IEICE The Institute of Electronics, Information and Communication Engineers
抄録
ブラインドソースセパレーション(BSS)において現在,フィードフォーワード形(FF-)とフィードバック形(FB-)という2つの回路構造が提案されている.FF-BSSでは自由度が存在するため信号歪みが生じる可能性がある.一方,FB-BSSは本質的に信号歪みを発生しにくい構造であるが,信号源からセンサーまでの遅延時間に条件が課せられる.この観点から,FF-BSSとFB-BSSの信号源分離性能についていろいろな条件下で解析と比較を行い,各々が有効に適用できる範囲を明らかにした. Feed-Forward (FF-) and FeedBack (FB-) structures have been proposed for Blind Source Separation (BSS). The FF-BSS systems have some degree of freedom in the solution space, and signal distortion is likely to occur in convolutive mixtures. On the other hand, FB-BSS structure is hard to cause signal distortion. However, the FB-BSS system requires a condition for the transmission delay time in the mixing process. The FF-BSS systems and the FB-BSS system are compared based on the transmission time delay in the mixing process. Even though the FB-BSS can provide good separation performance, there exit some limitations on location of the signal sources and the sensors.