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Experiments on Multiple-point Room Equalization Applied to Medium-sized Enclosed Spaces

Experiments on Multiple-point Room Equalization Applied to Medium-sized Enclosed Spaces Several solutions for multiple-point acoustic magnitude equalization of medium-sized enclosed spaces are analyzed comparatively. The main design steps are discussed: derivation of the room acoustic prototype, an average of the transfer functions obtained for individual listening points; synthesis of the equalizing filter; characterization of the resulting equalized acoustic chain. First, two approaches for designing the equalizer are presented: a classical synthesis method, which employs the Levinson–Durbin algorithm (LD), and a newer one, based on a genetic algorithm (GA) tailored for the synthesis of FIR filters. Frequency warping able to “stretch” the narrow low-frequency octaves is also considered. A novel experimental setup is proposed to ensure that the equalized acoustic chain’s characterization is performed at the same signal level as the un-equalized chain. A new Figure-of-Merit is introduced that allows for a simple yet intuitive comparison of various equalizing solutions considering both the frequency characteristic and the spatial spread between multiple audition points. Finally, experimental data are presented and analyzed: four equalization solutions (LD- or GA-based, with or without frequency warping) were derived for each of three medium-sized enclosed spaces, with audition areas between 36 and 105 m2, and reverberation times ranging from 0.7 to 3.8 s. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acoustical Physics Springer Journals

Experiments on Multiple-point Room Equalization Applied to Medium-sized Enclosed Spaces

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Publisher
Springer Journals
Copyright
Copyright © Pleiades Publishing, Ltd. 2021. ISSN 1063-7710, Acoustical Physics, 2021, Vol. 67, No. 5, pp. 537–552. © Pleiades Publishing, Ltd., 2021.
ISSN
1063-7710
eISSN
1562-6865
DOI
10.1134/s106377102105002x
Publisher site
See Article on Publisher Site

Abstract

Several solutions for multiple-point acoustic magnitude equalization of medium-sized enclosed spaces are analyzed comparatively. The main design steps are discussed: derivation of the room acoustic prototype, an average of the transfer functions obtained for individual listening points; synthesis of the equalizing filter; characterization of the resulting equalized acoustic chain. First, two approaches for designing the equalizer are presented: a classical synthesis method, which employs the Levinson–Durbin algorithm (LD), and a newer one, based on a genetic algorithm (GA) tailored for the synthesis of FIR filters. Frequency warping able to “stretch” the narrow low-frequency octaves is also considered. A novel experimental setup is proposed to ensure that the equalized acoustic chain’s characterization is performed at the same signal level as the un-equalized chain. A new Figure-of-Merit is introduced that allows for a simple yet intuitive comparison of various equalizing solutions considering both the frequency characteristic and the spatial spread between multiple audition points. Finally, experimental data are presented and analyzed: four equalization solutions (LD- or GA-based, with or without frequency warping) were derived for each of three medium-sized enclosed spaces, with audition areas between 36 and 105 m2, and reverberation times ranging from 0.7 to 3.8 s.

Journal

Acoustical PhysicsSpringer Journals

Published: Sep 1, 2021

Keywords: multiple-point equalization; equalizer synthesis; medium-sized enclosed spaces; metrics for quality of audition

References