基于人耳听觉特性的房间冲激响应多点均衡

Multiple-point equalization of room impulse response based on human perception characteristics

在以扬声器-房间系统为代表的音频重放系统中,整个房间的声学特性会受到扬声器的系统响应、房间反射等影响而产生失真。房间冲激响应的失真会影响声音信号的音质,进而降低听者的听音感受,因此必须对房间冲激响应进行均衡。考虑到人耳听觉具有主观性和单点均衡存在的均衡有效区域局限性等问题,提出了基于人耳听觉特性的房间冲激响应多点均衡算法。通过在传统均衡滤波器设计中加入适当响度滤波器,使代价函数由声压转变为响度,实现均衡结果由数学最佳转为听觉最佳。利用在不同位置的房间冲激响应数据进行均衡滤波器的设计,实现从单点均衡到多点均衡的优化,扩大均衡有效区域。

In sound reproduction system such as loudspeaker-room system, the acoustics of the room will affect sound quality. As a result, equalization is essential for room impulse response. Considering the human perception characteris- tics and the limitation of single-point-equalization, this paper presents a new digital faltering approach to the multi- pie-points equalization of room impulse response, which realizes a good match with the psycho-acoustical frequency scale of human hearing. Adding loudness conversion filters to traditional equalizer and transforming the magnitude to loudness results in an optimum effect in auditory scale. Using multiple-points room response data to design the equalizer contributes to improving single-point-equalization and enlarging the effective equalized zone. Finally, the multiple-points equalization of room impulse response based on the human perception characteristics is realized. The experimental results show that the proposed method which is based on the human auditory characteristics can obtain ideal equaliza- tion results, especially in the frequency band where auditory system is sensitive to frequency.