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提出了一种利用均方导数的均方差度量混响起伏的方法,该方法将混响的起伏和发射信号的时宽带宽联系起来,而传统的采用起伏率描述混响起伏的方法只考虑混响统计模型一二阶矩.理论分析表明,对于窄带信号和宽带信号,其混响包络的起伏和发射信号的时宽带宽存在确定的比例关系,对线性调频信号的仿真和试验结果验证了该方法的正确性,通过和传统起伏率的对比,表明了该方法能够更好地反映混响包络起伏特性.
A method to measure the reverberation fluctuation using the mean square difference of the mean square derivative is proposed. The method connects the undulation of the reverberation with the time-bandwidth of the transmitted signal. However, the traditional method of describing the reverberation using the fluctuation rate only considers the mixed The first and second order moments of the statistical model are analyzed.Theoretical analysis shows that there is a certain proportional relationship between the undulation of the reverberant envelope and the time bandwidth of the transmitted signal for the narrowband signal and the wideband signal.The simulation and experimental results on the chirp signal verify The correctness of the method, compared with the traditional rate of ups and downs, shows that the method can better reflect the characteristics of the reverberation envelope fluctuations.