Study on echo suppression effect and coloration due to periodic-type diffusers

摘要: An echo is one of the obstacles in halls and theatres. In order to suppress this undesirable echo, walls ceilings have been often given absorptive surfaces which absorb sound energy or corrugated provide wave diffusion. While it not difficult predict degree suppression effects case surfaces, generally do that surfaces. addition, if periodicity, unintended called coloration can distort tonal characteristics field. Thus, many acoustic designers would hesitate employ kind periodic-type diffusers. However, there are some cases where necessary echoes without any loss. Periodic-type diffusers advantages easy estimation diffusion properties, simple method design, ready availability. study, a subjective experiment with simulated stimuli was carried out clarify effect from viewpoint reflected level. Although interfered judgments experiment, shown does occur. This study also devoted discussion about causes features coloration.