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INTRODUCTION TO DIGITAL FILTERS - University of California, …

1 INTRODUCTION TO DIGITAL FILTERSA nalog and DIGITAL filtersIn signal processing, the function of a filter is to remove unwanted parts of the signal, such as random noise, orto extract useful parts of the signal, such as the components lying within a certain frequency following block diagram illustrates the basic are two main kinds of filter, analog and DIGITAL . They are quite different in their physical makeup and inhow they analog filter uses analog electronic circuits made up from components such as resistors, capacitors and opamps to produce the required filtering effect. Such filter circuits are widely used in such applications as noisereduction, video signal enhancement, graphic equalisers in hi-fi systems, and many other are well-established standard techniques for designing an analog filter circuit for a given all stages, the signal being filtered is an electrical voltage or current which is the direct analogue of thephysical quantity ( a sound or video signal or transducer output) DIGITAL filter uses a DIGITAL processor to perform numerical calculations on sampled values of the signal.

An analog filter can only be changed by redesigning the filter circuit. 2. Digital filters are easily designed, tested and implemented on a general-purpose computer or workstation. 3. The characteristics of analog filter circuits (particularly those containing active components) are subject to drift and are dependent on temperature.

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