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

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 characteristics and the limitation of single-point-equalization, this paper presents a new digital filtering approach to the multiple-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 equalization results, especially in the frequency band where auditory system is sensitive to frequency.