Finite impulse response filter design
6.1 Classification of digital filters
Digital filters are discrete-time systems. The type of digital filters that we shall design in this course is linear. Therefore, they possess all the properties of linear discrete-time systems discussed in Chapter 3. All linear discrete-time operations on an input sequence can be viewed as a filtering of the sequence to produce an output sequence. This is the reason why digital filters are so important in DSP.
Non-linear filters are also commonly used, especially in areas such as image processing. The median filter discussed in section 5.4 for image enhancement is a typical non-linear digital filter.
Linear systems are characterized by their impulse responses. An ...
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