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Olik M, Jackson PJ, Coleman P, et al. Optimal source placement for sound zone reproduction with first order reflections. J Acoust Soc Am. 2014;136(6):3085doi: 10.1121/1.4898423.
Olik, M., Jackson, P. J., Coleman, P., & Pedersen, J. A. (2014). Optimal source placement for sound zone reproduction with first order reflections. The Journal of the Acoustical Society of America, 136(6), 3085. https://doi.org/10.1121/1.4898423
Olik, Marek, et al. "Optimal source placement for sound zone reproduction with first order reflections." The Journal of the Acoustical Society of America vol. 136,6 (2014): 3085. doi: https://doi.org/10.1121/1.4898423
Olik M, Jackson PJ, Coleman P, Pedersen JA. Optimal source placement for sound zone reproduction with first order reflections. J Acoust Soc Am. 2014 Dec;136(6):3085. doi: 10.1121/1.4898423. PMID: 25480057.
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J Acoust Soc Am. 2014 Dec;136(6):3085. doi: 10.1121/1.4898423.

Optimal source placement for sound zone reproduction with first order reflections.

The Journal of the Acoustical Society of America

Marek Olik, Philip J B Jackson, Philip Coleman, Jan Abildgaard Pedersen

Affiliations

  1. Centre for Vision, Speech and Signal Processing, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
  2. Bang & Olufsen A/S, Peter Bangs Vej 15, DK7600, Struer, Denmark.

PMID: 25480057 DOI: 10.1121/1.4898423

Abstract

The problem of delivering personal audio content to listeners sharing the same acoustic space has recently attracted attention. It has been shown that a perceptually acceptable level of acoustic separation between the listening zones is difficult to achieve with active control in non-anechoic conditions. A common problem of strong first order reflections has not been examined in detail for systems with practical constraints. Acoustic contrast maximization combined with optimization of source positions is identified as a potentially effective control strategy when strong individual reflections occur. An analytic study is carried out to describe the relationship between the performance of a 2 × 2 (two sources and two control sensors) system and its geometry in a single-reflection scenario. The expression for acoustic contrast is used to formulate guidelines for optimizing source positions, based on three distinct techniques: Null-Split, Far-Align, and Near-Align. The applicability of the techniques to larger systems with up to two reflections is demonstrated using numerical optimization. Simulation results show that optimized systems produce higher acoustic contrast than non-optimized source arrangements and an alternative method for reducing the impact of reflections (sound power minimization).

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