高精度可变延时控制技术研究

Research on High Accuracy Variable Delay Control

高精度动态延时控制器在信道模拟系统中有着广泛的应用,对于普通结构的滤波器而言,无法实现任意值延时。Farrow结构滤波器可消除输出结果对滤波器系数的依赖性,使之只与延时量相关,满足高精度动态延时控制器的需求。日趋完善的高速存储技术,实现大规模整数点存储成为了可能,可提高每个采样点的精度。采用DDR+Farrow结构实现延时既可以提高延时精度,又便于实时控制。

High accuracy delay controller is widely used in channel simulation system. Classic structure of filters can＇t realize arbitrary delay. The result of Farrow structured fil-ters only has relationship with delay amount, which meets the requirement of the high accu-racy delay controller. In the meantime, increasingly improved high speed memory technology makes storing large number of integer samples possible by using DDR, which can improve the accuracy of every sample. DDR ＋ Farrow structure can make the delay amount more ac- curate and controllable as well.