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(i) Determine the DFT of the sequence x(n) (ii) Also Find the DFT of the following sequences, using the result obtained in (i)

i)

x(n)=1,0<n<3

x(n)=0,4<n<7

ii)

x1(n)=1,n=0

x1(n)=0,1<n<4

x1(n)=1,5<n<7

x2(n)=0,0<n<1

x2(n)=1,2<n<5

x2(n)=1,6<n<7

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x(n)={1,1,1,1,0,0,0,0}

DFT by DIF-FFT

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Output of stage-1

S1(0)=x(0)+x(4)=1+0=1

S1(1)=x(1)+x(5)=1+0=1

S1(2)=x(2)+x(6)=1+0=1

S1(3)=x(3)+x(7)=1+0=1

S1(4)=[x(0)x(4)]W08=(10)(1)=1

S1(5)=[x(1)x(5)]W18=(10)(0.707j0.707)

S1(6)=[x(2)x(6)]W28=(10)(j)=j

S1(7)=[x(3)x(7)W38=(10)(0.707j0.707)

Output of stage-2

S2(0)=S1(0)+S1(2)=1+1=2

S2(1)=S1(1)+S1(3)=1+1=2

S2(2)=S1(0)+S1(2)]W08=(11)W08=0

S2(3)=S1(1)+S1(3)]W28=(11)W28=0=0

$S_2 (4)=S_1 (4)+S_1 …

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