lib_test.coffee

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lib_test.coffee
¶
```
BROKEN_beep = () ->
```

http://stackoverflow.com/questions/14662131/generate-a-sound-of-specific-frequency https://github.com/stcode/javascript-array-to-audio

  freq = 440
  rate = 44100
  data = []
  for i in [0 .. 10000]
    time = i / rate
    data[i] = 128 + Math.round(127 * (Math.sin(2 * Math.PI * freq * time)))
  snd = new Audio(data)
  console.log "data", data
  console.log "snd",snd
  snd.play()

beep = () ->

¶

https://blog.stuartmemo.com/making-sine-square-sawtooth-and-triangle-waves/
```
  note(300, .2)
  note(150, .2)
  note(75, .2)
```

song [ [440, 1] [220, 1] [110, 1] ]


note = (freq, duration) ->
  if window.AudioContext?
    context = new AudioContext()
    oscillator = context.createOscillator()
    oscillator.connect(context.destination)
    oscillator.frequency.value = freq

oscillator.type = oscillator.SQUARE # TRIANGLE, SINE

    oscillator.start(context.currentTime)
    oscillator.stop(context.currentTime + duration)

BROKEN_song = (notes) ->
  return
  context = new webkitAudioContext()
  oscillator = context.createOscillator()
  oscillator.connect(context.destination)
  start_time = context.currentTime
  for note in notes
    oscillator.frequency.value = note[0]
    oscillator.start(start_time)
    next_time = start_time + note[1]
    oscillator.stop(next_time)
    start_time = next_time

(exports ? this).beep = beep