Algorithm for the separation of harmonic sounds with time-frequency smoothness constraint

Tuomas Virtanen
DAFx-2003 - London
A signal model is described which forces temporal and spectral smoothness of harmonic sounds. Smoothness refers to harmonic partials, the amplitudes of which are slowly-varying as a function of time and frequency. An algorithm is proposed for the estimation of the model parameters. The algorithm is utilized in a sound separation system, the robustness of which is increased by the smoothness constraints.