Blind signal separation using QMF

Blind signal separation method is the method that the source signals are obtained by separating only the mixed signals. Generally, separation precision is lower when blind signal separation method is used for the sound signals. It is the cause that the power of the sound signals is concentrated in the low-frequency band. Specifically, the high-frequency band has over separation when the separation to be suitable for the low-frequency band is performed, and the separation of the low-frequency band is insufficient when the separation to be suitable for the high-frequency band is performed. Then, in this paper, we propose the method that has higher separation precision. The proposed method is as follows: 1) divide the mixed signals into the signals of the high-frequency band and the signals of the low-frequency band, 2) separate each of the divided signals, 3) reconstruct the regenerated source signals from each of the separated signals. We evaluate the proposed method by computer simulation.