equal loudness contours 等响曲线 ; 标准的等响度曲线

cequal loudness contours 等响曲线

loudness contours equivalent 等响线

loudness contours detail 响度曲线

Normal equal-loudness contours 测声原理

Normal equal-loudness-level contours 标准等响度级曲线 ; 标准等响曲线

equal loudness level contours 等响度级曲线