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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Chapter 8 : The Telephone System"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 3 : pg 323"
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The net loss is 0.8 dB\n"
]
}
],
"source": [
" \n",
"# page no 323\n",
"# prob no 8.3\n",
"#calculate the net loss\n",
"#A telephone signal takes 3 ms to reach its destination\n",
"#given\n",
"t=2.;\n",
"#calculations\n",
"#Determination of net loss VNL reqd for acceptable amount of echo.\n",
"VNL=(0.2*t)+0.4;\n",
"#results\n",
"print 'The net loss is',VNL,'dB'"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 5 : pg 326"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The value of carrier freq for channel 5 is 92.0 kHz\n"
]
}
],
"source": [
" \n",
"# page no 326\n",
"# prob no 8.5\n",
"#calculate the carrier freq value\n",
"#given\n",
"#Refering the fig.8.15 channel 12 has lowest carrierr freq 64 kHz\n",
"F=64.;\n",
"c_total=12.;\n",
"#Carrier freq goes up 4kHz per channel\n",
"f_up=4;\n",
"#Determination of carrier freq for channel 5\n",
"c=5;\n",
"#calculations\n",
"fc=F+(f_up*(c_total-c));\n",
"#results\n",
"print 'The value of carrier freq for channel 5 is',fc,'kHz'"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Example 6 : pg 328"
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The tone appear in the supergroup output at frequency of 426.0 kHz\n"
]
}
],
"source": [
" \n",
"#page no 328\n",
"#prob no 8.6\n",
"#calculate the tone \n",
"# 2kHz tone is present on channel 5 of group 3 of a supergroup\n",
"# refer to example 8.5, calculated fc=92kHz\n",
"#given\n",
"fc=92.;#in kHz\n",
"#calculations\n",
"# Here signal is lower sideband,the 2kHz baseband signal therefore will be\n",
"fg=fc-2;\n",
"#from fig 10.15,group 3 in the supergroup is moved to the range 408-456 kHz, with a suppressed carrier frequency of 516kHz.\n",
"fsc=516;# in kHz\n",
"#the modulation is lower sideband,so the supergroup o/p freq will be 90kHz lower than carrier freq\n",
"fsg=fsc-fg;\n",
"#results\n",
"print 'The tone appear in the supergroup output at frequency of',fsg,'kHz'"
]
}
],
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