The Cepstrum

Carl Lumma expressed some interest in "cepstrum" transforms in a discussion we recently had here on the ATL. Here are some links (for the curious) which provide some information about the "cepstrum" and it's applications (essentially, extracting "virtual pitch" information by attempting to clearly identify the lowest frequency "implied fundamental" of complicated composite waveforms):

http://www.libinst.com/cepst.htm

http://cslr.colorado.edu/beginweb/eurospeech2001/Euro01-RootCep-A4-Wcover.pdf

http://www.nauticom.net/www/jdtaft/cepstrum.htm

Enjoy, J Gill