Low frequency sound field control in rectangular listening rooms using CABS (Controlled Acoustic Bass System) will also reduce sound transmission to neighbor rooms

Sofus Birkedal Nielsen, Adrian Celestinos

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Resumé

Sound reproduction is often taking place in small and medium sized rectangular rooms. As rectangular rooms have 3 pairs of parallel walls the reflections at especially low frequencies will cause up to 30 dB spatial variations of the sound pressure level in the room. This will take place not only at resonance frequencies, but more or less at all frequencies. A time based room correction system named CABS (Controlled Acoustic Bass System) has been developed and is able to create a homogeneous sound field in the whole room at low frequencies by proper placement of multiple loudspeakers. A normal setup using CABS is based on 2 loudspeakers like a stereo setup placed close to a wall so a plane wave is created from the front wall at low frequencies. At the opposite wall another 2 loudspeakers are placed playing the same low frequency part of the signal, but processed in order to cancel the reflection from the rear wall, and thereby leaving only the plane wave in the room. With a room size of (7.8 x 4.1 x 2.8) m. it is possible to prevent modal frequencies up to 100 Hz. An investigation has shown that the sound transmitted to a neighbour room also will be reduced if CABS is used. The principle and the understanding of why and how it works will also be discussed. CABS is controlled by a developed DSP (Digital Signal Processing) system.
OriginalsprogEngelsk
TitelProceedings of Forum Acusticum 2011
ForlagEuropean Acoustics Association - EAA
Publikationsdato2011
Sider317-322
ISBN (Trykt)978-84-694-1520-7
StatusUdgivet - 2011
BegivenhedForum Acusticum 2011 - Aalborg, Danmark
Varighed: 27 jun. 20111 jul. 2011
Konferencens nummer: 6

Konference

KonferenceForum Acusticum 2011
Nummer6
LandDanmark
ByAalborg
Periode27/06/201101/07/2011
NavnForum Acusticum

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sound transmission
sound fields
rooms
low frequencies
acoustics
loudspeakers
plane waves
sound pressure
signal processing
causes

Citer dette

Nielsen, S. B., & Celestinos, A. (2011). Low frequency sound field control in rectangular listening rooms using CABS (Controlled Acoustic Bass System) will also reduce sound transmission to neighbor rooms. I Proceedings of Forum Acusticum 2011 (s. 317-322). European Acoustics Association - EAA. Forum Acusticum
Nielsen, Sofus Birkedal ; Celestinos, Adrian. / Low frequency sound field control in rectangular listening rooms using CABS (Controlled Acoustic Bass System) will also reduce sound transmission to neighbor rooms. Proceedings of Forum Acusticum 2011. European Acoustics Association - EAA, 2011. s. 317-322 (Forum Acusticum).
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abstract = "Sound reproduction is often taking place in small and medium sized rectangular rooms. As rectangular rooms have 3 pairs of parallel walls the reflections at especially low frequencies will cause up to 30 dB spatial variations of the sound pressure level in the room. This will take place not only at resonance frequencies, but more or less at all frequencies. A time based room correction system named CABS (Controlled Acoustic Bass System) has been developed and is able to create a homogeneous sound field in the whole room at low frequencies by proper placement of multiple loudspeakers. A normal setup using CABS is based on 2 loudspeakers like a stereo setup placed close to a wall so a plane wave is created from the front wall at low frequencies. At the opposite wall another 2 loudspeakers are placed playing the same low frequency part of the signal, but processed in order to cancel the reflection from the rear wall, and thereby leaving only the plane wave in the room. With a room size of (7.8 x 4.1 x 2.8) m. it is possible to prevent modal frequencies up to 100 Hz. An investigation has shown that the sound transmitted to a neighbour room also will be reduced if CABS is used. The principle and the understanding of why and how it works will also be discussed. CABS is controlled by a developed DSP (Digital Signal Processing) system.",
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Nielsen, SB & Celestinos, A 2011, Low frequency sound field control in rectangular listening rooms using CABS (Controlled Acoustic Bass System) will also reduce sound transmission to neighbor rooms. i Proceedings of Forum Acusticum 2011. European Acoustics Association - EAA, Forum Acusticum, s. 317-322, Forum Acusticum 2011, Aalborg, Danmark, 27/06/2011.

Low frequency sound field control in rectangular listening rooms using CABS (Controlled Acoustic Bass System) will also reduce sound transmission to neighbor rooms. / Nielsen, Sofus Birkedal; Celestinos, Adrian.

Proceedings of Forum Acusticum 2011. European Acoustics Association - EAA, 2011. s. 317-322 (Forum Acusticum).

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

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Nielsen SB, Celestinos A. Low frequency sound field control in rectangular listening rooms using CABS (Controlled Acoustic Bass System) will also reduce sound transmission to neighbor rooms. I Proceedings of Forum Acusticum 2011. European Acoustics Association - EAA. 2011. s. 317-322. (Forum Acusticum).