The (*) complex form of this object is sometimes preferred to the power form as no phase information is lost.  
Homomorphic convolution is an alternative to analysis of this object, which was first introduced by Bogert et al to analyze one-dimensional seismic signals.  It is preferable to a similar object as it can separate source and transmission effects.  The (*) complex form of this object is sometimes preferred to the power form as no phase information is lost.  It is sometimes used in detecting defects in complex gear box systems, and in combination with the mel scale, it is the most popular method of automatic speech recognition.  It is often depicted as a plot of amplitude versus an analog of time known as quefrency ("CUE-fren-see").  For 10 points, name this inverse Fourier transform of the logarithm of a frequency spectrum, which got its name for being an anagram of "spectrum."
Homomorphic convolution is an alternative to analysis of this object, which was first introduced by Bogert et al to analyze one-dimensional seismic signals.  
{cepstrum} [pronounced “KEP-strum”; accept word-form variants like {cepstral} analysis] (6) [DW]