Update chapter 11

Author: rossant

chapter11_image/02_filters.ipynb

@@ -14,6 +14,7 @@
    "outputs": [],
    "source": [
     "from io import BytesIO\n",
+    "import tempfile\n",
     "import requests\n",
     "import numpy as np\n",
     "import scipy.signal as sg\n",
@@ -32,9 +33,10 @@
     "def speak(data):\n",
     "    # We convert the mp3 bytes to wav.\n",
     "    audio = pydub.AudioSegment.from_mp3(BytesIO(data))\n",
-    "    wave = audio.export('_', format='wav')\n",
-    "    wave.seek(0)\n",
-    "    wave = wave.read()\n",
+    "    with tempfile.TemporaryFile() as fn:\n",
+    "        wavef = audio.export(fn, format='wav')\n",
+    "        wavef.seek(0)\n",
+    "        wave = wavef.read()\n",
     "    # We get the raw data by removing the 24 first bytes\n",
     "    # of the header.\n",
     "    x = np.frombuffer(wave, np.int16)[24:] / 2.**15\n",

chapter11_image/06_speech.ipynb

@@ -114,8 +114,10 @@
     "        # in a dedicated Output widget.\n",
     "        with widgets.Output():\n",
     "            synth(f)\n",
+    "\n",
     "    button.on_click(partial(on_button_clicked, f))\n",
     "    buttons.append(button)\n",
+    "\n",
     "# We place all buttons horizontally.\n",
     "widgets.Box(children=buttons)"
    ]