class RemiAudio::DSP::ParaEQ

• RemiAudio::DSP::ParaEQ
• Reference
• Object

Overview

A mono parametric EQ.

The first band is always a low shelf, and the last band is always a high shelf. The others are all normal peaking bands.

Defined in:

remiaudio/dsp/paraeq.cr

Constant Summary

DEFAULT_HIGH_SHELF_FREQ = 15000.0

The default cutoff frequency for the high shelf, in Hertz.

DEFAULT_HIGH_SHELF_WIDTH = 0.7071067811865475

The default bandwidth for the high shelf, in octaves.

DEFAULT_LOW_SHELF_FREQ = 80.0

The default cutoff frequency for low shelf, in Hertz.

DEFAULT_LOW_SHELF_WIDTH = 0.7071067811865475

The default bandwidth for band 0, in octaves.

DEFAULT_PEAKING_FREQ = 500.0

The default cutoff frequency for the peaking bands, in Hertz.

DEFAULT_PEAKING_Q = 1.0

The default bandwidth for the peaking bands, as a Q value.

Constructors

• .new(numBands, newSampleRate)

  Creates a new parametric EQ.

Instance Method Summary

• #active=(active : Bool)

  When true, this equalizer will process audio, otherwise it will pass any audio through unmodified.

• #active? : Bool

  When true, this equalizer will process audio, otherwise it will pass any audio through unmodified.

• #plot(pt : PlotType) : String

  Generates a string that can be passed to a program to plot this equalizer 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 of audio with the equalizer, returning a processed sample.

• #process(sample : Float32) : Float32

  Processes a single sample of audio with the equalizer, returning a processed sample.

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

  Processes a block of audio with the equalizer.

• #reset : Nil

  Resets all bands in the equalizer.

• #sampleRate : Float64

  The sample rate of the equalizer.

• #setBand(band : Int, freq : Float64, gain : Float64, width : Float64) : Nil

  Sets the frequency/band/width for the given band.

Constructor Detail

Instance Method Detail