Low frequency sound reproduction in irregular rooms using CABS (Control Acoustic Bass System)

Adrian Celestinos, Sofus Birkedal Nielsen

Publikation: Bidrag til tidsskriftKonferenceabstrakt i tidsskriftForskningpeer review

1 Citation (Scopus)
322 Downloads (Pure)

Resumé

Early investigations on low frequency sound reproduction in rectangular rooms using CABS (Controlled Acoustic Bass System) have shown good results on simulations and measurements in real rooms. CABS takes the advantage of having a rectangular room with parallel walls. By using two low frequency loudspeakers well positioned at the end of the room a virtual array is formed propagating plane waves along the length of the room in one direction. This will correct the sound field distribution in the room. When plane wave arrives to the end wall two more loudspeakers have to be placed connected with the same signal in counter phase and with a delay corresponding to approximately the length of the room. This is to cancel the reflection and maintain the plane wave propagating along the room. Real life rooms are not necessary rectangular and can be of different shapes. In this paper simulations of an irregular room model using the FDTD (Finite Difference Time Domain) method has been presented. CABS has been simulated in the irregular room model. Measurements of CABS in a real irregular room have been performed. The performance of CABS was affected by the irregular shape of the room due to the corner diffracting the plane wave. Nevertheless CABS improves spatial and magnitude deviations.
OriginalsprogEngelsk
TidsskriftAcustica United with Acta Acustica
Vol/bind97
Udgave nummerSupplement 1
Sider (fra-til)S 35
ISSN1610-1928
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

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rooms
low frequencies
acoustics
loudspeakers
plane waves
Acoustics
Sound
Irregular
deviation
Waves
sound fields
finite difference time domain method
counters
simulation
Deviation
Length
Simulation

Citer dette

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Low frequency sound reproduction in irregular rooms using CABS (Control Acoustic Bass System). / Celestinos, Adrian; Nielsen, Sofus Birkedal.

I: Acustica United with Acta Acustica, Bind 97, Nr. Supplement 1, 2011, s. S 35.

Publikation: Bidrag til tidsskriftKonferenceabstrakt i tidsskriftForskningpeer review

TY - ABST

T1 - Low frequency sound reproduction in irregular rooms using CABS (Control Acoustic Bass System)

AU - Celestinos, Adrian

AU - Nielsen, Sofus Birkedal

PY - 2011

Y1 - 2011

N2 - Early investigations on low frequency sound reproduction in rectangular rooms using CABS (Controlled Acoustic Bass System) have shown good results on simulations and measurements in real rooms. CABS takes the advantage of having a rectangular room with parallel walls. By using two low frequency loudspeakers well positioned at the end of the room a virtual array is formed propagating plane waves along the length of the room in one direction. This will correct the sound field distribution in the room. When plane wave arrives to the end wall two more loudspeakers have to be placed connected with the same signal in counter phase and with a delay corresponding to approximately the length of the room. This is to cancel the reflection and maintain the plane wave propagating along the room. Real life rooms are not necessary rectangular and can be of different shapes. In this paper simulations of an irregular room model using the FDTD (Finite Difference Time Domain) method has been presented. CABS has been simulated in the irregular room model. Measurements of CABS in a real irregular room haven been performed. The performance of CABS was affected by the irregular shape of the room due to the corner diffracting the plane wave. Nevertheless CABS improves spatial and magnitude deviations. In general it was observed that the symmetrical place of the rear loudspeakers was not necessary the best placement. The deviations suggest that the amplitude and the delay to each of the rear loudspeakers need to be slightly different.

AB - Early investigations on low frequency sound reproduction in rectangular rooms using CABS (Controlled Acoustic Bass System) have shown good results on simulations and measurements in real rooms. CABS takes the advantage of having a rectangular room with parallel walls. By using two low frequency loudspeakers well positioned at the end of the room a virtual array is formed propagating plane waves along the length of the room in one direction. This will correct the sound field distribution in the room. When plane wave arrives to the end wall two more loudspeakers have to be placed connected with the same signal in counter phase and with a delay corresponding to approximately the length of the room. This is to cancel the reflection and maintain the plane wave propagating along the room. Real life rooms are not necessary rectangular and can be of different shapes. In this paper simulations of an irregular room model using the FDTD (Finite Difference Time Domain) method has been presented. CABS has been simulated in the irregular room model. Measurements of CABS in a real irregular room haven been performed. The performance of CABS was affected by the irregular shape of the room due to the corner diffracting the plane wave. Nevertheless CABS improves spatial and magnitude deviations. In general it was observed that the symmetrical place of the rear loudspeakers was not necessary the best placement. The deviations suggest that the amplitude and the delay to each of the rear loudspeakers need to be slightly different.

M3 - Conference abstract in journal

VL - 97

SP - S 35

JO - Acustica United with Acta Acustica

JF - Acustica United with Acta Acustica

SN - 1610-1928

IS - Supplement 1

ER -