Detailed Description of Sonic Visualiser 1.9

Sonic Visualiser is an application for viewing and analysing the contents of music audio files.5th May 2011: Sonic Visualiser 1.9 has been released.

The aim of Sonic Visualiser is to be the first program you reach for when want to study a musical recording rather than simply listen to it.

We hope Sonic Visualiser will be of particular interest to musicologists, archivists, signal-processing researchers and anyone else looking for a friendly way to take a look at what lies inside the audio file.

Sonic Visualiser is Free Software, distributed under the GNU General Public License (v2 or later) and available for Linux, OS/X, and Windows. Sonic Visualiser was developed at the Centre for Digital Music at Queen Mary, University of London.

Sonic Visualiser 1.9 showing a waveform pane and a melodic range spectrogram pane.

Overlaid on the spectrogram is a note layer, showing the output of a note-tracker Vamp plugin that is being evaluated. The notes from the tracker are played using a piano sample, configured in the plugin dialog visible.

Sonic Visualiser 1.9 showing about a minute of the final movement of Mahler's 9th symphony, performed by the Czech Philharmonic under Vaclav Neumann. (In fact the whole final movement is loaded and may be scrolled through - see the green overview at the bottom of the window.)

The waveform pane at the top is overlaid with a spectral centroid calculation (the coloured shading), the outputs of two note onset detection Vamp plugins (red and black vertical lines - neither of them seems to work very well on this sort of music) and the onset likelihood function from a third onset detection plugin (the blue curve). The spectrogram pane below it shows estimated instantaneous frequencies for peak FFT bins.

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