A command to query the selected Spectrum object.
The standard deviation of a spectrum is the square root of the second central moment of this spectrum. See Spectrum: Get central moment....
The standard deviation is a measure for how much the frequencies in a spectrum can deviate from the centre of gravity. For a sine wave, the standard deviation is zero. For a white noise, the standard deviation is the Nyquist frequency divided by √12.
© ppgb, March 23, 2002