http://www.cse.unsw.edu.au/~flatmax/maskogram These images are taken from 'wav' files ... two things : a] Frequency on the vertical b] Time on the horizontal Does anyone know of the coining of the term 'maskOgram' previously ? BAsically removes redindancy from a spectrogram in a particular fashion.... The code runs on most open systems ... requires GTK+ and ANSI C++ ... Matt