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Lecture_13_BigPicture - Discrete Time Systems and Digital...

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Discrete Time Systems and Digital Signal Processing EE 341 Discrete Time Linear Systems Fall 2007 Howard Jay Chizeck University of Washington Seattle, Washington
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30 Oct 2007 2 Digital Signal Processing (DSP) DSP is the representation of a signal by a sequence of numbers (a "discrete time signal" or "digital signal"). This sequence of numbers can then be modified by a computing process to change or extract information from the original signal – this is digital signal processing. The "computing process" is a system that converts one digital signal into another— it is a "discrete time" system or "digital system "
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30 Oct 2007 3 Digital Signal Processing (DSP) Examples Extraction or reduction of noise. Removal of undesired frequencies Low pass filtering (removing high frequency "hiss" and "scratches" High Pass filtering (removing low frequency rumbling) Bandpass filtering—allowing only a range desired frequencies Shaping –emphasize some frequencies, and remove others
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Lecture_13_BigPicture - Discrete Time Systems and Digital...

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