信号处理方法对室内声学参量计算结果的影响

Effect of signal processing methods on room acoustical parameter esimation

在室内声学参量的测量中,不同的信号处理方法将会使计算结果产生偏差。在数字化测量的基础上,根据ISO3382的测量标准,针对混响时间以及其它声学参量,比较了在信号处理过程中不同的滤波器、信号初始时间的判断方法以及噪声修正方法对声学参量的计算结果的影响程度。结果表明,不同的数据处理方法在低频段、信噪比较小以及混响时间较短的情况下对声学参量的影响较大;与一般的噪声修正法相比,当信号信噪比不足时,对中后期的脉冲响应进行非线性拟合的方法更具优势。

In measuring parameters of room acoustics, different signal processing methods will lead to different results. Based on the international standard ISO3382 and using digital measurements, acoustical parameters including reverberation times (T20, T30) and other quantities such as EDT, Ts, and D50 are used to study and compare the influences of different filters, initial time judgment and noise correction methods on the obtained results. It is concluded that at low frequencies there is more deviation if signal-to-noise ratio is low or the reverberation time is short. Compared to ordinary noise correction methods, non-linear fitting with a middle and later impulse response function is more advantageous when SNR is relatively low.