FFTANALYTIC Compute analytic representation Usage: z = fftanalytic(f); z = fftanalytic(f,L); z = fftanalytic(f,L,dim); Input parameters: f : Input data. L : Extend or truncate f to this length. dim : Dimension to along which to apply the computations. Output parameters: z : Analytic signal. FFTANALYTIC(f) computes the analytic representation of a real-valued signal f. The analytic representation is computed through the FFT of f. The computations are done along the first non-singleton dimension. FFTANALYTIC(f,L) acts as before but f is padded with zeros or truncated to length L. FFTANALYTIC(f,L,dim) in addition allows specifying the dimension along which the computation should be done. The real part of the analytic representation z equals the signal f and the imaginary part is the Hilbert transform of f. The instananeous amplitude (a Hilbert envelope) of the signal f can be computed as: abs(fftanalytic(f)); The instantaneous phase of the function f can be computed as: angle(fftanalytic(f));
Package: ltfat