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The Scientist and Engineer's
Guide to Digital Signal Processing
by Steven W. Smith
California Technical Publishing
ISBN 0-9660176-3-3 (1997)
Chapter 17. Custom Filters
- Arbitrary Frequency Response
- Deconvolution
Most filters have one of the four standard frequency responses: low-pass, high-pass,
band-pass or band-reject. This chapter presents a general method of designing digital
filters with an arbitrary frequency response, tailored to the needs of your
particular application. DSP excels in this area, solving problems that are far above the
capabilities of analog electronics. Two important uses of custom filters are discussed in
this chapter: deconvolution, a way of restoring signals that have undergone an
unwanted convolution, and optimal filtering, the problem of separating signals
with overlapping frequency spectra. This is DSP at its best.
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