{
 "metadata": {
  "name": "",
  "signature": "sha256:b47d42851a95b239c1a54b9b998eec602c81d678d0f92705fab117d580600a10"
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 "nbformat": 3,
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 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "Chapter 18: Information Theory, Coding And Data Communication"
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 18.1, page no. 591"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "\n",
      "# Variable Declaration\n",
      "SNR_dB = 32.00                     # Signal to Noise ratio (dB)\n",
      "f1     = 300.00                    # Lower Limit of Voice Frequency (Hz)\n",
      "f2     = 3400.0                    # Upper Limit of Voice Frequency (Hz)\n",
      "\n",
      "# Calculation\n",
      "import math                        # Math Library\n",
      "SNR    = pow(10,SNR_dB/10)         # Signal to Noise Ratio\n",
      "C      = (f2-f1)*math.log(1+SNR,2) # Capacity of Telephone Channel (bps)\n",
      "\n",
      "# Result\n",
      "print \"The capacity of a standard 4 kHz telephone channel with 32 dB SNR is C =\",round(C,1),\"bits per second.\""
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "The capacity of a standard 4 kHz telephone channel with 32 dB SNR is C = 32956.3 bits per second.\n"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 18.2, page no. 591"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "\n",
      "# Variable Declaration\n",
      "SNR_dB = 28.00         \t          # Signal to Noise ratio (dB)\n",
      "BW1    = 4.00*pow(10,3)           # System Bandwidth 1 (Hz)\n",
      "BW2    = 8.00*pow(10,3)           # System Bandwidth 2 (Hz)\n",
      "\n",
      "# Calculation\n",
      "import math                       # Math Library\n",
      "SNR1   = pow(10,SNR_dB/10)        # Signal to Noise Ratio 1\n",
      "C1     = BW1*math.log(1+SNR1,2)   # Information Carrying Capacity (bps)\n",
      "SNR2   = pow(10,SNR_dB/10)/2      # Signal to Noise Ratio 2\n",
      "C2     = BW2*math.log(1+SNR2,2)   # Information Carrying Capacity (bps)\n",
      "\n",
      "# Result\n",
      "print \"(a) The information carrying capacity of a standard 4 kHz telephone channel with 28 dB SNR is C1 =\",round(C1),\"bits per second.\"\n",
      "print \"(b) The information carrying capacity of a standard 8 kHz telephone channel with same signal power as in (a) is C2 =\",round(C2),\"bits per second.\"\n",
      "print \"    Also the ratio of the two quantities,   C2/C1 =\",round(C2/C1,3)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "(a) The information carrying capacity of a standard 4 kHz telephone channel with 28 dB SNR is C1 = 37215.0 bits per second.\n",
        "(b) The information carrying capacity of a standard 8 kHz telephone channel with same signal power as in (a) is C2 = 66448.0 bits per second.\n",
        "    Also the ratio of the two quantities,   C2/C1 = 1.786\n"
       ]
      }
     ],
     "prompt_number": 5
    }
   ],
   "metadata": {}
  }
 ]
}