Lecture III: Systems and their properties

Lecture III: Systems and their propertiesMaxim RaginskyBME 171: Signals and SystemsDuke UniversitySeptember 3, 2008 Maxim RaginskyLecture III: Systems and their propertiesThis lecturePlan for the Lecture :1 What is a system?2 System properties :causalitymemorylinearitytime invariance3 Linear time -invariant (LTI) systems4 Nonlinear systemsMaxim RaginskyLecture III: Systems and their propertiesWhat is a system?Recap:a system is any physical device, process or computer algorithmthat transforms input signals into output :electronic circuitsbiological Systems : audiovisual system, cardiovascular system, Systems : the stock market, social networks, processors in scientific or medical equipment or inaudio/video devicesWe will state our definitions for continuous- time syst

causal, since the output at time n depends in part on the input at future time n +1 Most physical systems are causal. However, noncausal systems are widely used in signal processing, for example, for smoothing of continuous-time and discrete-time signals for noise removal or quality enhancement. Maxim Raginsky Lecture III: Systems and their ...

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  Time, Discrete

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