The System with Zero Order
نویسنده
چکیده
Causal and Noncausal discrete{time transfer functions for some discrete{time system with zero order hold (ZOH), rst order hold (FOH) or ideal sampler are distinguished and described. In the case of ZOH or FOH the discussed notions are essential for the system with a continuous time plant described by the rational proper transfer function with the order of numerator equal to that of the denominator, while in the case of ideal sam-pler for the plant with the order of numerator less by one from that of the denominator. It is noticed that in the case of ZOH and FOH the causal discrete{time transfer functions have an additional causal mode which increases by one the order of the model. It is shown that for description of the closed{loop systems usually the causal transfer functions are used, however in some cases the part of the system can be described by the noncausal transfer functions.
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