The system uses a single-chip microcomputer as the control core and combines the basic principle of a dual second-order loop filter to enable it to simultaneously have the functions of low-pass, high-pass, band-pass, and band-stop filters. The DAC is equivalent to a variable resistor to achieve program control of the filter parameters. The system can set the type of filter, cutoff frequency, and Q value through the keyboard. The cutoff frequency of the low-pass and high-pass filters and the center frequency of the band-pass and band-stop filters can be preset in the range of 100 Hz to 50 kHz, and the Q value range is 0.5 to 5. The system uses a matrix keyboard and LCD display, and the human-computer interaction interface is friendly.
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