Add Audio display to the Rich display example notebook

examples/notebooks/Part 5 - Rich Display System.ipynb

@@ -1,6 +1,6 b''
 {
  "metadata": {
-  "name": "Part 5 - Rich Display System"
+  "name": ""
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -500,6 +500,60 b''
      "level": 2,
      "metadata": {},
      "source": [
+      "Audio"
+     ]
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "IPython makes it easy to work with sounds interactively. The `Audio` display class allows you to create an audio control that is embedded in the Notebook. The interface is analogous to the interface of the `Image` display class. All audio formats supported by the browser can be used. Note that no single format is presently supported in all browsers."
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from IPython.display import Audio\n",
+      "Audio(url=\"http://www.nch.com.au/acm/8k16bitpcm.wav\")"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "A Numpy array can be auralized automatically. The Audio class normalizes and encodes the data and embed the result in the Notebook.\n",
+      "\n",
+      "For instance, when two sine waves with almost the same frequency are superimposed a phenomena known as [beats](https://en.wikipedia.org/wiki/Beat_%28acoustics%29) occur. This can be auralised as follows"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import numpy as np\n",
+      "max_time = 3\n",
+      "f1 = 220.0\n",
+      "f2 = 224.0\n",
+      "rate = 44100.0\n",
+      "L = 3\n",
+      "times = np.linspace(0,L,rate*L)\n",
+      "signal = np.sin(2*np.pi*f1*times) + np.sin(2*np.pi*f2*times)\n",
+      "\n",
+      "Audio(data=signal, rate=rate)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
       "Video"
      ]
     },
@@ -1237,4 +1291,4 b''
    "metadata": {}
   }
  ]
-}
+}

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