yosuke izumi Department of Information Physics and Computing, Graduate School of Information Science and Technology, the University of Tokyo izumi@hil.t.u-tokyo.ac.jp average computational time is about 20 seconds per test excerpt by our algorithm running on a computer with 3GHz of CPU, needed prior informations are the number of sources and distance between two microphones, bibliographical reference: Y. Izumi, N. Ono, S. Sagayama, gSparseness-based 2ch BSS using the EM Algorithm in Reverberant Environment,h Proc. WASPAA, pp. 147-150, Oct, 2007.