混响曲线的转折与清晰度评价

Effective Decay Curves and Articulation Formula

传统混响时间T60公式是理想化的统计结果。因此在计算、测试与音质的主观质量之间往往存在误差。从厅堂的脉冲响应入手,结合人耳对脉冲密度的感知限值,对前期声场中不满足统计原则的时段按几何声学处理,后期声场中声线达到充分扩散按统计声学处理。从而得到两段式的混响曲线。并以此方法对经典清晰度公式提出改进。使结果与实际声场更为接近。对厅堂音质设计具有一定的指导意义。

The traditional reverberation formula T60 is a statistical result obtained in an ideal acoustical environment. So the errors often occur in calculation, test and subjective assessment of acoustics. In this paper, using echogram and frequency threshold perceptibility, the actual sound field is analyzed, disintegrating the reverberation into two parts. The first part is treated with geometrical acoustics and another one with statistics. Finally, using this theory, the articulation formula has been improved. This method can be used in acoustic design of multi-purpose halls.