Construction of Sound Quality Evaluation System under Consideration of Auditory Sense

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The sound quality evaluation system is investigated under consideration of human auditory sense by loudness. The mechanical sounds collected from some kinds of machine are processed from the stand point of A-frequency weighting network, band level, and loudness. Each processed and reduced sound is compared by hearing investigators. The sound evaluation by using Zwicker's loudness is done by summing the 26 band levels. It was found that the sound processed by A-frequency weighting network is effective to sound in the range of low frequency, and the sound processed by loudness is effective to the higher frequency.