複数スピーカシステムによる低周波帯域信号の指向性制御効果

抄録

Omni-directional characteristics of a single loudspeaker and reflection of wall or ceiling affect quality of speech of emergency system using loudspeaker system. A multiple loudspeakers system, that consists of two loudspeakers and fxlms adaptive filter, is proposed for reproducing and propagating uni-directional low frequency sound waves. Experimental results show that the proposed system is effective to control uni-directional propagation, where it consistently can reduce undesired gain more than 10 dB for more than 50 deg beam width for two different configurations.