Abstract
The characteristics of various types of refrigerator noise were investigated
in an anechoic chamber and in a real living environment – a 100 m2
apartment which is a common size in Korea. It was found that the
sound pressure level of the refrigerator noise in the real living
room was about 10 dB higher than the level in the anechoic chamber
at the same position (1 m in front of refrigerator). In addition,
a tolerance level for refrigerator noise was determined by subjective
evaluation experiments. Refrigerator noise was presented by a loudspeaker
placed in the kitchen where the refrigerator is normally located.
Level 2 responses to the subjective evaluation (“hardly perceivable”)
corresponded to a sound pressure level of about 26 dB(A), for which
90% of participants were satisfied with the level of refrigerator
noise. A semantic differential test using various adjectives was
also conducted to evaluate the sound quality of refrigerator noise.
With the semantic differential and the factor analysis, adjectives
used in this experiment were grouped into three factors. From the
results of correlation and multiple regression analyses on the psychoacoustical
parameters and subjective evaluations of 30 kinds of refrigerators,
sound quality index which predict the subjective rating score were
proposed.
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