Class: Synthesizer::ShapePos

Inherits:
Object
  • Object
show all
Defined in:
lib/synthesizer/shape_pos.rb

Constant Summary collapse

SEMITONE_RATIO = 
2.0 ** (1.0 / 12.0)

Instance Method Summary collapse

Constructor Details

#initialize(samplerate, init_phase) ⇒ ShapePos

Returns a new instance of ShapePos.



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# File 'lib/synthesizer/shape_pos.rb', line 5

def initialize(samplerate, init_phase)
  @samplerate = samplerate.to_f

  init_phase = init_phase ? init_phase.to_f : Random.rand(1.0)
  @sync_phase = init_phase
  @shape_phase = init_phase
end

Instance Method Details

#next(hz, sym, sync) ⇒ Object 



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# File 'lib/synthesizer/shape_pos.rb', line 13

def next(hz, sym, sync)
  if sync<0.0
    sync = 0.0
  end

  if 1.0<=@sync_phase
    @sync_phase %= 1.0
    @shape_phase = @sync_phase
  end

  sync_hz = hz
  sync_delta = sync_hz / @samplerate
  @sync_phase += sync_delta

  shape_hz = hz * (SEMITONE_RATIO ** sync)
  shape_delta = shape_hz / @samplerate
  @shape_phase += shape_delta
end