The book gives the simplest possible equations for the design of IIR and FIR filters and examples for their use. This book was written to make digital filters more accessible to everyone. Practicing engineers will appreciate its straightforward approach and the simple formulas that readily lend themselves to real-time applications. Others will find that digital filter design and analysis is really not as difficult as they may have thought. The reader will find one for each IIR filter type (Butterworth, Linkwitz-Reilly, Bessel, Chebychev I & II, Variable Q, Allpass, Equalization, Notch and Shelf) equation for each coefficient. Plugin what you know – cutoff frequency, sample rate – and the equations will give you the coefficient values; no expensive software, transforms, or complicated manipulations are needed
