This course reader, together with Mathematics of the Discrete Fourier Transform, is an evolving text for Music 320 at CCRMA, updated roughly annually. Copies can be ordered like any CCRMA publication. Ask for the latest edition of
Introduction to Digital Filters.Details of the August 2006 Edition:
The overall appearance of the book is essentially the same as that of Mathematics of the Discrete Fourier Transform, but in a green color scheme.