This Demonstration shows the implementation of a design for an infinite impulse response (IIR) low-pass digital filter. The input consists of the design specifications for the desired Butterworh analog filter. These specifications are used to determine the Butterworth (analog) filter transfer function ... , which is then mapped to the digital filter transfer function ... . The transformation of ... to ... can be made using a bilinear transformation or impulse invariance. A number of plots are made available to examine different aspects of the final design result, such as the locations of the poles and zeros, the response of the filter to common test input signals, and the display of ... and ... in symbolic form. Due to space limitations, the design is limited to a filter of order 10. You can get the design by asking for a minimum order filter or by specifying the filter order required. Both normalized units and hertz units can be used in the frequency specification.


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