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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "<h1> Chpater 5: DIGTIAL BASEBAND TRANSMISSION<h1>"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 5.12, Page No 249 "
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Find The roll of factor alpha\n",
+      "\n",
+      "#initialisation of variables\n",
+      "datarate=0.1*10**6\n",
+      "fB=75000.0 #bandwidth\n",
+      "\n",
+      "#CALCULATIONS\n",
+      "Tb=1/datarate\n",
+      "alpha=2*fB*Tb-1\n",
+      "\n",
+      "#RESULTS\n",
+      "print('The roll out factor alpha =  = %.1f ' %alpha)\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The roll out factor alpha =  = 0.5 \n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 5.13, Page No 249"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#Find The Transmission bandwidth\n",
+      "\n",
+      "#initialisation of variables\n",
+      "q=128.0\n",
+      "alpha=0.2\n",
+      "n=math.log(q,2)\n",
+      "fm=2000.0\n",
+      "\n",
+      "#CALCULATIONS\n",
+      "Nq=2*fm\n",
+      "fs=1.25*Nq\n",
+      "N=8.0\n",
+      "total=N*fs\n",
+      "bitrate=7*total\n",
+      "fB=((1+alpha)*bitrate)/2\n",
+      "fB=fB/1000\n",
+      "#RESULTS\n",
+      "print('The minimum transmission Bandwidth required = %.f kHz' %fB)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The minimum transmission Bandwidth required = 168 kHz\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file