A study on the time constant for an impulse sound level meter (A study on the loudness of impact sound. V)

Abstract

Some experiments on the loudness of impact sound were carried out, where the model impact sounds based on the actual ones were used as test stimuli. From these experiments, it is clarified that the reading of the sound pressure level through a circuit with a certain time constant can well describe the loudness of impact sounds than its sound energy does. The values of the time constant of exponential averaging circuit are investigated, accordingly. As the results of this study, a sound level meter with two exponential averaging circuits, one of which has 5 ms rise time constant and 250 ms decay time constant, and the other has 125 ms rise time constant and 250 ms decay time constant, shows a good agreement with loudness of a single or repeated impact sounds in the same way as in the loudness of steady sound. © 1984, Acoustical Society of Japan. All rights reserved.