sentences:  This is the property of separability in the time domain, and is equivalent to requiring that the time between two events be
  greater than the length of the impulse response of the short-time Fourier transform filters, the span of non-zero samples in formula_54
  
  In general, there is an infinite number of equally valid decompositions for a multi-component signal.The separability property must be considered in the context of the desired decomposition.For example, in the analysis of a speech signal, an analysis window that is long relative to the time between glottal pulses is sufficient to separate harmonics, but the individual glottal pulses will be smeared, because many pulses are covered by each window (that is, the individual pulses are not separable, in time, by the chosen analysis window).