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Запустите в матлабе и посмотрите сами:
x = zeros(1,128)
x(127)=20
rs = fft(x)
tr = [ones(1,59),zeros(1,11),ones(1,58)]
rs = rs.*tr
p = ifft(rs)
semilogy(abs(p))
pause
x = zeros(1,128)
x(64)=20
rs = fft(x)
tr = [ones(1,59),zeros(1,11),ones(1,58)]
rs = rs.*tr
p = ifft(rs)
semilogy(abs(p))
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