Sound quality improvement on industrial products

Even with efforts to reduce the noise level (dB) of industrial products, some people remain dissatisfied with the sound of products due to annoyances remained. Annoyance is closely related to the sound quality (SQ), especially in quiet environments such as hospitals and laboratories, it is essential to improve the sound quality (comfort of listening) of products. We defined a method for evaluating the sound quality of industrial products that we handle using both existing and developed sound quality indices that focus on the high-pitched sound, the prominent peak noise, the rough sound and the beat/moan noise, and improved our actual products based on the method. In this paper, we introduce the evaluation method and the sound quality improvement in actual products, including one of research activities that contributes to the business unit and has the potential to create future customer value.