The problern of underdetermined blind source sepamtion
is addressed. An adnanced classification method
based upon competitive leainin,g is proposed for automatically
determining the number of active sources
over the obseruatior~. Its ihtroduction in underdetermined
blind source separation successfully overcomes
th,e drawbock of an existing method, in which the goal
of sepamtiny more sources than the number of available
mixtures is achiezled by exploiting the sparsity of
the non-stationaq sources in the time-frequency domain.
Sim,ulation studies are presented to support the
proposed approach.