A multi-zone approach to sound field reproduction based on spherical harmonic analysis

Shimizu, Taku; Treviño, Jorge; Sakamoto, Shuichi; Suzuki, Yôiti

doi:10.1250/ast.36.441

Cited by 3 publications

(1 citation statement)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reproduction of such a discontinuous sound field is very demanding in terms of the required number of loudspeakers. To solve this problem, we proposed an extension to HOA called ''shared sound field synthesis'' [9]. The current paper provides a detailed evaluation of this method and is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the extension and coloration of multiple listening zones synthesized by the shared field reproduction system

Shimizu

Treviño

Sakamoto

et al. 2019

Acoust. Sci. & Tech.

Self Cite

View full text Add to dashboard Cite

A conventional sound field synthesis recreates a highly accurate 3D sound space. However, it is difficult to present spatial sound to multiple listeners because an impractical number of loudspeakers is required for a single synthesized field to cover them all. The present research introduces a new approach, termed ''shared sound field synthesis,'' to multi-zone reproduction, which allows multiple users to simultaneously listen to the spatial sound corresponding to a single sound field. The proposed method considers a new kind of multi-zone transfer function in the spherical harmonic domain to characterize the output of each loudspeaker in the reproduction array. These are calculated using a phase compensation formula to account for sound propagation between zones. Numerical simulations show that the proposed method can consistently achieve a two-zone reproduction with a consistent distortion level below À6 dB and is stable with respect to the relative position between the listening zones, except when the zones and target source are aligned. The size of the low distortion is similar to that of the single-zone synthesis obtained through high-order Ambisonics. Moreover, the proposed method dose not proved significant coloration at low frequency or near the center of the listening zones.

show abstract

Section: Introductionmentioning

confidence: 99%

Evaluation of the extension and coloration of multiple listening zones synthesized by the shared field reproduction system

Shimizu

Treviño

Sakamoto

et al. 2019

Acoust. Sci. & Tech.

Self Cite

View full text Add to dashboard Cite

show abstract

Binaural-centered mode-matching method for enhanced reproduction accuracy at listener's both ears in sound field reproduction

Matsuda

Otani

2021

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

This paper proposes a binaural-centered mode-matching (BCMM) method that performs sound field reproduction with two reproduction points, one at each ear. A sound field reproduced by higher-order Ambisonics converges to the target field around a sweet spot whose size is inversely proportional to the frequency when the truncated order of the spherical harmonic expansion is constant. By contrast, BCMM translates the spherical harmonic coefficients on the basis of the addition theorem to realize two reproduction points at both ear positions. The BCMM method thereby avoids degradation of reproduction due to a smaller sweet spot at higher frequencies, as occurs with the conventional method, and thereby, leads to an accurate reproduction at higher frequencies. A comparison of numerical simulations of the binaural signals obtained when rendering with BCMM and conventional methods shows that, compared with the conventional method, the BCMM method improves the reproduction accuracy.

show abstract

Multi-objective optimization for generation of personal sound zone

Cheng

Gao

Pan

et al. 2023

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

Personal Sound Zone (PSZ) allows listeners to enjoy their individual sound without being disturbed by sound from other zones. Acoustic contrast, signal distortion, and array effort are the most frequently used metrics for measuring the performance of a PSZ system. However, usually, the three metrics cannot be optimized at the same time. A trade-off between the three metrics has to be made when designing a PSZ system. In this paper, two generalized methods based on multi-objective optimization are proposed for dealing with all possible trade-off problems between the three metrics in PSZ. Optimality analysis of the two proposed methods is taken, and the relationship between the two proposed methods is investigated. Numerical simulations are presented to validate the efficacy and flexibility of the two proposed methods.

show abstract

A multi-zone approach to sound field reproduction based on spherical harmonic analysis

Cited by 3 publications

References 2 publications

Evaluation of the extension and coloration of multiple listening zones synthesized by the shared field reproduction system

Evaluation of the extension and coloration of multiple listening zones synthesized by the shared field reproduction system

Binaural-centered mode-matching method for enhanced reproduction accuracy at listener's both ears in sound field reproduction

Multi-objective optimization for generation of personal sound zone

Contact Info

Product

Resources

About