Journal
NOISE CONTROL ENGINEERING JOURNAL
Volume 56, Issue 6, Pages 414-424Publisher
INST NOISE CONTROL ENGINEERING
DOI: 10.3397/1.2987734
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- Seoul Metropolitan Government
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Just Noticeable Differences (JND) in sound quality metries-Zwicker's loudness, sharpness, roughness and fluctuations strength, and Auto-Correlation Function (ACF) parameters-were investigated using refrigerator sounds. An original refrigerator sound was set as a reference stimulus and the reference signal manipulated in terms of sound quality for use as a comparison stimulus. Forty participants were asked to evaluate the differences in sound quality of sound pairs, and the value of JND was determined using the criteria of 75% correct answers. The results showed that JNDs of loudness, sharpness, roughness, and fluctuation strength were 0.5 sone, 0.08 acum, 0.04 asper, and 0.012 vacil, respectively. JNDs of ACF parameters such as Phi(0), tau(1) and phi(1) were 2.0 dB9 0.4 ms, and 0.08 dB, respectively. The results of the present study provide criteria for sound quality enhancement of refrigerator sounds, especially the amount of value for perceptual improvements. (c) 2008 Institute of Noise Control Engineering.
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