某一模拟滤波器系统函数的极点位于 s 平面左半平面,采用脉冲响应不变法映射为数字滤波器,则所得数字滤波器系统函数的极点位于 z 平面 _____ 。
A.
单位圆内
B.
单位圆上
C.
单位圆外
D.
虚轴上
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