SuperLectures.com

AN ACOUSTICALLY-MOTIVATED SPATIAL PRIOR FOR UNDER-DETERMINED REVERBERANT SOURCE SEPARATION

Acoustic Source Separation

Full Paper at IEEE Xplore

Přednášející: Ngoc Duong, Autoři: Ngoc Q. K. Duong, Emmanuel Vincent, Rémi Gribonval, INRIA / Centre de Rennes - Bretagne Atlantique, France

We consider the task of under-determined reverberant audio source separation. We model the contribution of each source to all mixture channels in the time-frequency domain as a zero-mean Gaussian random vector with full-rank spatial covariance matrix. We introduce an inverse Wishart prior over the covariance matrices, whose mean is given by the theory of statistical room acoustics and whose variance is learned from training data. We then derive an Expectation-Maximization (EM) algorithm to estimate the model parameters in the Maximum A Posteriori (MAP) sense given prior knowledge about the microphone spacing and the source positions. This algorithm provides a principled solution to the well-known permutation problem and achieves better separation performance than other algorithms exploiting the same prior knowledge.


  Komentáře

Please sign in to post your comment!

  Informace o přednášce

Nahráno: 2011-05-24 10:55 - 11:15, Club H
Přidáno: 9. 6. 2011 00:04
Počet zhlédnutí: 194
Rozlišení videa: 1024x576 px, 512x288 px
Délka videa: 0:17:33