Acoustic Technology, Department of Electrical Engineering, Technical University of Denmark, DK-2800, Kongens Lyngby, Denmark.
J Acoust Soc Am. 2012 Sep;132(3):1427-35. doi: 10.1121/1.4740495.
This study is concerned with an objective measure called the slope ratio that can detect acoustic defects due to unexpected pressure increases such as strong reflections and coincidental constructive interference. The slope ratio is the ratio of the instantaneous slope to the mean slope in a decay curve. The slope ratio was suggested for determining the room acoustic transition time experimentally, but its threshold criteria have not been thoroughly investigated. The thresholds for the slope ratio, particularly for applications such as determining the room acoustic transition time and quantifying in situ diffuseness, are examined for various room impulse responses. For the tested rooms, a slope ratio threshold of 11 gives the most consistent and systematic results.
本研究关注一种称为斜率比的客观测量方法，它可以检测由于意外压力增加（如强反射和偶然的建设性干扰）引起的声学缺陷。斜率比是衰减曲线中瞬时斜率与平均斜率的比值。斜率比被建议用于实验确定房间声学混响时间，但它的阈值标准尚未得到彻底研究。斜率比的阈值，特别是用于确定房间声学混响时间和量化现场扩散度等应用的阈值，对于各种房间脉冲响应进行了检查。对于测试的房间，斜率比阈值为 11 可获得最一致和系统的结果。
