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{
"metadata": {
"name": "",
"signature": "sha256:91b0cb714976b5e3abb5fa418cb1d12fb7cd307f6d4fd008a74f2dcf67b41e57"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 5 Fundamentals of frequency modulation"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 5.1 Page no 153"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Given\n",
"f = 915*10**6\n",
"fm_deviation =12.5*10**3\n",
"\n",
"#Calculation\n",
"max_deviation = f + fm_deviation\n",
"min_deviation = f - fm_deviation\n",
"\n",
"#Result\n",
"print\"Maximum frequency occur during modulation is \",max_deviation/1000.0,\"KHz\"\n",
"print\"Minimum frequency occur during modulation is \",min_deviation/1000.0,\"KHz\"\n",
"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Maximum frequency occur during modulation is 915012.5 KHz\n",
"Minimum frequency occur during modulation is 914987.5 KHz\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 5.2 Page no 160"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Given\n",
"max_deviation = 25*10**3\n",
"fm =15.0*10**3\n",
"\n",
"#Calculation\n",
"mf =max_deviation/fm\n",
"\n",
"#Result\n",
"print\"The deviation ratio of the TV sound is \",round(mf,3)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The deviation ratio of the TV sound is 1.667\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 5.3 Page no 162"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Given\n",
"mf = 2.2\n",
"fd = 7.48*10**3\n",
"\n",
"#Calculation\n",
"fm = fd/mf\n",
"\n",
"#Result\n",
"print\"The maximum modulating frequency is \",fm/1000.0,\"KHz\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The maximum modulating frequency is 3.4 KHz\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 5.4 Page no 164"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Given\n",
"J0 = -0.4\n",
"J1 = -0.07\n",
"J2 = 0.36\n",
"J3 = 0.43\n",
"J4 = 0.28\n",
"\n",
"#Result\n",
"print\"The amplitude of the carrier is \",J0\n",
"print\"Amplitudes of the first four sidebands are \",\" \\n \", J1,\"\\n \",J2,\"\\n \",J3,\"\\n \",J4\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The amplitude of the carrier is -0.4\n",
"Amplitudes of the first four sidebands are \n",
" -0.07 \n",
" 0.36 \n",
" 0.43 \n",
" 0.28\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 5.5 Page no 165"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Given\n",
"fd = 30*10**3\n",
"fm = 5*10**3\n",
"N=9\n",
"\n",
"#Calculation\n",
"bw1 = 2*fm*N\n",
"bw2 = 2*(fd+fm)\n",
"\n",
"#Result\n",
"print\"The maximum bandwidth of the fm signal is \",bw1/10**3,\"KHz\"\n",
"print\"Bandwidth using carson's rule \",bw2/10**3,\"KHz\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The maximum bandwidth of the fm signal is 90 KHz\n",
"Bandwidth using carson's rule 70 KHz\n"
]
}
],
"prompt_number": 13
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 5.6 Page no 167"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Given\n",
"S_N = 2.8\n",
"fm = 1.5*10**3\n",
"fd =4*10**3\n",
"\n",
"#Calculation\n",
"import math\n",
"fi= math.asin(1/S_N)\n",
"delta = fi*fm\n",
"SN =fd/delta\n",
"\n",
"#Result\n",
"print\"(a) The frequency deviation caused by the noise \",round(delta,1),\"Hz\"\n",
"print\"(b) The improved output signal to noise ratio is \",round(SN,1)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"(a) The frequency deviation caused by the noise 547.8 Hz\n",
"(b) The improved output signal to noise ratio is 7.3\n"
]
}
],
"prompt_number": 21
}
],
"metadata": {}
}
]
}
|
