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I want to cancel the negative sign out of IFFT

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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 on 4 Jan 2019
help abs

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Walter Roberson
Walter Roberson on 4 Jan 2019
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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