Design of Time-Varying Reverberators for Low Memory Applications

Tacksung CHOI; Young-Cheol PARK; Dae-Hee YOUN

doi:10.1093/ietisy/e91-d.2.379

Design of Time-Varying Reverberators for Low Memory Applications

Tacksung CHOI, Young-Cheol PARK, Dae-Hee YOUN

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Development of an artificial reverberator for low-memory requirements is an issue of importance in applications such as mobile multimedia devices. One possibility is to use an All-Pass Filter (APF), which is embedded in the feedback loop of the comb filter network. In this paper, we propose a reverberator employing time-varying APFs to increase the reverberation performance. By changing the gain of the APF, we can increase the number of frequency peaks perceptually. Thus, the resulting reverberation sounds much more natural, even with less memory, than the conventional approach. In this paper, we perform theoretical and perceptual analyses of artificial reverberators employing time-varying APF. Through the analyses, we derive the degree of phase variation of the APF that is perceptually acceptable. Based on the analyses, we propose a method of designing artificial reverberators associated with the time-varying APFs. Through subjective tests, it is shown that the proposed method is capable of providing perceptually comparable sound quality to the conventional methods even though it uses less memory.

Publication: IEICE TRANSACTIONS on Information Vol.E91-D No.2 pp.379-382

Publication Date: 2008/02/01

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Online ISSN: 1745-1361

DOI: 10.1093/ietisy/e91-d.2.379

Type of Manuscript: LETTER

Category: Music Information Processing

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Tacksung CHOI, Young-Cheol PARK, Dae-Hee YOUN, "Design of Time-Varying Reverberators for Low Memory Applications" in IEICE TRANSACTIONS on Information, vol. E91-D, no. 2, pp. 379-382, February 2008, doi: 10.1093/ietisy/e91-d.2.379.
Abstract: Development of an artificial reverberator for low-memory requirements is an issue of importance in applications such as mobile multimedia devices. One possibility is to use an All-Pass Filter (APF), which is embedded in the feedback loop of the comb filter network. In this paper, we propose a reverberator employing time-varying APFs to increase the reverberation performance. By changing the gain of the APF, we can increase the number of frequency peaks perceptually. Thus, the resulting reverberation sounds much more natural, even with less memory, than the conventional approach. In this paper, we perform theoretical and perceptual analyses of artificial reverberators employing time-varying APF. Through the analyses, we derive the degree of phase variation of the APF that is perceptually acceptable. Based on the analyses, we propose a method of designing artificial reverberators associated with the time-varying APFs. Through subjective tests, it is shown that the proposed method is capable of providing perceptually comparable sound quality to the conventional methods even though it uses less memory.
URL: https://global.ieice.org/en_transactions/information/10.1093/ietisy/e91-d.2.379/_p

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@ARTICLE{e91-d_2_379,
author={Tacksung CHOI, Young-Cheol PARK, Dae-Hee YOUN, },
journal={IEICE TRANSACTIONS on Information},
title={Design of Time-Varying Reverberators for Low Memory Applications},
year={2008},
volume={E91-D},
number={2},
pages={379-382},
abstract={Development of an artificial reverberator for low-memory requirements is an issue of importance in applications such as mobile multimedia devices. One possibility is to use an All-Pass Filter (APF), which is embedded in the feedback loop of the comb filter network. In this paper, we propose a reverberator employing time-varying APFs to increase the reverberation performance. By changing the gain of the APF, we can increase the number of frequency peaks perceptually. Thus, the resulting reverberation sounds much more natural, even with less memory, than the conventional approach. In this paper, we perform theoretical and perceptual analyses of artificial reverberators employing time-varying APF. Through the analyses, we derive the degree of phase variation of the APF that is perceptually acceptable. Based on the analyses, we propose a method of designing artificial reverberators associated with the time-varying APFs. Through subjective tests, it is shown that the proposed method is capable of providing perceptually comparable sound quality to the conventional methods even though it uses less memory.},
keywords={},
doi={10.1093/ietisy/e91-d.2.379},
ISSN={1745-1361},
month={February},}

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TY - JOUR
TI - Design of Time-Varying Reverberators for Low Memory Applications
T2 - IEICE TRANSACTIONS on Information
SP - 379
EP - 382
AU - Tacksung CHOI
AU - Young-Cheol PARK
AU - Dae-Hee YOUN
PY - 2008
DO - 10.1093/ietisy/e91-d.2.379
JO - IEICE TRANSACTIONS on Information
SN - 1745-1361
VL - E91-D
IS - 2
JA - IEICE TRANSACTIONS on Information
Y1 - February 2008
AB - Development of an artificial reverberator for low-memory requirements is an issue of importance in applications such as mobile multimedia devices. One possibility is to use an All-Pass Filter (APF), which is embedded in the feedback loop of the comb filter network. In this paper, we propose a reverberator employing time-varying APFs to increase the reverberation performance. By changing the gain of the APF, we can increase the number of frequency peaks perceptually. Thus, the resulting reverberation sounds much more natural, even with less memory, than the conventional approach. In this paper, we perform theoretical and perceptual analyses of artificial reverberators employing time-varying APF. Through the analyses, we derive the degree of phase variation of the APF that is perceptually acceptable. Based on the analyses, we propose a method of designing artificial reverberators associated with the time-varying APFs. Through subjective tests, it is shown that the proposed method is capable of providing perceptually comparable sound quality to the conventional methods even though it uses less memory.
ER -