Pole-ZeroMapPole-ZeroMap(x(ooassxeN=1N=20.50.500-0.50.5X-1-1-0.500.50-1-1-0.50.5NAReal Axis (seconds-1)Real Axis (seconds)Pole-Zero MapPole-ZeroMap(sxXN=3N=40.50.5+0X0.50.5xX-170A00.5-10.50.5-0.51Real Axis (seconds1)Real Axis (seconds")Pole-ZeroMapPole-ZeroMapxoesN=5N=6X0.50.5000.50.5-1-1-10.500.5-1-0.500.511RealAxis (seconds-1)RealAxis (seconds-1)
给定指标，如何求N&2.？给定技术要求：在通带范围内允许的最大衰减为α，（dB)，截止频率为,在阻带范围内允许的最小衰减为α。dB)，临界频率为22N21101g10lg 1 +apαpH.(j) 1222N1IH.(j2)/210lg10lga.as02Ha(j2.) 2(1+e3)-1=/10°/10-1-a10%/1010%/10310.510%/1082=10~α,/10S20SIg10%/EN2gOpQQs2sIgleSp(S)12N2N1010E2210
• 在通带范围内允许的最大衰减为p(dB)，截止频率为Wp • 在阻带范围内允许的最小衰减为s(dB)，临界频率为Ws 2 2 2 2 /10 /10 /10 /10 1 10 lg 10 lg 1 | ( )| 1 10 lg 10 lg 1 | ( )| 10 1 10 1 10 1 lg 10 1 lg sp sp N p p p a p c N s s s a s c N s p s p H j H j N +ç ÷ +ç ÷ - ç ÷ - ç - ÷ - æ è 2 1 lg lg s p d - ç - ÷ = ( ) ( ) - - Î - - p N s N c p s 1 1 2 2 10 10 10 1 , 10 1 |Ha(j)| 2 1 = p - /10 10 1 - = s 2 /10 10 d