ディジタルオーディオにおける深い感性に関連した音質劣化の原因究明--jitterに起因する音質劣化の仕組みの解明と新改善方法の検討 (特集感性ロボティクス)

概要

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For a smooth communication between human and robots, it is important to find out a development approach that can fully utilize the Deep KANSEI and keen sense of human. For this purpose, we have focused on the Deep KANSEI which evokes human deep emotions such as “atmospherics”, “feel of tension”and “texture of sound”, etc. In this paper, we investigate the relation between sound quality concerned with Deep KANSEI and jitter in digital audio systems. It is shown that the sound quality can be deteriorated by a small amount of jitter. When tracing the path of the jitter in the audio system for several jitter sources, we found that the jitter was suppressed by the PLL circuit, so that the jitter almost was not observed in the D/A converter block. Accordingly, we speculated that the influence of jitter was transformed to other shapes before or within the D/A converter block. One of the possibilities is that the influence of the jitter affects the sound quality, indirectly, via the power supply. We conducted a primary experiment to evaluate the sound quality when manipulating the power supply. The result was confirmed our speculation.
日本感性工学会の論文