I want to cancel the negative sign out of IFFT

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abdullah qasim
abdullah qasim 2019-1-4
评论： abdullah qasim 2019-1-5
I want to cancel the negative signal out of IFFT and allow the positive signal to pass and add DC-bias in the output signal 111.jpg

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madhan ravi
madhan ravi 2019-1-4
help abs

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Walter Roberson
Walter Roberson 2019-1-4
max(0, xt)
However you appear to want to work at the Fourier level and to transform the coefficients so that ifft of the coefficients will have the required form.
To do that you should convolve with the Fourier transform of the Heaviside function, which you would do by finding the coefficients associated with the transform of the heaviside function , and then multiply those by the input fft transformed signal .
The Fourier transform of the heaviside function is a bit tricky. See below and read through to the Tragedy link.
https://math.stackexchange.com/questions/73922/fourier-transform-of-unit-step

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