  A number of signal processing and statistical methods can be used in
analyzing either pieces of text or DNA sequences. These techniques can be used
in a number of ways, such as determining authorship of documents, finding genes
in DNA, and determining phylogenetic and linguistic trees. Signal processing
methods such as spectrograms provide useful new tools in the area of genomic
information science. In particular, fractal analysis of DNA ``signals'' has
provided a new way of classifying organisms.
