Impact of loudspeaker nonlinear distortion on personal sound zones

Ma, Xiaohui; Hegarty, Patrick J.; Pedersen, Jan Abildgaard; Larsen, Jakob Juul

doi:10.1121/1.5019476

Cited by 9 publications

(6 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Second, it smoothly distributes the array effort over the control loudspeakers and limits the magnitude of the resulting control gains. This way realizable solutions where the control loudspeakers play in their approximately linear range can be found by tuning d, as non-linearity must be avoided for good sound field reproduction (Ma et al, 2018).…”

Section: Theory and Methodsmentioning

confidence: 99%

Large-scale outdoor sound field control

Heuchel

Caviedes-Nozal

Brunskog

et al. 2020

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain  You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

show abstract

Section: Theory and Methodsmentioning

confidence: 99%

Large-scale outdoor sound field control

Heuchel

Caviedes-Nozal

Brunskog

et al. 2020

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

show abstract

“…Currently, these systems can be implemented under a fixed or "closed-form" solution, meaning that no changes in the electroacoustical chain can be accounted for. Thus, they are highly sensitive to all kinds of variations such as room temperature [4], loudspeaker non-linearities [5], position of objects and even more, listener movement. In addition, the emerging Internet of Sounds allows to set a wireless acoustical sensor network (WASN) to assist with the sound field control.…”

Section: Introductionmentioning

confidence: 99%

Performance of Low Frequency Sound Zones Based on Truncated Room Impulse Responses

et al. 2022

View full text Add to dashboard Cite

Using spatially distributed loudspeakers and properly designed control filters, it is possible to generate sound zones that play different audio contents in different regions of the same room. For low frequency content, the design of control filters relies on the room impulse responses (RIRs) between each loudspeaker and the desired listening positions. Estimates of the RIRs can be obtained by distributing wireless microphones within the sound zones and thereby systematically acquiring sufficient knowledge about the acoustical characteristics of the room and loudspeakers. Longer acquisition times would generally lead to better estimates of the RIRs but would also introduce processing delays, which is undesirable in cases where time-varying RIRs are to be compensated. In addition, shorter RIRs may imply lower computational complexity.In this work, control filters were calculated using truncated versions of the RIRs in order to simulate the effect of a reduced acquisition time. The performance was evaluated in terms of the acoustic contrast ratio (ACR) and it was seen that within a certain limit, doubling the acquisition time increases the ACR around 4 dB or more. Moreover, to keep the sound pressure low in the dark zone, only a limited part of the reverberation tail is required.

show abstract

“…With time-invariant filters, a general concern is the time dependent variation of the measured room impulse responses (RIRs) after the microphones are removed. Typical degradation of the RIR accuracy include changes in the ambient temperature [6], [20], changes in sound zone location [21], [22], or changes in the electro-dynamic loudspeaker systems [23]. One way to reduce the sensitivity to the temperature and loudspeaker changes is by predicting the effect of the changes and designing the filters to be robust to such changes [24]- [27].…”

mentioning

confidence: 99%

A Moving Horizon Framework for Sound Zones

Møller

Østergaard

2020

IEEE/ACM Trans. Audio Speech Lang. Process.

View full text Add to dashboard Cite

Sound zones are generated to provide independent audio reproduction to multiple people in the same room using loudspeakers. In this paper, sound zones are formulated in terms of a moving horizon framework. This framework allows the reproduction scenario to be time-varying and adapt to changes e.g. in the location of the zones or in the audio signal. The framework is tested using both simulated and measured room impulse responses from eight loudspeakers in a rectangular room. The performance is investigated using signals limited between 35 -500 Hz, but the framework is not limited to a particular frequency range. The experimental results show that it is possible to gain on the order of 4 dB higher separation between the zones using the proposed framework, relative to a conventional timeinvariant solution. This gain arises from knowledge about the audio content currently being reproduced in the zones, and it is obtained without deteriorating the reproduction accuracy or increasing the signal energy injected into the loudspeakers.

show abstract

Impact of loudspeaker nonlinear distortion on personal sound zones

Cited by 9 publications

References 10 publications

Large-scale outdoor sound field control

Large-scale outdoor sound field control

Performance of Low Frequency Sound Zones Based on Truncated Room Impulse Responses

A Moving Horizon Framework for Sound Zones

Contact Info

Product

Resources

About