Hi everybody! if anybody can answer to that (would be really helpful..): how to time shift (ts) a real signal (N samples, T time period, dt sample rate) using matlab: timeshift signal = ifft (fft(signal)*exp(2i.pi.f.ts)) ??? and then what is 'f' in the equation? is it the vector: f = [0:(length(fft(signal))-1)*df] with df = 1/(N*T)??? thanks M.