The authors examined adequate solid angle partitioning methods and simple methods to predict the time from the reflection of sound in rooms until diffusion is attained in order to apply reverberation addition methods taking the reflection time structure previously proposed by authors into consideration to numerical simulation. We furthermore pointed out the effectiveness of reverberation addition methods by means of comparative hearing tests using sound fields synthesized from impulse response of reverberation added to early reflections from numerical simulation and actually measured impulse response.
