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Change the link for the word "degree" in the first sentence. It should direct to "degree of a polynomial" but was directing to degree (angle). |
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In [[control theory]], a '''proper transfer function''' is a [[transfer function]] in which the [[Degree of a polynomial|degree]] of the numerator does not exceed the degree of the denominator. A '''strictly proper''' transfer function is a transfer function where the degree of the numerator is [[less than]] the degree of the denominator.
The difference between the degree of the denominator (number of poles) and degree of the numerator (number of zeros) is the ''relative degree'' of the transfer function.
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because
:<math> \deg(\textbf{N}(s)) = 4 \nleq \deg(\textbf{D}(s)) = 3 </math>.
A '''not proper''' transfer function can be made proper by using the method of long division.
The following transfer function is '''strictly proper'''
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==References==
* [https://web.archive.org/web/20160304220240/https://courses.engr.illinois.edu/ece486/documents/set5.pdf Transfer functions] - ECE 486: Control Systems Spring 2015, University of Illinois
* [http://www.ece.mcmaster.ca/~ibruce/courses/EE4CL4_lecture9.pdf ELEC ENG 4CL4: Control System Design Notes for Lecture #9], 2004, Dr. Ian C. Bruce, McMaster University
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