The characters of phase shift and group delay are controlled by the number and position of zeroes and poles.
而滤波器的零点、极点个数及其位置又完全决定了其相移和群延迟的性质。
Anoiher signal with 90 degree delay is obtained by phase shift circuit. The accurate and stable circle counting is done by a reversible counter.
通过移相电路获得相差90度的另一路信号，然后用可逆计数器实现稳定准确的周期计数。
The modal control is analysed in cases of all modal controlled and limited modal controlled respectively. The time delay is compensated using method of phase shift.
模态控制分控制全部模态和控制有限模态两种情况，时滞补偿采用移相补偿。
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