#91 A Source-Filter Model for Quasi-Harmonic Instruments

In this paper we propose a new method for a model representing the time-varying spectral characteristics of quasi-harmonic instruments. This approach comprises a linear source-filter model, a parameter estimation method and a model evaluation based on the model's variance. The source-filter model is composed of an excitation source generating sinusoidal parameter trajectories and a modeling resonance filter, whereas basic-splines (B-Splines) are used to model continuous trajectories. To estimate the model parameters we apply a gradient descent method to a training database and to evaluate our model we measure the model's variance on a test database. Such a model could later be used as a priori knowledge for polyphonic instrument recognition, polyphonic transcription and source separation algorithms as well as for resynthesis.