![]() ![]() ![]() Remarkably, the Filter Designer also allows the user to write mathematical scripts that compute the numerator and denominator coefficients of a desired filter's z-domain transfer function. I know of no other filter design software with that powerful capability. This means you can monitor the output of a designed filter (in both the time and frequency domains) in real-time as you manually manipulate the filter's frequency response 'markers' or z-plane poles or zeros. For example, you can design a lowpass IIR filter and then manually position a pair of conjugate zeros so that they reside at 60 Hz (or 50 Hz) to provide a deep frequency response notch in order to highly attenuate AC power-line spectral noise.Īs if the easy filter design capability weren't enough, the software designers also provide a way for the user to specify test signals that are applied to the input of the designed filter. The Filter Designer allows you to design specialized filters by way of manipulating the pole/zero locations using your computer's mouse. Once a high-order IIR filter is designed it can be converted to a cascade of 2nd-order biquad IIR sections to enable a stable filter implementation using fixed-point arithmetic. That will automatically change the frequency response curve and the z-plane pole/zero locations, as well as update the filter's coefficients. To change the filter's frequency-domain performance you merely use your computer's mouse to click on the little red squares ("Markers") and move them around in the frequency response plot. This article is available in PDF format for easy printing
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