Introduction To Time/Frequency …
AVeryBasicIntroductionToTime/FrequencyDo mainsParticleMarch 10,2004 AbstractA very briefintroductionto waves, terminology, time /frequencydomains,witha bit of mentionof IntroductionInthecontextof communications,a signalis basicallysomeinformationsomehow encodedas a wave. Everythingtravelsas a wave, so let'slookatsomeof thesimpleideasof presents a thevolume,or air-pressure,or strength,or energy,etc.,dependingonwhatthiswave example,if thisis anoceanwave,thentheverticalaxismay be thewave height. If thisis a soundwave in theair,thenit is it is thesoundwave in a wire,thenit' (heredepictedin termsof ) oftenrepresents thetimeordistance(orspace) thatthewave generallyhave a period, which canbe viewed as thetime/distanceof whenthewave repeatsitself| Figure1 theperiod is 2 .A closelyrelatedproperty of theperiod is thefrequency. Frequencyisthespeedat which thewave cyclesitsperiods,andis always expressedinproper speedunits,as in `cyclesper second'(commonlyknownas Hz),and`kilo-cyclesper second'(commonlyknownas kHz) `kilo'standsfor 1000,so if somethingis 8kHz,thenit's 1 =2 3 =22 5 =23 time /DistancePeriodAmplitudeFigure1: 1 : 4 HzSinWave; sin(2 4t)Figure2 illustratesaSinwave at , andis expressedinseconds.
A Very Basic Introduction To Time/Frequency Domains Particle March 10, 2004 Abstract A very brief introduction to waves, terminology, time/frequency
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