module RemiAudio::DSP::LPFilter

Direct including types

• RemiAudio::DSP::BiquadLP
• RemiAudio::DSP::CemFilter
• RemiAudio::DSP::HornetFilter
• RemiAudio::DSP::MS20Filter
• RemiAudio::DSP::SsmFilter

Defined in:

remiaudio/dsp/lpfilter.cr

Constant Summary

CUTOFF_MAX = 22000.0

The maximum cutoff frequency.

CUTOFF_MIN = 40.0

The minimum cutoff frequency.

ENABLE_AT = CUTOFF_MAX - 1.0

If the cutoff is set above this, the filter is automatically disabled.

This is above human hearing limits.

RESONANCE_MAX = 1.0

The maximum resonance amount.

RESONANCE_MIN = 0.0

The mininum resonance amount.

Class Method Summary

• .midiToCutoff(val : UInt8) : Float64

  Converts a MIDI value (0-127) to a cutoff frequency in hertz.

Instance Method Summary

• #active=(active : Bool)
• #active? : Bool
• #cutoff : Float64

  The current cutoff of the filter.

• #cutoff=(val : Float64)
• #invSampleRate : Float64
• #process(sample : Float32) : Float32
• #process(sample : Float64) : Float64
• #reset : Nil
• #resonance : Float64

  The current resonance of the filter as a Q value.

• #resonance=(val : Float64)
• #sampleRate : Float64
• #sampleRate=(val : Int | Float) : Nil
• #set(newCutoff : Float64, newResonance : Float64)
• #updateCoefficients : Nil

Class Method Detail

Instance Method Detail