equivalent loudness level 等效响度级
habitual loudness level 习惯响度级
Normal equal-loudness-level contours 标准等响度级曲线 ; 标准等响曲线
loudness level indicator 响度级指示计
uncomfortable loudness level 不舒适声级
comfortable loudness level 舒适响度级
equal loudness level contours 等响度级曲线
equal loudness level 叫做等响级
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