hanning Return the filter coefficients of a Hanning window of length M hanning (M) hanning (M, "periodic") hanning (M, "symmetric") M: real scalar, which will be the length of hanning window Return the filter coefficients of a Hanning window of length M. If the optional argument "periodic" is given, the periodic form of the window is returned. This is equivalent to the window of length M+1 with the last coefficient removed. The optional argument "symmetric" is equivalent to not specifying a second argument.