
over the information band (0, v
0
). Furthermore, additive noise components above the cutoff
frequency will also be passed, since there is no sharp drop in attenuation at v
0
.
The ‘‘c2d’’ function in the MATLAB control system toolbox introduced in Section 4.10
supports sampling and ZOH signal reconstruction to find the z-domain transfer function given
in Equation 8.419. The syntax for calling the ‘‘c2d’’ function using ZOH approximation is
sysd ¼c2d(sysc,T,‘zoh’) where ‘‘sysc’’ is created using the control system toolbox
command ‘‘tf’’ to represent the continuous-time transfer function.
8.6.2 FIRST-ORDER HOLD SIGNAL RECONSTRUCTION
More accurate signal