Computationally efficient single channel dereverberation based on complementary wiener filter

A single-channel dereverberation method with low computational complexity is proposed. We introduce the complementary Wiener filter which can suppress a late reverberation during silence intervals via theoretical analysis and numerical calculation. An implementation represents reductions both of memory consumption and operative calculations compared to a conventional method; each reduction is almost by half. Dereverberation performance is evaluated by an experimental simulation using speech signals and measured room impulse responses. The performance under several hundreds of msec of the reverberation time is similar to the conventional method: 6 [dB] reverberation reduction and 3 [dB] improvement of target-to-interference ratio.