  Nowadays, studying introns is becoming a very promising field in the
genomics. Even though they play a role in the dynamic regulation of gene and in
the organism's evolution, introns have not attracted enough attention like
exons did; especially of digital signal processing researchers. Thus, we focus
on analysis of the C.elegans introns. In this paper, we propose the complex
Morlet wavelet analysis to investigate introns' characterization in the
C.elegans genes. However, catching the change in frequency response with
respect to time of the gene sequences is hindered by their presence in the form
of strings of characters. This can only be counteracted by assigning numerical
values to each of the DNA characters. This operation defines the so called "DNA
coding approach". In this context, we propose a new coding technique based on
the Frequency Chaos Game Representation (FCGR) that we name the "Frequency
Chaos Game Signal" (FCGS). Results of the complex Morlet wavelet Analysis
applied to the Celegans FCGS are showing a very distinguished texture. The
visual interpretation of the colour scalograms is proved to be an efficient
tool for revealing significant information about intronic sequences.
