Abstract
Even when audio equipment, the sound quality of music playback is deteriorated by various factors. This study examines the deterioration in sound quality due to the type and state of power supply used in audio equipment. We consider that the power supply of the equipment influences the AC potential of the equipment, the propagation noise between parts of the equipment and the audio signal, in that order. Therefore, we measured the ground AC potential of audio equipment, the propagation noise on the ground line of the universal serial bus and the spectrum of the playback audio signal. Then, we analyzed the relationship between these signals. The results reveal a correlation between these signals, which confirms the proposed mechanism.
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