Abstract
Sound quality of music playback may be deteriorated due to various complex factors such as power supply state of the audio equipment. Therefore, in our previous study, we partly confirmed the mechanism that the power supply states affected alternative-current (AC)-potential difference and propagation noise between the equipment, which influenced audio-signal intermodulation distortion (IMD) on one of personal-computer (PC)-audio system. However, the research was insufficient in the number of measured audio equipment and measuring setup. In this study, we increased the model of digital-to-analog converter (DAC) and audio amplifier used for measurement and improved the measurement method to reduce the influence of measuring equipment. We measured ground AC potential, propagation noise, and the analog audio signal output of the amplifier. Their measurements were done in changing combination of audio equipment and each power supply states to analyze the relationship among these three domains. As a result, it is found that each domain depended on the model, combination, and power supply states of each audio equipment. There is a strong positive correlation between the ground AC potential and the propagation noise. There is also a positive correlation between the propagation noise and the audio-signal IMD in some combination of audio equipment.
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