Enhancements

Dated material has been removed.
More emphasis is placed on practical methodologies and many of the more theoretical aspects of the subject have been removed.
More emphasis is placed on the use of MATLAB for the analysis, design, and implementation of digital filters.
The material has been reorganized to provide a more natural flow of the underlying principles, techniques, design methods, and algorithms.
A new state-of-the-art method for the design of nonrecursive digital filters that would satisfy prescribed specifications using ultraspherical window functions.
A new state-of-the-art method for the design of recursive equalized digital filters that would satisfy prescribed specifications using constrained optimizations.
New comparative studies on the design of nonrecursive and recursive digital filters have been included that have not been published in the open literature before.