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FFT and IFFT

Started by mb_for2003 August 23, 2003
I have signal x = sin(2*pi*2*t) + sin (2*pi*5*t) + noise(0.1).
Could any one tell me how to obtain signal y = x - noise(0.1) in time
domain? I do not know how to use IFFT.
Much appreciate for your help!
Mb.