ABSTRACT
The filter is a frequency-selective network design to operate on an input signal to produce a desired output signal. That is, a filter passes signals of certain frequencies and blocks signals of other frequencies. In this chapter, the authors discuss the first step because they need the analog form of filters to develop the corresponding digital ones. They provide fundamentals of two types of filters that will be used to develop digital ones. From a practical point of view, the implementation of the filter on a digital computer places accuracy constraints on the realization of the transfer function. The Chebyshev low-pass filter possesses a sharper cutoff response than the Butterworth filter, but it also possesses amplitude variations within the pass-band.
