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本文从研究RC梯形网络的特性入手走出了一条模拟延时的新途径:首先分析了单个重极点系统的时域和频域特性,然后以多个重极点系统来代替它,找出了其中的等效关系。这种多个重极点系统可用若干组相同的RC梯形网络加上相应数量的隔离放大器实现,是e~(-τs)的一种低通逼近模型。本低通模型具有优良的时域特性,其延迟时间可达千秒级,T_d/T_r值达3以上。用它与经过预矫正(predistortion)之后的二阶全通Pade逼近模型相结合,能使ω_(-3db)和T_d/T_r值均得到提高,且其前振峰值低于3%:越调与回降量均低于1%。理论计算与实验结果十分接近。
In this paper, a new way to simulate the delay is established by studying the characteristics of RC ladder network. Firstly, the time and frequency domain characteristics of single pole system are analyzed. Then, Equivalent relationship. The multiple systems of multiple poles can be realized by using several identical RC ladder networks with a corresponding number of isolation amplifiers, which is a low-pass approximation of e ~ (-τs). The low-pass model has excellent time-domain characteristics, the delay time of up to a thousand seconds, T_d / T_r value of 3 or more. Using it in combination with the second-order all-pass Pade approximation after predistortion, the values of ω_ (3db) and T_d / T_r are all improved and the peak value of the frontal vibration is less than 3% Drop-off volume is less than 1%. Theoretical calculation and experimental results are very close.