Problems with the Existing DUET System

Though the authors demonstrate significant accuracy in obtaining the mixing parameters from the weighted histogram approach, the nearest neighbor demixing algorithm suffers in cases where W-disjoint orthogonality is slightly violated. Specifically, if two sources contribute to the energy in a particular bin in a given frame, the parameter estimates generated by equation 1 will in fact lie between those of the contributing sources. In some cases, this result will generate mixing parameter estimates whose nearest neighbor source is actually a third source not present in the signal. In other cases, the result will appear to be distant from any source's mixing parameters. This is problematic for two reasons. First, there is no way to reliably detect even one of the genuinely contributing sources in such cases. Second, we may spuriously assign energy to a third source that is not contributing.