The window method of FIR design is simple to understand and perform. It can be done with pen and paper for many filters and simple windows. In this lesson you will learn the steps to perform window-based design and the factors governing window selection. You will also learn how to use MATLAB to perform window-based filter design through several examples. At one time the window method was the most popular method for FIR filter design. However, the principles behind the window method are broadly applicable in signal processing. Learning this method will reinforce several important signal-processing concepts.