TY - JOUR

T1 - A note on the modal kurtosis and the concentration factor in reverberation rooms

A1 - Jacobsen,Finn

AU - Jacobsen,Finn

PB - Acoustical Society of America

PY - 2012

Y1 - 2012

N2 - The effect known as “weak Anderson localization,” “coherent backscattering,” or “enhanced back-scattering” is a physical phenomenon that occurs in random systems, e.g., disordered media and linear wave systems, including reverberation rooms: The mean square response is increased at the drive point. In a reverberation room, this means that one can expect an increase of the reverberant sound field at the position of the source that generates the sound field. This affects the sound power output of the source and is therefore of practical concern. The relative increase of reverberant energy is described by the concentration factor, which is usually assumed to be 2. However, because of the stronger direct sound field at the source position, it is obviously very difficult to measure this quantity directly under steady-state conditions. A related parameter of crucial importance for the ensemble statistics of responses in rooms is the modal kurtosis, which is usually assumed to be 3. The modal kurtosis is also very difficult to measure directly. This paper presents the results of an indirect experimental estimation of the two parameters. <br/>

AB - The effect known as “weak Anderson localization,” “coherent backscattering,” or “enhanced back-scattering” is a physical phenomenon that occurs in random systems, e.g., disordered media and linear wave systems, including reverberation rooms: The mean square response is increased at the drive point. In a reverberation room, this means that one can expect an increase of the reverberant sound field at the position of the source that generates the sound field. This affects the sound power output of the source and is therefore of practical concern. The relative increase of reverberant energy is described by the concentration factor, which is usually assumed to be 2. However, because of the stronger direct sound field at the source position, it is obviously very difficult to measure this quantity directly under steady-state conditions. A related parameter of crucial importance for the ensemble statistics of responses in rooms is the modal kurtosis, which is usually assumed to be 3. The modal kurtosis is also very difficult to measure directly. This paper presents the results of an indirect experimental estimation of the two parameters. <br/>

KW - Acoustic field

KW - Architectural acoustics

KW - Backscatter

KW - Reverberation

U2 - 10.1121/1.3693657

DO - 10.1121/1.3693657

JO - Acoustical Society of America. Journal

JF - Acoustical Society of America. Journal

SN - 0001-4966

IS - 4

VL - 131

SP - 2565

EP - 2569

ER -