class RemiAudio::DSP::BiQuadFilter

• RemiAudio::DSP::BiQuadFilter
• Reference
• Object

Overview

Implements a digital biquad filter.

Defined in:

remiaudio/dsp/biquadfilter.cr

Constant Summary

RESONANCE_MAX = 1.0

The maximum resonance value.

RESONANCE_MIN = Float64::MIN_POSITIVE

The minimum resonance value.

Constructors

• .new(newSampleRate)

  Creates a new BiQuadFilter.

Instance Method Summary

• #a1 : Float64
• #a2 : Float64
• #activate : Nil
• #active=(active : Bool)

  Whether or not the filter is currently active.

• #active? : Bool

  Whether or not the filter is currently active.

• #b0 : Float64
• #b1 : Float64
• #b2 : Float64
• #clearBuffer : Nil

  Clears the internal buffer

• #deactivate : Nil
• #freq : Float64
• #gain : Float64
• #mode : FilterMode
• #plot(pt : PlotType, *, coeffsOnly : Bool = false) : String

  Generates a string that can be passed to a program to plot this filter on a graph.

• #postGain : Float64

  The amount of gain to apply after the EQ, in decibels.

• #postGain=(value : Float64) : Nil

  The amount of gain to apply after the EQ, in decibels.

• #process(sample : Float64) : Float64

  Processes a single sample with the filter, returning a new sample.

• #process(sample : Float32) : Float32

  Processes a single sample with the filter, returning a new sample.

• #process(block : Array(Float64) | Slice(Float64)) : BiQuadFilter

  "Runs" the filter over block.

• #process(block : Array(Float32) | Slice(Float32)) : BiQuadFilter

  "Runs" the filter over block.

• #reset

  Clears the internal buffer.

• #sampleRate=(val : Int | Float) : Nil
• #setAllPass(centerFreq : Float64, bandwidth : Float64) : Nil

  Puts the filter into allpass mode, setting the center frequency and the resonance ("Q" value).

• #setBandPass(centerFreq : Float64, bandwidth : Float64) : Nil

  Puts the filter into bandpass mode, setting the center frequency and the width of the filter in octaves.

• #setHighPass(cutoff : Float64, resonance : Float64) : Nil

  Puts the filter into highpass mode, setting the cutoff frequency and the resonance ("Q" value).

• #setHighShelf(cutoff : Float64, gain : Float64, bandwidth : Float64) : Nil

  Puts the filter into low shelf mode, setting the cutoff frequency and the resonance ("Q" value).

• #setLowPass(cutoff : Float64, resonance : Float64) : Nil

  Puts the filter into lowpass mode, setting the cutoff frequency and the resonance ("Q" value).

• #setLowShelf(cutoff : Float64, gain : Float64, bandwidth : Float64) : Nil

  Puts the filter into low shelf mode, setting the cutoff frequency and the resonance ("Q" value).

• #setNotch(centerFreq : Float64, bandwidth : Float64) : Nil

  Puts the filter into notch (bandstop) mode, setting the center frequency and the resonance ("Q" value).

• #setPeakingEQ(centerFreq : Float64, gain : Float64, bandwidth : Float64) : Nil

  Puts the filter into peaking EQ mode, setting the center frequency and the resonance ("Q" value).

• #width : Float64

Constructor Detail

Instance Method Detail