Microprocessor Realization of a Digital Filter.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO
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A study is made concerning the theoretical aspects of digital filtering techniques and the realization of digital filters using a microprocessor to realize the digital transfer functions. Emphasis is on recursive digital filtering using the bilinear z-transformation. Background information is provided on data conversion and processing preceding the development of the z-transform and digital filter design by frequency domain techniques. Examples of second order digital filter realizations and block diagrams are presented. Included is a discussion of the sources of errors unique to digital techniques. An analog-to-digital and digital-to-analog converter was constructed to interface with the microprocessor. The microprocessor performed the necessary computations of the digital filter algorithm, thereby providing experimental verification of the theory. The results of this confirmation are illustrated.