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任英彬,朴昌燮 釜山工業大學校 1990 論文集 Vol.32 No.-
Sabine's Reverberation time was for a long Time regarded as the principal objective quantity in the acoustical design of halls and auditorial. It is now generally accepted that it is not the sole design quantity as an acoustical criterion for halls. Sound reflection in a room naturally play a very important role in subjective evaluation of acoustic performance of the room and favourable reflections should be provided by the walls and ceilings. It is very important for listeners to receive early high-frequency reflections with 20millisconds of the arrival of the direct orchestral sound for them to experience optimum musical presence and definition. The difference in time between the arrival of direct sound and the first reflection is called the initial time delay gap(ITDG). The ITDG is related to the size and shape of a concert hall. This paper presents the value of ITDG by the experimental model. The Main hall of A Cultual center was used for the paper. The experimental method were used by geometrical and impulse response.