class AudioStream::Fx::Phaser

Public Class Methods

new(soundinfo, rate:, depth:, freq:, dry: -6.0, wet: -6.0) click to toggle source

@param soundinfo [AudioStream::SoundInfo] @param rate [AudioStream::Rate] modulation speed @param depth [Float] frequency modulation depth @param freq [Float] Base cutoff frequency @param dry [AudioStream::Decibel] dry gain @param wet [AudioStream::Decibel] wet gain

# File lib/audio_stream/fx/phaser.rb, line 11
def initialize(soundinfo, rate:, depth:, freq:, dry: -6.0, wet: -6.0)
  @soundinfo = soundinfo

  @filters = [
    AllPassFilter.new(soundinfo),
    AllPassFilter.new(soundinfo),
  ]

  @speed = rate.frame_phase(soundinfo)
  @phase = 0

  @depth = depth
  @freq = freq

  @dry = Decibel.create(dry).mag
  @wet = Decibel.create(wet).mag
end

Public Instance Methods

process(input) click to toggle source
# File lib/audio_stream/fx/phaser.rb, line 29
def process(input)
  window_size = input.window_size
  @phase = (@phase + @speed) % (2.0 * Math::PI)

  a = Math.sin(@phase) * 0.5 + 0.5
  apf_freq = @freq * (1.0 + a * @depth)

  wet = input
  @filters.each {|filter|
    filter.update_coef(freq: apf_freq, q: BiquadFilter::DEFAULT_Q)
    wet = filter.process(wet)
  }

  streams = wet.streams.map.with_index {|wet_stream, i|
    dry_stream = input.streams[i]
    dry_stream * @dry + wet_stream * @wet
  }

  Buffer.new(*streams)
end