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This applet demonstrates the the use of the MathXplorer/JS server in an engineering design tool. Given some filter specifications, the applet designs an optimal FIR filter using the Remez algorithm.
The desired frequency response of the filter is specified in disjoint frequency bands. Each band consists of four values: two frequencies at the endpoints of the band and corresponding response magnitudes. The filter order is the dimension of the designed FIR filter. Increasing the filter order improves the match between the desired and actual frequency responses.
In the following applet, the table to the left is used to specify desired frequency-magnitude response pairs. Up to four frequency bands may be specified. The yellow text box serves as a prompt where commands may be entered to define, modify, or inspect variables. The text box below the prompt is used to specify the filter order. After the Design button is clicked, the applet computes and plots the new design from the specifications. The plot consists of the both the desired (yellow) and computed (red) frequency responses.