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Spectrum of a sound


Can you explain to me this problem

thanks


ClearAll["Global`*"]

la3[t_]:=Sin[2 ¦Ð 440 t]

suite=Table[la3[t],{t,0,1/2,.0001}];

ListPlot[suite,PlotJoined\[Rule] True];
nPoints=Length[suite]

amplitude=Abs[Fourier[suite]];

ListPlot[amplitude,PlotJoined\[Rule]
    True,PlotRange\[Rule] All,AxesLabel\[Rule] {Hz,dB}];

ListPlot[amplitude,PlotJoined\[Rule] True,AxesLabel\[Rule] {Hz,dB}];

Can you explain me this spectrum
How to do, to have only a Dirac Fuction ¨¤ 440 Hz?




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