Quarterly Progress Report Number 2, 1 November 1966 - 31 January 1967.

The Cepstrum Alanysis effort on this contract has been diverted during the last quarter into several related areas. This work is preliminary to the Cepstrum Alanysis of some sonar echoes. Specifically and briefly, a Cepstrum Alanysis involves a spectrum analysis, a digital filter and a second spectrum analysis. A spectrum analysis can be performed by computing the Fourier transform of a covariance or by the use of a comb filter. It was decided that these technique should be implemented since these methods are not, in practice, equivalent.