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http://AllSignalProcessing.com for more great signal processing content, including concept/screenshot files, quizzes, MATLAB and data files. Limitations of analog anti-aliasing and anti-imaging filters motivate a practical digital filtering approach in which high rates are used for sampling and reconstruction. To avoid excessive computational or storage cost associated with high rates, the sampling rate is changed by downsampling the discrete-time signal prior to processing/storage and then upsampling the signal prior to conversion back to continuous time.
