Editing Cepstrum (section)

==Origin==
The concept of the cepstrum was introduced in 1963 by B. P. Bogert, M. J. Healy, and [[J. W. Tukey]].<ref name="Bogert_19632"/> It serves as a tool to investigate periodic structures in frequency spectra.<ref name="Norton_2003">{{cite book| author = Norton, Michael Peter |author2=Karczub, Denis| title = Fundamentals of Noise and Vibration Analysis for Engineers| url = https://books.google.com/books?id=jDeRCSqtev4C| date = November 17, 2003| publisher = Cambridge University Press| isbn = 0-521-49913-5 }}</ref> Such effects are related to noticeable echos or [[Reflection (physics)|reflections]] in the signal, or to the occurrence of harmonic frequencies ([[Harmonic series (music)#Partial|partials]], [[overtones]]). Mathematically it deals with the problem of [[deconvolution]] of signals in the frequency space.<ref name="Childers_1977">D. G. Childers, D. P. Skinner, R. C. Kemerait, "[https://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1455016 The Cepstrum: A Guide to Processing]", ''Proceedings of the IEEE'', Vol. 65, No. 10, October 1977, pp.&nbsp;1428–1443.</ref>

References to the Bogert paper, in a bibliography, are often edited incorrectly.{{citation needed|date=October 2020}} The terms "quefrency", "alanysis", "cepstrum" and "saphe" were invented by the authors by rearranging the letters in frequency, analysis, spectrum, and phase. The invented terms are defined in analogy to the older terms.