Design of Digital Filters
The design techniques of digital filters are discussed in detail. At first, emphasis is laid on the conceptual organization and analytical methods of design. Then the chapter concludes with the details of how to use MATLAB® as a computer-aided design tool. Numerous examples are given throughout the chapter of both analytical and computer-aided design methods.
5.2 General Considerations
As in the case of analog filters studied in Chapter 3, the design of digital filters in the frequency domain can be accomplished according to the following procedure:
The transfer function of a general IIR filters is of the form
and the special case of an FIR filter transfer function is obtained by putting BN(z−1) = 1 so that an FIR digital transfer function is a polynomial of the form
The frequency response of the filter is ...