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Audio Data

Audio data present a great advantage: as it is a very rich "format", we can have all the informations we need to evaluate music. It is by the way very general, i.e. everykind of music source could be used as input signal through an audio acquisition: piano, flute, guitar, but also voice or percussions.

The number of useful parameters can be very high, and considerabely improve results: Harmonic spectrum, enveloppe spectrum, energy, zero-crossing...
Since most of these parameters are instrument-depending, We can significantly increase system acuracy by building a different model for each kind of instrument.

On the other hand, audio data require space and time: real-time calculations on audio data means an optimal use of computer's ressources.
Another problem would be the possible lack of precision: for example, detecting the start time of a note can not be done without an error rate. This could be mainly due to signal perturbations (noise, low level signal...), especialy on weak attacked notes.



Mathieu Gilles (Betr. soltau) 2003-08-25