I am trying to implement in C or C++ a solution for a fft and Ifft when the signal values are not obtained at a constant rate, making it having a desviation between the values and the periodic ones. I do not know how I can change the algorithm of calculating the fft with synchronized signals as in https://wikimedia.org/api/rest_v1/media/math/render/svg/02a7699d274d226871209491c8a05976d6e46cf3 into a uneven spacing values of signal.One of my ideas is using the values to make the completed signal and then catchiing the correct points, but it is a very time consuming solution, and i think that as we have a deviationThe overall objective is to have the fft as described and the ifft values in that points
fft with non uneven spacing between the value of the signal
fourier analysis;fourier transform