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# Lecture1 EMT - Signals and Systems Signals Waqas A Khan...

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Signals and Systems Signals and Systems Waqas A. Khan Waqas A. Khan Electrical Engineering Department Electrical Engineering Department COMSATS Institute of Information Technology COMSATS Institute of Information Technology Wah Campus Wah Campus

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Course Information Course Information Duration of the course 30 Lectures Textbook Signals & Systems Alan V. Oppenheim, Alan V. Willsky, S. Hamid Nawab Signals & Systems Simon Haykin, Barry Van Veen Grading Sessional 1 Examination 10% Sessional 2 Examination 15% Assignment & Quizzes 25% Final Examination 50%
Do All EE’s & CoE’s Design Do All EE’s & CoE’s Design Circuits? Circuits? NO!!!! Someone has to figure out what function those circuits need to do Someone also needs to figure out the “algorithms "needed (i.e., mathematical computer processing) Someone also needs to figure out what the whole system needs to d o

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Why Signals & Systems ? Why Signals & Systems ? Because most “systems” are driven by “signals” EEs& CoE’s study what is called “Signals & Systems”
What is a Signal? What is a Signal? A signal is defined as a function of one or more variables, which conveys information about the nature of a physical phenomenon. Information in a signal is contained in a pattern of variations of some form.

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What is a System? What is a System? A system is a transformation from one signal (called the input) to another signal (called the output or the response). The job of the “System” is often to extract, modify, transform, or manipulate that carried information So…a big part of “Signals & Systems ” is using math models to see what a system “does” to a signal
Some Application Areas Some Application Areas Application Area Specific Uses of Signals & Systems Telecommunications Answering machines, modems, fax machines, cell phones, speaker phones

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Lecture1 EMT - Signals and Systems Signals Waqas A Khan...

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