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Analysis and Design Algorithm of Time Varying Reverberator for Low Memory Applications  

Choi Tack-Sung (Dept., Electrical & Electronic Eng. Yonsei University)
Park Young-Cheol (Dept., Computer & Telecommunications Eng. Yonsei University)
Youn Dae-Hee (Dept., Electrical & Electronic Eng. Yonsei University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.43, no.5, 2006 , pp. 62-71 More about this Journal
Abstract
Development of an artificial reverberation algorithm with low memory requirements has been an issue of importance in applications such as mobile multimedia devices. One possible solution to this problem is to embed a time-varying all-pass filter to the feedback loop of the comb filter. In this paper, theoretical and perceptual analyses of reverberators embedding time-varying all-pass filters are presented. The analyses are to iud a perceptually acceptable degree of phase variation by the all-pass filter. Based on the analyses, we propose a new methodology of designing reverberators embedding time-varying all-pass filters. Through the subjective tests, we showed that, even with smaller memory, the proposed method is capable of providing perceptually comparable sound quality to the conventional methods involving time-invariant parameters.
Keywords
Feedback delay network; Just noticeable frequency variation; Reverberation; Time-varying all-pass filter;
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