抄録
This paper reports and discusses the results of a round robin test in Japan for the loudness of impact sound, which aims to establish how to evaluate the loudness, the noisiness and the annoyance of impact sounds and to describe them. As impact sounds which are encountered in daily life are characterized by high peak levels and short durations, the stimuli with such characteristics were prepared for the test: i.e. they had a short rising part (1 ms for 20 dB change), a steady part (0-100 ms) and a decaying part (30-300 ms). In this study the single burst of impact sound were presented diotically through headphones, and the method of constant stimuli was used. It is shown as the resultof the test that the sound energy level or the maximum output of an r.m.s. circuit with a time constant of 125 ms 1 s is suitable for the evaluation of stimuli. When eitherof these quantities is used, however, impact sounds are slightly louder (equivalent to 1-2 dB) than the burst of 200 ms long.
