부산대학교 도서관

A human hears a sound and recognizes the pitch by its frequency. However, sometimes a human recognizes a sound as different frequency from actual frequency. The frequency that human feels is called "hearing frequency". On the other hand, impact sound is defined as the sound that occurs when a collision happened. We often hear an impact sound, but its "hearing frequency" has not been studied. In this study, "hearing frequency" of impact sound is investigated by experiment. First, an experiment using sample sound is taken place. This sample sound is short term waves which has some period waves. Next experiment is carried out using an imitation impact sound. Imitation impact sound is sinusoidal wave that have damping behavior in order to detect the influence of damping. Then, an experiment with various impact sounds that were recorded as the actual sound is proceeded. After that, an experiment with actual impact sound that has center frequency is carried out, in order to detect the influence of the center frequency. Results of these experiments show that the high frequency sound tends to be recognized as lower frequency than actual frequency. And low frequency sound tends to be recognized as higher frequency than actual frequency.