Filters

Snapshot gallery for fundamental filter types in fundsp (impulse response SVG + 1s WAV audio).

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Contents

Input

All filter examples use following input:

sine_hz::<f32>(110.0)
    + sine_hz::<f32>(220.0)
    + sine_hz::<f32>(440.0)
    + sine_hz::<f32>(880.0)

filter_svf_lowpass_1k_q0_707

Lowpass 1 kHz Q≈0.707
Expression: lowpass_hz(1_000.0, 0.707)

filter_svf_highpass_1k_q0_707

Highpass 1 kHz Q≈0.707
Expression: highpass_hz(1_000.0, 0.707)

filter_svf_bandpass_1k_q1_0

Bandpass 1 kHz Q=1.0
Expression: bandpass_hz(1_000.0, 1.0)

filter_svf_notch_1k_q1_0

Notch 1 kHz Q=1.0
Expression: notch_hz(1_000.0, 1.0)

filter_peak_1k_q1_0

Peak 1 kHz Q=1.0
Expression: peak_hz(1_000.0, 1.0)

filter_bell_1k_q0_707_gain1_5

Bell 1 kHz Q≈0.707 gain≈+3.5 dB
Expression: bell_hz(1_000.0, 0.707, 1.5)

filter_lowshelf_500hz_q0_707_gain1_5

Low shelf 500 Hz Q≈0.707 gain 1.5
Expression: lowshelf_hz(500.0, 0.707, 1.5)

filter_highshelf_2k_q0_707_gain1_5

High shelf 2 kHz Q≈0.707 gain 1.5
Expression: highshelf_hz(2_000.0, 0.707, 1.5)

filter_moog_lowpass_1k_q0_5

Moog ladder lowpass 1 kHz Q=0.5
Expression: moog_hz(1_000.0, 0.5)

filter_lowrez_lowpass_1k_q1_0

Lowrez lowpass 1 kHz Q=1.0
Expression: lowrez_hz(1_000.0, 1.0)

filter_bandrez_bandpass_1k_q3_0

Bandrez bandpass 1 kHz Q=3.0
Expression: bandrez_hz(1_000.0, 3.0)

filter_lowpole_800hz

One-pole lowpass 800 Hz
Expression: lowpole_hz(800.0)

filter_highpole_300hz

One-pole highpass 300 Hz
Expression: highpole_hz(300.0)

filter_morph_lowpass_1k_q0_8

Morph lowpass 1 kHz Q=0.8 morph=-1.0
Expression: morph_hz(1_000.0, 0.8, -1.0)

filter_dcblock_10hz

DC blocker 10 Hz
Expression: dcblock_hz(10.0)

filter_allpass_1k_q0_707

Allpass 1 kHz Q≈0.707
Expression: allpass_hz(1_000.0, 0.707)

filter_butter_lowpass_1k

Butterworth lowpass 1 kHz (2nd order)
Expression: butterpass_hz(1_000.0)

filter_fir3_gain0_50_white

FIR3 Nyquist gain 0.50 (white noise input)
Expression: fir3(0.50)

filter_pinkpass_white

Pinking filter shaping white noise (≈3 dB/oct slope)
Expression: pinkpass::<f32>()

filter_follow_attack100ms

Amplitude follower (~100 ms) on modulated 220 Hz sine
Expression: sine_hz::<f32>(220.0) * (1.0 + 0.5 * sine_hz::<f32>(2.0)) >> follow(0.10)