Abstract
A rest room is required in comfortable living space. So this paper describes the improvement of sound quality of toilet flushing sound. An acrylic board model is made for taking a picture of the flushing mechanism by a high-speed video camera. It is found that the flushing sound generates broken bubble in water current, and the frequency characteristics of the sound depend on the size of the bubble. The relationship between sound pressure level of the flushing sound and sound quality is investigated by comparing with the bubble shape.
