I want to cancel the negative sign out of IFFT

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

Answer 1

[madhan ravi]

help abs

[abdullah qasim]

thank u

do you have another way

[madhan ravi]

Anytime :) , can't think of any other way.

[abdullah qasim]

thank u

Answer 2

[Walter Roberson]

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