The Design and Application of Digital Filters
D.R. Wilson, Davis R. Corrall, R. F. Mathias · IEEE Transactions on Industrial Electronics and Control Instrumentation · 1973
The advantages of digital circuits and the frequency-response design procedures that are available for specifying the coefficients of the digital-filter transfer function are discussed. The hardware design of a digital filter is discussed, and an example is given of the application of the filter in a servo loop. Further application of the filter to generate a notch network characteristic is illustrated.