http://worldcat.org/entity/work/id/137131372

Quarterly Progress Report Number 4, 1 May - 31 July 1967

It was pointed out in the previous progress report that the techniques for computing a Cepstrum have certain shortcomings in a mathematical sense. These restrictions were placed on the technique by certain approximations and assumptions that were made concerning the relative amplitudes of the original signal and echoes. This past quarter, effort was made to derive alternate techniques for computing Cepstrum, using as few mathematical assumptions as possible. (Author).

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