Reference library > Processors: Filters > SVFilter

SVFilter

SVFilter(input=0.0, filter_type=SIGNALFLOW_FILTER_TYPE_LOW_PASS, cutoff=440, resonance=0.0)

State variable filter. filter_type can be 'low_pass', 'band_pass', 'high_pass', 'notch', 'peak', 'low_shelf', 'high_shelf'. resonance should be between [0..1].

Examples

#-------------------------------------------------------------------------------
# Using SVFilter as a low-pass filter on white noise.
#-------------------------------------------------------------------------------
noise = WhiteNoise()
filtered = SVFilter(input=noise,
                    filter_type="low_pass", 
                    cutoff=1000, 
                    resonance=0.6)
output = StereoPanner(filtered)
output.play()

#-------------------------------------------------------------------------------
# Using SVFilter as a low-pass filter to reduce the harshness of a square wave
# oscillator.
#-------------------------------------------------------------------------------
clock = Impulse(3.5)
Am7 = [ 67, 64, 60, 57 ] * 4
D7 = [ 62, 66, 69, 72] * 4
arpeggios = Am7 + D7
sequence = Sequence(arpeggios, clock)
frequency = MidiNoteToFrequency(sequence)

oscillator = SquareOscillator(frequency)
envelope = ASREnvelope(0.1, 0, 0.2, 1.0, clock)
voice = oscillator * envelope 
filtered = SVFilter(input=voice,
                    filter_type= "low_pass", 
                    cutoff=4000, 
                    resonance=0.3)
delayed = AllpassDelay(filtered, 0.15, 0.8, 0.5)

pan = TriangleLFO(0.1, -1.0, 1.0)
output = StereoPanner(delayed, pan) * 0.3
output.play()

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Last update: 2024-02-15
Created: 2023-12-03