Pressure Matching With Forced Filters for Personal Sound Zones Application

Vindrola, Lucas; Melon, Manuel; Chamard, Jean-Christophe; Gazengel, Bruno

doi:10.17743/jaes.2020.0058

Cited by 8 publications

(18 citation statements)

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“…The target selected for the bright zone heavily influences the performance of WPM, however, this is an aspect that has not been extensively studied in the PSZ related literature. The most common approach in reverberant environments is to select the target as the delayed response from one of the loudspeakers to all of the control points in the bright zone [14][15][16][19][20][21] , i.e.,…”

Section: Target Selectionmentioning

confidence: 99%

“…However, this is an aspect that, to the best of our knowledge, has not been previously studied in the literature. The most usual approach in reverberant environments is to select the target as the Room Impulse Response (RIR) produced by one of the speakers of the system in the control points of the bright zone [14][15][16][19][20][21] . This approach aims to synthesize all the direct and reverberant components of the RIR in the bright zone while minimizing the energy in the dark zone.…”

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confidence: 99%

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Weighted pressure matching with windowed targets for personal sound zones

Moles-Cases

Elliott

Cheer

et al. 2022

The Journal of the Acoustical Society of America

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Personal sound zones (PSZ) systems use an array of loudspeakers to render independent audio signals to multiple listeners within a room. The performance of a PSZ system, designed using weighted pressure matching, depends on the selected target responses for the bright zone. In reverberant environments, the target responses are generally chosen to be the room impulse responses from one of the loudspeakers to the control points in the selected bright zone. This approach synthesizes the direct propagation component and all the reverberant components in the bright zone, while minimizing the energy in the dark zone. We present a theoretical analysis to show that high energy differences cannot be achieved for the diffuse reverberant components in the bright and dark zones, and so trying to synthesize these components in the bright zone does not lead to the best performance. It is then shown that the performance can be improved by using windowed versions of these measured impulse responses as target signals, in order to control which reverberant components are synthesized in the bright zone and which are not. This observation is supported by experimental measurements in two scenarios with different levels of reverberation.

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Section: Target Selectionmentioning

confidence: 99%

mentioning

confidence: 99%

Weighted pressure matching with windowed targets for personal sound zones

Moles-Cases

Elliott

Cheer

et al. 2022

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

show abstract

“…However, this is an aspect that, to the best of our knowledge, has not been previously studied in the literature. The most usual approach in reverberant environments is to select the target for the bright zone as the Room Impulse Response (RIR) produced by one of the loudspeakers of the system [39,52,57,60,131]. This approach aims to synthesize all the direct and reverberant components of the RIR in the bright zone while minimizing the energy in the dark zone.…”

Section: Weighted Pressure Matching With Windowed Targets a Amentioning

confidence: 99%

“…The performance can be heavily degraded when using such a restrictive target, especially in reverberant environments, because in this case low error in the bright zone can only be achieved at the cost of important degradations in the acoustic contrast. The most common approach in reverberant environments is to select the target impulse responses for the bright zone as the delayed RIRs from one of the loudspeakers of the system to all of the control points in the bright zone [39,52,57,60,131]. Next, we review this approach, and later, we propose an alternative method in which the targets for the bright zone are windowed.…”

Section: Target Selectionmentioning

confidence: 99%

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Filter Optimization for Personal Sound Zones Systems

Cases¹

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Personal Sound Zones (PSZ) systems deliver different sounds to a number of listeners sharing an acoustic space through the use of loudspeakers together with signal processing techniques. These systems have attracted a lot of attention in recent years because of the wide range of applications that would benefit from the generation of individual listening zones, e.g., domestic or automotive audio applications. A key aspect of PSZ systems, at least for low and mid frequencies, is the optimization of the filters used to process the sound signals. Different algorithms have been proposed in the literature for computing those filters, each exhibiting some advantages and disadvantages. In this work, the state-of-the-art algorithms for PSZ systems are reviewed, and their performance in a reverberant environment is evaluated. Aspects such as the acoustic isolation between zones, the reproduction error, the energy of the filters, and the delay of the system are considered in the evaluations. Furthermore, computationally efficient strategies to obtain the filters are studied, and their computational complexity is compared too. The performance and computational evaluations reveal the main limitations of the state-of-the-art algorithms. In particular, the existing solutions can not offer low computational complexity and at the same time good performance for short system delays. Thus, a novel algorithm based on subband filtering that mitigates these limitations is proposed for PSZ systems. In addition, the proposed algorithm offers more versatility than the existing algorithms, since different system configurations, such as different filter lengths or sets of loudspeakers, can be used in each subband. The proposed algorithm is experimentally evaluated and tested in a reverberant environment, and its efficacy to mitigate the limitations of the existing solutions is demonstrated. Finally, the effect of the target responses in the optimization is discussed, and a novel approach that is based on windowing the target responses is proposed. The proposed approach is experimentally evaluated in two rooms with different reverberation levels. The evaluation results reveal that an appropriate windowing of the target responses can reduce the interference level between zones.

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Performance Optimization of Personal Sound Zones with Crosstalk Cancellation

Qiao,

Choueiri

2023

2023 Immersive and 3D Audio: From Architecture to Automotive (I3DA)

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Pressure Matching With Forced Filters for Personal Sound Zones Application

Cited by 8 publications

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Weighted pressure matching with windowed targets for personal sound zones

Weighted pressure matching with windowed targets for personal sound zones

Filter Optimization for Personal Sound Zones Systems

Performance Optimization of Personal Sound Zones with Crosstalk Cancellation

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