FIR filter design methods

Non-recursive digital filters have a finite impulse response (FIR) sequence, and they are inherently stable. Furthermore, a digital filter with a symmetrical impulse response has a linear phase characteristic, and therefore in this case there is no phase distortion imposed by the filter. In this chapter FIR filter design will be illustrated by considering the moving-averager filter, the frequency sampling method of design, and frequency-domain filter design using window functions.