Class: ColtraneSynth::Synth

Inherits:
Object
  • Object
show all
Defined in:
lib/coltrane/synth/synth.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(buffer, freq, nominal_rate) ⇒ Synth

Returns a new instance of Synth.



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# File 'lib/coltrane/synth/synth.rb', line 7

def initialize(buffer, freq, nominal_rate)
  @freq = freq.to_f
  @nominal_rate = nominal_rate

  i = -1
  wav = NArray.sint(1024)

  while i += 1
    1024.times do |j|
      wav[j] = (0.4 * Math.sin(phase(freq) * (i * 1024 + j)) * 0x7FFF).round
    end
    buffer << wav
  end
end

Instance Attribute Details

#freq ⇒ Object (readonly)

Returns the value of attribute freq.



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# File 'lib/coltrane/synth/synth.rb', line 5

def freq
  @freq
end

#nominal_rate ⇒ Object (readonly)

Returns the value of attribute nominal_rate.



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# File 'lib/coltrane/synth/synth.rb', line 5

def nominal_rate
  @nominal_rate
end

Instance Method Details

#phase(freq) ⇒ Object 



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# File 'lib/coltrane/synth/synth.rb', line 22

def phase(freq)
  Math::PI * 2.0 * freq / nominal_rate
end