Noun
quefrency (plural quefrencies)
(signal processing) The inverse of the distance between successive lines in a Fourier transform, measured in seconds.
Note that a pure sine wave should not be used to test the cepstrum for its pitch determination from quefrency as a pure sine wave does not contain any harmonics. Source: Internet
It can be implemented by multiplying by a window in the quefrency domain and then converting back to the frequency domain, resulting in a smoother signal. Source: Internet