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TRANSFORMASI FOURIER DISKRIT

DasarPembentukan DFT

  • Bangkitkansinyal sinus x(t) = 3cos(2πt), pada t = nT.Untuksuatu n = 0~ 99, dan T=0,01.

    • %dft1
    %oleh :Syarial
    n=0:199;
    T=0.01;
    x_t=3cos(2pinT);
    plot(n,x_t)
    grid;

    Output Program

  • Untukmemulailangkah program DFT, kitamulaidenganmembuat program baru, yangmengacupadabentukpersamaanberikutini.

    • %File Name: dft_2.m
    %oleh :Syahrial
    clearall;
    N=200;
    nn=N-1;
    for k=1:200;
    x_n=0.0;
    for n=1:nn
    x_n = (3cos(0.02pin)).(exp(-jk2pin/200)) + x_n;
    end
    yR(k)=real(x_n);
    yI(k)=imag(x_n);
    magni_k(k)=sqrt(real(x_n).real(x_n) +imag(x_n).imag(x_n));
    end
    figure(1)
    stem(yR)
    axis([0 200 0 800])
    xlabel('indekfekuensi')
    title('Bagian Real')
    grid;
    figure(2)
    stem(yI)
    axis([0 200 0 800])
    xlabel('indekfrekuensi')
    title('BagianImajiner')
    grid;

    Output Program

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