Book

Digital filters of Infinite Impulse Response type, IIR, are known to be efficient but hard to design. This book will guide you to design a stable low pass filter with a high ratio between the sampling frequency and the cut off frequency.

The book is describing the transfer from analog to digital filter and a new method to make it possible to use integer mathematics and a new way to place the poles for a gaussian response. Pascal and C code are supplied.

It is 51 pages in A5 and delivered with post.

The examples are written for 23 bit data plus sign bit input, a 32 * 32 = 64 bit multiplier and 32 and 64 bit registers.