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x = zeros(1,128)
x(127)=20
rs = fft(x)
tr = [ones(1,49),zeros(1,31),ones(1,48)]
rs = rs.*tr
p = ifft(rs)
semilogy(abs(real(p)))
pause
x = zeros(1,128)
x(64)=20
rs = fft(x)
tr = [ones(1,49),zeros(1,31),ones(1,48)]
rs = rs.*tr
p = ifft(rs)
semilogy(abs(real(p)))
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