The city of Tsuyama is located about 100 kilometers west of Kobe. The fundamental shape of the plan and cross sections of the hall were designed by applying the theory of subjective preference [Ando, Architectural Acoustics (AIP Press/Springer-Verlag, New York, 1998)]. Special attempts made in the acoustic design of this hall are: (1) a number of columns distributed in front of the walls at the audience level and on the stage: This may keep a small value of the IACC and a certain initial time delay gap between the direct sound and the first reflection, making an increase of the subjective preference for both listeners and musicians; (2) a stage enclosure with the canopy of several triangular reflectors at adjustable height for musicians, to control the preferred delay time of the reflections in performing a certain type of music; and (3) the shape of the rear wall of the stage, to control the IACC for listeners.
Although a large number of studies have been made on a theory of scattering, no studies have been attempted to evaluate the scattered sound fields in a concert hall. This paper will show an evaluation method of sound fields that involve scattered reflection by a circular-columns array installed in front of both side walls. Measurements were performed by use of a 1/10 scale model of the concert hall. Here, scattered sound fields are evaluated by four acoustic factors (SPL, DT1, Tsub; IACC, and in addition WIACC and tauIACC). It is found that the IACC and Dt1 of the sound fields of the concert hall are improved with use of the circular columns array.
The purpose of this study is to clarify the relationship between the individual preferred delay time of reflection and the effective duration of the autocorrelation function (ACF) of sound source. Subjective preference tests were conducted by varying the delay time of reflection (Δt1) which is one of the four objective parameters related to subjective preference of sound fields. In this paper, five dry sources of instrumental music with different effective duration are used. In addition to the global preference with a number of subjects, individual-preference-scale values also were obtained by the method of paired-comparison tests. An attempt is made here whether or not individual differences in subjective preference may be explained by the categorical classification of musical experience, sex, and age of subjects.
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