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一 清晰度(在一小时內,研究声譜和人噪音声譜的比較值)是評价客車舒适的标准。滿意的清晰度为40％,如清晰度在60％以上时,則为良好。表1列出国外客車的测量結果。
A sharpness (a comparison of sonar sound spectrum and sonar noise within an hour) is the standard for evaluating passenger comfort. Satisfactory resolution of 40%, such as clarity of 60% or more, then good. Table 1 lists the measurement results of foreign passenger cars.