On Analytic Methods for 2.5-D Local Sound Field Synthesis Using Circular Distributions of Secondary Sources

Winter, Fiete; Ahrens, Jens; Spors, Sascha

doi:10.1109/taslp.2016.2531902

Cited by 15 publications

(6 citation statements)

References 13 publications

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“…The upper frequency from (9) agrees with [10] and is dependent on the number of loudspeakers, the reproduction radius and the angle subtending the loudspeaker arc.…”

Section: Soundfield Reproduction Aliasingsupporting

confidence: 59%

“…A fundamental issue with reproducing soundfields using a limited number of loudspeakers is spatial aliasing which gives rise to grating lobes which may impede the quiet zone at higher frequencies [10]. Due to this phenomenon, the bandwidth of reproducible soundfields with high acoustic contrast (which may be lost above the aliasing frequency) is reduced.…”

Section: Soundfield Reproduction Aliasingmentioning

confidence: 99%

“…A fundamental issue with MSR using discrete secondary sources is that the spatial aliasing induces so-called grating lobes which can interfere across zones [10]. Recent research [6], [8], [11] suggests a full circle array of ≈ 300 loudspeakers are required to reproduce audio up to 8 kHz with high acoustic contrast.…”

Section: Introductionmentioning

confidence: 99%

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Reproducing personal sound zones using a hybrid synthesis of dynamic and parametric loudspeakers

Donley

Ritz

Kleijn

2016

2016 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA)

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This paper proposes a hybrid approach to personal sound zones utilising multizone soundfield reproduction techniques and parametric loudspeakers. Crossover filters are designed, to switch between reproduction methods, through analytical analysis of aliasing artifacts in multizone reproductions. By realising the designed crossover filters, wideband acoustic contrast between zones is significantly improved. The trade-off between acoustic contrast and the bandwidth of the reproduced soundfield is investigated. Results show that by incorporating the proposed hybrid model the whole wideband bandwidth is spatial-aliasing free with a mean acoustic contrast consistently above 54.2dB, an improvement of up to 24.2dB from a non-hybrid approach, with as few as 16 dynamic loudspeakers and one parametric loudspeaker. Abstract-This paper proposes a hybrid approach to personal sound zones utilising multizone soundfield reproduction techniques and parametric loudspeakers. Crossover filters are designed, to switch between reproduction methods, through analytical analysis of aliasing artifacts in multizone reproductions. By realising the designed crossover filters, wideband acoustic contrast between zones is significantly improved. The trade-off between acoustic contrast and the bandwidth of the reproduced soundfield is investigated. Results show that by incorporating the proposed hybrid model the whole wideband bandwidth is spatial-aliasing free with a mean acoustic contrast consistently above 54.2dB, an improvement of up to 24.2dB from a nonhybrid approach, with as few as 16 dynamic loudspeakers and one parametric loudspeaker.

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“…The upper frequency from (9) agrees with [10] and is dependent on the number of loudspeakers, the reproduction radius and the angle subtending the loudspeaker arc.…”

Section: Soundfield Reproduction Aliasingsupporting

confidence: 59%

Section: Soundfield Reproduction Aliasingmentioning

confidence: 99%

See 1 more Smart Citation

Reproducing personal sound zones using a hybrid synthesis of dynamic and parametric loudspeakers

Donley

Ritz

Kleijn

2016

2016 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA)

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“…Therefore, NFC-HOA can be considered as a sound field synthesis technique aiming at an accurate synthesis within a local region, called local sound field synthesis. The location of the local listening area can be moved by re-expanding the sound field with respect to the center of the respective local listening area [11], [12].…”

Section: Introduction Wave Field Synthesis (Wfs) and Near-field Comentioning

confidence: 99%

Synthesis of a spatially band-limited plane wave in the time-domain using wave field synthesis

Hahn

Winter

Spors

2017

2017 25th European Signal Processing Conference (EUSIPCO)

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Abstract-Wave Field Synthesis (WFS) is a spatial sound reproduction technique aiming at a physically accurate reconstruction of a desired sound field within an extended listening area. It was shown in a recent study that the accuracy of the synthesized sound field can be improved in a local area by applying a spatial band-limitation to the driving function. However, the computational complexity of the frequency-domain driving function is demanding because of the involved Bessel functions. In this paper, a time-domain WFS driving function is introduced for the synthesis of a spatially band-limited plane wave. The driving function is obtained based on a time-domain representation of the sound field which is given as a superposition of plane waves with time-varying direction and amplitude. The performance of the proposed approach is evaluated by numerical simulations. Practical issues regarding the discretization of the analytic driving function and dynamic range control are discussed.

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“…However, this would result in a significant increase in computational complexity due to the large number of transducers required for spherical arrays. Furthermore, the 2.5D formulation with a control region at the height of a human ear is a commonly used and practical setup in both soundfield reproduction[43],[44],[45],[46] and spatial ANC[11],[17],[21] applications.…”

mentioning

confidence: 99%

Spatial Noise-Field Control With Online Secondary Path Modeling: A Wave-Domain Approach

Zhang

Hofmann

Buerger

et al. 2018

IEEE/ACM Trans. Audio Speech Lang. Process.

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Due to strong inter-channel interference in multichannel ANC, there are fundamental problems associated with the filter adaptation and online secondary path modelling remains a major challenge. This paper proposes a wave-domain adaptation algorithm for multichannel ANC with online secondary path modelling to cancel tonal noise over an extended region of 2D plane in a reverberant room. The design is based on exploiting the diagonal-dominance property of the secondary path in the wave domain. The proposed wave-domain secondary path model is applicable to both concentric and non-concentric circular loudspeaker and microphone array placement and is also robust against array positioning errors. Normalized least mean squarestype algorithms are adopted for adaptive feedback control. Computational complexity is analyzed and compared with the conventional time-domain and frequency-domain multichannel ANC. Through simulation-based verification in comparison with existing methods, the proposed algorithm demonstrates more efficient adaptation with low-level auxiliary noise.

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On Analytic Methods for 2.5-D Local Sound Field Synthesis Using Circular Distributions of Secondary Sources

Cited by 15 publications

References 13 publications

Reproducing personal sound zones using a hybrid synthesis of dynamic and parametric loudspeakers

Reproducing personal sound zones using a hybrid synthesis of dynamic and parametric loudspeakers

Synthesis of a spatially band-limited plane wave in the time-domain using wave field synthesis

Spatial Noise-Field Control With Online Secondary Path Modeling: A Wave-Domain Approach

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