1 files changed, 152 insertions, 0 deletions
diff --git a/Electronic_Communication_Systems_by_Roy_Blake/Chapter8.ipynb b/Electronic_Communication_Systems_by_Roy_Blake/Chapter8.ipynb
new file mode 100644
index 00000000..73a8384c
--- /dev/null
+++ b/Electronic_Communication_Systems_by_Roy_Blake/Chapter8.ipynb
@@ -0,0 +1,152 @@
+{
+ "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'"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.11"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}