アクティブ制御を用いたトイレ騒音低減システムの開発

抄録

In recent years, demand for a toilet noise reduction has been growing with an aging of population in japan. The purpose of this study is to develop the active noise control (ANC) system for a toilet noise. We proposed the toilet seat ANC system, in which the control sound is radiated to the inside of toilet bowl through the slit hole of the toilet seat. In this paper, the effectiveness of this proposal system is experimentally examined in the case of closing the lid of toilet. In the experiment, measurement of noise reduction characteristics and the sound visualization of toilet model using probe microphone were carried out. The results of this study shows that the noise-reduction effect was obtained maximum 49 dB at the error microphone and maximum 14 dB at the measurement microphone, in control for pure tone. From the result of visualization, noise-reduction effect was obtained in the local space of the error microphone position, however in external sound field, noise-reduction effect was hardly obtained depending on frequency due to the influence of transmission sound from the internal sound field.