论文信息 - Reducing seat dip attenuation

Reducing seat dip attenuation

Strategies for reducing seat dip attenuation in concert halls are considered. It is shown that the dip is established 4 ms after the direct sound from the stage arrives at the listener. Sound scattered from the seats and floor is the main cause of the dip. By controlling these very early reflections the attenuation can be reduced to below its subjective threshold. With this in mind, changes to the shape and impedance of the seats and floor are trialed using a boundary element model and a physical scale model. It is found that the seat dip effect can be rendered inaudible by introducing a 1-m pit under the seats. Smaller improvements are produced by changing the impedance of the seat squab.

Davies | Cox

[1] John Vanderkooy,et al. Transfer-Function Measurement with Maximum-Length Sequences , 1989 .

[2] Yasuhito Kawai,et al. Calculation of sound fields over audience seats by using integral equation method , 1991 .

[3] J. West,et al. Sound Transmission over Theatre Seats , 1964 .

[4] Yoichi Ando,et al. Calculations of the sound transmission over theater seats and methods for its improvement in the low‐frequency range , 1982 .

[5] E. Mommertz. EINIGE MESSUNGEN ZUR STREIFENDEN SCHALLAUSBREITUNG UBER PUBLIKUM UND GESTUHL , 1993 .

[6] H. A. Schenck. Improved Integral Formulation for Acoustic Radiation Problems , 1968 .

[7] D. Takahashi. Seat dip effect: The phenomena and the mechanism , 1997 .

[8] T. Terai. On calculation of sound fields around three dimensional objects by integral equation methods , 1980 .

[9] J. S. Bradley. Some further investigations of the seat dip effect , 1991 .

[10] T. J. Schultz,et al. Propagation of Sound across Audience Seating , 1964 .

[11] Joe LoVetri,et al. Modeling of the seat dip effect using the finite‐difference time‐domain method , 1996 .

[12] Yiu W. Lam,et al. New attributes of seat dip attenuation , 1994 .