Average spectrum representation - SonicVisualiser I try to have a signal (speech) represented in time and frequency domain  (waveform, spectrum and spectrogram). I use Sonic Visualiser and for spectrum representation it shows an analysis at a given point in time.
I wonder what representation should I use to represent a selected area of the waveform e.g. a word, in frequency domain (spectrums). Sonic Visualiser doesn't give averaging options.

Vasiliki
It would not be useful to average in time because vocalisations are represented directly by their spectrogram. (For example: http://www.u.arizona.edu/~ohalad/Phonetics/notes/Formants%20Spectrograms%20and%20Vowels.PDF or even http://www2.coloradocollege.edu/dept/ev/Research/Faculty/OVALItems/FordOsborneVocabulary/_SouthernVocabularyTable.html)

I would suggest that you export your spectrogram as an image and then isolate and layout the areas you are interested in, in some other software like GIMP. For more information, please see: http://www.sonicvisualiser.org/doc/reference/1.9/en/#imageexport and http://www.gimp.org/

Hope this helps.