Ex.7.1 Determine Specifications for a Discrete- Time Filter H(ei). given: Specifications of the continuous-time filter: ◆1.passband1-0.01<He(/2kl+0.01,for02≤2π(2000) ◆2.stopband m(2<0.001,for2π(3000)≤2 f®-47 CID H(ej) DIC xa(t) x(n] y[n] T=104s 2=27=2x00000) T For bandlimited input,aliasing avoided when sampling frequency is high enough 1212 ◆Specifications of the continuous-time filter: ◆1. passband ◆2. stopband 1 0.01 1 0. −    + H j for eff( ) 01, 0 2 20  ( 00) H j for eff(  ) 0.001, 2 3000 ( ) 4 T s 10− = ( ) 2 S 2 10000 T   = =  ( ) ( )  , , 0, j T eff H e H T j T       =   For bandlimited input, aliasing avoided when sampling frequency is high enough Ex. 7.1 Determine Specifications for a Discrete￾Time Filter H(e j) . given: If 可作为