単発衝撃音のラウドネス : 国内ラウンドロビンテストの結果から(I)

概要

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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 (1ms for 20dB change), a steady part (0〜100ms) and a decaying part (30〜300ms). 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 result of the test that the sound energy level or the maximum output of an r. m. s. circuit with a time constant of 125ms〜1s is suitable for the evaluation of stimuli. When either of these quantities is used, however, impact sounds are slightly louder (equivalent to 1〜2dB) than the burst of 200 ms long.