MATLAB® and Its Applications in Engineering: [Based on MATLAB 7.5 (R2007b)]

15.10. Digital Filter Design

The process of deriving a realizable transfer function of a digital filter by considering given frequency response specifications is known as digital filter design. The digital filters can be classified as:

• Finite-duration impulse response (FIR) filter

• Infinite-duration impulse response (IIR) filter

In MATLAB, there are built-in functions which can be used to design digital filters like IIR and FIR.

15.10.1. IIR Digital Filter Design

The different types of IIR digital filters are:

• Butterworth filter

• Chebyshev Type I filter

• Chebyshev Type II filter

• Elliptic filter

Before designing a filter, it is necessary to obtain the order of the filter. The syntax of different MATLAB functions used to obtain the order of a filter ...