Class: AudioStream::Fx::Equalizer2band

Inherits:
Object
  • Object
show all
Defined in:
lib/audio_stream/fx/equalizer_2band.rb

Instance Method Summary collapse

Constructor Details

#initialize(soundinfo, lowfreq: 400.0, lowgain:, highfreq: 4000.0, highgain:) ⇒ Equalizer2band

Returns a new instance of Equalizer2band.

Parameters:

  • freq (Float) —

    Cutoff frequency

  • q (Float) —

    Quality factor

  • gain (AudioStream::Decibel) —

    Amplification level at cutoff frequency



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# File 'lib/audio_stream/fx/equalizer_2band.rb', line 7

def initialize(soundinfo, lowfreq: 400.0, lowgain:, highfreq: 4000.0, highgain:)
  @low_filter = LowShelfFilter.create(soundinfo, freq: lowfreq, q: BiquadFilter::DEFAULT_Q, gain: lowgain)
  @high_filter = HighShelfFilter.create(soundinfo, freq: highfreq, q: BiquadFilter::DEFAULT_Q, gain: highgain)
end

Instance Method Details

#plot(width = 500) ⇒ Object 



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# File 'lib/audio_stream/fx/equalizer_2band.rb', line 17

def plot(width=500)
  data1 = @low_filter.plot_data(width)
  data2 = @high_filter.plot_data(width)

  data = {
    x: data1[:x],
    magnitude: [data1[:magnitude], data2[:magnitude]].transpose.map {|a| a[0] + a[1]},
    phase: [data1[:phase], data2[:phase]].transpose.map {|a| a[0] + a[1]},
  }

  Plotly::Plot.new(
    data: [{x: data[:x], y: data[:magnitude], name: 'Magnitude', yaxis: 'y1'}, {x: data[:x], y: data[:phase], name: 'Phase', yaxis: 'y2'}],
    layout: {
      xaxis: {title: 'Frequency (Hz)', type: 'log'},
      yaxis: {side: 'left', title: 'Magnitude (dB)', showgrid: false},
      yaxis2: {side: 'right', title: 'Phase (deg)', showgrid: false, overlaying: 'y'}
    }
  )
end

#process(input) ⇒ Object 



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# File 'lib/audio_stream/fx/equalizer_2band.rb', line 12

def process(input)
  input = @low_filter.process(input)
  input = @high_filter.process(input)
end