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Articles tagged with #filter-design
Transfer Function The State Variable Filter (SVF) implements three simultaneous outputs — lowpass (LP), highpass (HP), and bandpass (BP) — from a single shared pole structure. All three biquads share
Every IIR lowpass filter we have covered — Butterworth, Chebyshev, Elliptic — achieves steep rolloff at the cost of nonlinear phase, meaning different frequency components are delayed by different amo
A 2nd-order Butterworth gives you 40 dB/decade. Double the order to fourth and you get 80 dB/decade — the same maximally flat passband, twice the stopband suppression. At fc = 1000 Hz with fs = 44100
Every sensor signal chain has a frequency-dependent noise floor. Below the shelf frequency the signal is clean; above it, quantization noise, switching harmonics, or electromagnetic interference domin
A pure integrator (pole at z = 1) delivers infinite DC gain and infinite wind-up risk. A low shelf biquad gives you the same low-frequency gain boost with a defined upper limit, no saturation algebra
Every filter you've used so far in this series attenuates some frequencies. The allpass filter does something different: it leaves the magnitude spectrum completely untouched — 0 dB gain at every freq
