Artificial reverberation algorithm to control distance of phantom sound source for surround audio system

서라운드 오디오 시스템을 위한 가상음원의 거리를 조절할 수 있는 인공잔향기

  • Shim, Hwan (School of Electrical Engineering and Computer Science, Seoul National University) ;
  • Seo, Jeong-Hun (School of Electrical Engineering and Computer Science, Seoul National University) ;
  • Sung, Koeng-Mo (School of Electrical Engineering and Computer Science, Seoul National University)
  • 심환 (서울대학교 공과대학 전기컴퓨터공학부) ;
  • 서정훈 (서울대학교 공과대학 전기컴퓨터공학부) ;
  • 성굉모 (서울대학교 공과대학 전기컴퓨터공학부)
  • Published : 2005.11.26

Abstract

Multi-channel artificial reverberation algorithm to control perceived direction and distance is described in this paper. In conventional algorithms using IIR filters, reverberation time is the only parameter to be controlled. Moreover, since the convolution-based conventional algorithms apply only same impulse responses, but not considering sound localization, it was not realistic enough. The new algorithm proposed in this paper utilizes early reflections segmented according to the azimuth from which direct sound comes and controls perceived direction by panning the direct sound, and controls perceived distance by adjusting Energy Decay Curve (EDC) of reverberation and gain of the direct sound. In addition, the algorithm enhances Listener Envelopment(LEV) to make late reverberation incoherent among channels.

Keywords