Discrete Time
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Discrete time is the Classification of discontinuities|discontinuity of a Function (mathematics)|function's time domain that results from Sampling (signal processing)|sampling a Variable (mathematics)|variable at a finite interval. For example, consider a newspaper that reports the price of crude oil once every day at 6:00AM. The newspaper is described as sampling the cost at a frequency of 24 hours, and each number that's published is called a sample. The price is not Well-definition|defined by the newspaper in between the times that the numbers were published. Suppose it is necessary to know the price of the oil at 12:00PM on one particular day in the past; one must base the estimate on any number of samples that were obtained on the days before and after the event. Such a process is known as interpolation. In general, the sampling Frequency|period in discrete-time systems is constant, but in some cases nonuniform sampling is also used. Discrete-time signals are typically written as...
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State Space    
Time Varying    
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