An introduction to z-space, the z-transform and digital filter design
Patrick A. Gaydecki · Institution of Engineering and Technology eBooks · 2004
In this chapter we have emphasised the overriding importance of the z-transform, poles and zeros and the z-transfer function in relation to the analysis, design and description of IIR filters. In contrast, although FIR filters may also be described using this technique, in practice we normally exploit other means to compute the coefficients of the impulse response. However, before we proceed to scrutinize in greater depth the general digital filter design problem, it would be enlightening if we first spent a little time studying how we actually sample the signals we wish to process.