The characters of phaseshift 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。
2
Anoiher signal with 90 degree delay is obtained by phaseshift 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。
3
The modal control is analysed in cases of all modal controlled and limited modal controlled respectively. The time delay is compensated using method of phaseshift.