Acoustics Research Group, Department of Physics and Astronomy, Brigham Young University, N283 Eyring Science Center, Provo, Utah 84602, USA.
J Acoust Soc Am. 2011 Oct;130(4):EL244-50. doi: 10.1121/1.3635298.
Assessment of desirable reflections and control of undesirable reflections in rooms are best accomplished if the reflecting surfaces are properly localized. Several measurement techniques exist to identify the incident direction of reflected sound, including the useful polar energy time curve (Polar ETC), which requires six cardioid impulse response measurements along the Cartesian axes. The purpose of this investigation is to quantify the incidence angle estimation error introduced into the Polar ETC by non-cardioid microphone directivities. The results demonstrate that errors may be minimized with a cardioid-family microphone possessing a certain range of directivities and by maximizing the measurement signal-to-noise ratio.
如果能正确定位反射面，那么对房间中理想反射和控制不良反射的评估将最为有效。有几种测量技术可用于确定反射声的入射方向，包括有用的极能时曲线（Polar ETC），它需要沿笛卡尔轴进行六次心型脉冲响应测量。本研究的目的是量化非心型传声器指向性引入 Polar ETC 的入射角估计误差。结果表明，通过使用具有一定指向性范围的心型传声器家族并最大化测量信号噪声比，可以将误差最小化。
