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Cepstrum
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<p> In <a href="/facts/Fourier_analysis/sUA8JP6q">Fourier analysis</a>, the cepstrum is the result of computing the <a href="/facts/Inverse_Fourier_transform/aM1aMkf0">inverse Fourier transform</a> (IFT) of the <a href="/facts/Logarithm/QeXaV97q">logarithm</a> of the estimated <a href="/facts/Signal_spectrum/q3Rfs7b0">signal spectrum</a>. The method is a tool for investigating periodic structures in <a href="/facts/Frequency/QUSbPaW8">frequency</a> spectra. The <i>power cepstrum</i> has applications in the analysis of <a href="/facts/Human_speech/WEelhfTs">human speech</a>. </p><p>The term <i>cepstrum</i> was derived by reversing the first four letters of <i>spectrum</i>. Operations on cepstra are labelled <i>quefrency analysis</i> (or <i>quefrency alanysis</i>), <i>liftering</i>, or <i>cepstral analysis</i>. It may be pronounced in the two ways given, the second having the advantage of avoiding confusion with <i>kepstrum</i>. </p>