Matlab Support for the Window Method

The Matlab Signal Processing Toolbox has two functions which implement the window method for FIR filter design:

• fir1 designs lowpass, highpass, bandpass, and multi-bandpass filters.
• fir2 takes an arbitrary magnitude frequency response specification.

The default window type is Hamming, but any window can be passed in as an argument. In addition, there is a function kaiserord for estimating the parameters of a Kaiser window which will achieve the desired filter specifications.