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Figure 14. The Transpose parameter. The system learns the input melody
plus the transpositions.
It is interesting to use the transposition mode with children, because it creates quickly a rich
model. The bad effects due to the shifts in keys are usually not noticeable, unless the input
played are very tonal.
Playing without the transposition allows you to obtain more “precise” outputs. However,
please bear in mind that it may take a few input melodies before the system is able to produce
an output.
5.4 Keep only the last N different melodies
This parameter sets the length of the memory taken into account for the output.
If this parameter is set to 10 and you have played more than 10 phrases, only the last 10
different phrases will be taken as the training set for the output. In other words, the parameter
creates a sliding temporal window: the system forgets what happened before the 10 last
phrases. 10 different phrases means that their transpositions (if the transposition mode was
on) are not counted (i.e. there will be 10 * 13 = 130 melodies in the memory).
If this checkbox is unchecked, all input phrases are taken into account as the training set for
the output.
Please note that at all times the status of the memory is updated in the Memory Panel
(number of phrases played, and total number of notes).
5.5 Memory management
5.5.1 Memory Panel
Clicking on Memory Tab opens Memory Panel illustrated Figure 15, with several buttons in
order to clear memory, edit memory, save memory and load memory from previously saved
training sets. These files contain all the information on pitch, duration and amplitude of the
notes / chords played. They are text files so you can read them, if needed with a text editor.
Please do not edit them though, since they are parsed automatically by the system.
Sony Computer Science Laboratory Paris
Technical Report 2013-3
19