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  {
   "cells": [
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "Chapter 15, Musical sound & acoustic of buildings"
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 1, page 518"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "from __future__ import division\n",
      "from math import log10\n",
      "# decibles\n",
      "#given data :\n",
      "i1=4 #assume\n",
      "i2=4*i1 #\n",
      "dl=10*log10(i2/i1) #db\n",
      "print \"Decibles by which intensity level will decrease = %0.2f db \" %dl"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Decibles by which intensity level will decrease = 6.02 db \n"
       ]
      }
     ],
     "prompt_number": 1
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 2, page 519"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import sympy\n",
      "# ratio of amlitudes\n",
      "#given data :\n",
      "l1=10 #db\n",
      "l2=40 #db\n",
      "dl=l2-l1 #db\n",
      "x=(10**(dl/10)) #\n",
      "x1=sympy.sqrt(x) #\n",
      "print \"Ratio of amplitudes =\", x1"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Ratio of amplitudes = 10*sqrt(10)\n"
       ]
      }
     ],
     "prompt_number": 1
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 3, page 521"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# frequency\n",
      "#given data :\n",
      "x=264 #key note\n",
      "g=x*(3.0/2) #\n",
      "print \"Frequency of note G = %0.f \" %g\n",
      "cd1=x*2 #\n",
      "print \"Frequency of note C = %0.f \"%cd1"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Frequency of note G = 396 \n",
        "Frequency of note C = 528 \n"
       ]
      }
     ],
     "prompt_number": 3
    }
   ],
   "metadata": {}
  }
 ]
}