Gnu Radio Fft Phase Calculation. The flowgraph below may be a good starting point. Controlled by a gui range with steps of 1 2khz.
Sample input signals at least 1 period and then scan forward for zero crossing from negative to positive value for each sin wave. The skip head and keep m in n blocks used together to extract only the fft bin in interest. This block takes in a vector of floats or complex values and calculates the fft.
Keywords gpu fft gnu radio raspberry pi s.
If all you do is want to see the frequency domain of a signal the qt gui frequency sink is more user friendly. To derive the fft we assume that the signal s duration is a power of two. An additional feature of gnu radio is the companion feature. Note that even if the input signal is real the output will be complex so you must use a complex to mag or similar block if you want to see magnitude.
