抄録
The loudness of impact sounds with wide-band spectrum was investigated, and compared with that of the impact sound with tonal character. The stimuli used in this experiment were synthesized by amplitude modulation of pink noise or white noise. As the results, the effectiveness of physical parameters on the loudness was found to be in the order of peak level, decay time and rise time, but the influence of rise time is smaller than that of difference among individual subjects. These tendencies are similar to the results of the experiment for impact sounds with tonal character. PSE for loudness of impact sounds with wide-band spectrum is influenced first of all by the peak sound pressure level and it does not always follow the energy principle. The mean sound pressure level observed through the circuit with time constant of 5ms and the one of 125ms, which was obtained from the experiment as to the impact sound with tonal character, was found to be a good measure for evaluating the loudness of impact sound with wide-band spectrum, too.
