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diff --git a/Digital_Signal_Processing_by_S_Salivahanan/9-Realisation_of_Digital_Linear_Systems.ipynb b/Digital_Signal_Processing_by_S_Salivahanan/9-Realisation_of_Digital_Linear_Systems.ipynb
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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 9: Realisation of Digital Linear Systems"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 9.4: Cascade_Realisatio.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 9.4\n",
+"clc;clear;close;\n",
+"z=poly(0,'z');\n",
+"Hz=2*(z+2)/(z*(z-0.1)*(z+0.5)*(z+0.4));\n",
+"H=dscr(Hz);\n",
+"disp(Hz,'System Function H(z)=');\n",
+"disp(H,'System Function for cascade realisation Hk(z)=');"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 9.5_a: Parallel_Realisatio.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 9.5.a\n",
+"clc;clear;close;\n",
+"z=poly(0,'z');\n",
+"s=poly(0,'s');\n",
+"Hz=3*(2*z^2+5*z+4)/(2*z+1)/(z+2);\n",
+"H=pfss(Hz/z);\n",
+"for k=1:length(H)\n",
+"    H(k)=clean(H(k));\n",
+"    H1(k)=z*horner(H(k),z);\n",
+"end\n",
+"disp(Hz,'System Function H(z)=');\n",
+"disp(H1,'System Function for parallel realisation Hk(z)=');"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 9.5_b: Parallel_Realisatio.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 9.5.b\n",
+"clc;clear;close;\n",
+"z=poly(0,'z');\n",
+"s=poly(0,'s');\n",
+"Hz=3*z*(5*z-2)/(z+1/2)/(3*z-1);\n",
+"H=pfss(Hz/z);\n",
+"for k=1:length(H)\n",
+"    H(k)=clean(H(k));\n",
+"    H1(k)=z*horner(H(k),z);\n",
+"end\n",
+"disp(Hz,'System Function H(z)=');\n",
+"disp(H1,'System Function for parallel realisation Hk(z)=');"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}