Frequency and Impulse Response of Linear Filters

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This Demonstration shows the relationship between the impulse response and the frequency response for ideal lowpass, bandpass, and highpass filters.

Contributed by: Vincent Tjeng (November 2015)
Open content licensed under CC BY-NC-SA



Snapshot 1: lowpass filter, with the cutoff frequency

Snapshot 2: highpass filter, with the cutoff frequency

Snapshot 3: bandpass filter, centered at frequency and with width

For the lowpass and highpass filters, you specify the cutoff frequency ; for the bandpass filter, you specify the frequency that the passband is centered about and the width of the passband . Changing for the lowpass or highpass filters has no effect on the system, so the slider is disabled in those cases.

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