When you press the Setup button on newly activated Cepstrum line, the following setup screen window will open:
Module performs real cepstrum analysis (one-sided). The cepstrum is a representation used in homomorphic signal processing, to convert signals (such as a source and filter) combined by convolution into sums of their cepstra, for linear separation.
Segment length (number of samples used)
Window (Rectangular, Hanning, Hamming, Flat top, Triangle and Blackman)
Overlap defines the percentage of time signal that has already been calculated and it is used again for calculation.