From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books

---
 3161/CH4/EX4.2/Ex4_2.sce | 40 +++++++++++++++++++++++++++++++
 3161/CH4/EX4.4/Ex4_4.sce | 62 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 102 insertions(+)
 create mode 100644 3161/CH4/EX4.2/Ex4_2.sce
 create mode 100755 3161/CH4/EX4.4/Ex4_4.sce

(limited to '3161/CH4')

diff --git a/3161/CH4/EX4.2/Ex4_2.sce b/3161/CH4/EX4.2/Ex4_2.sce
new file mode 100644
index 000000000..b622f9277
--- /dev/null
+++ b/3161/CH4/EX4.2/Ex4_2.sce
@@ -0,0 +1,40 @@
+clc;
+//page 199
+//problem 4.2
+
+//Given angle modulated signal is x = 3*cos[2*pi*(10^6)*t+2*sin(2*pi*10^3*t)]
+
+//So, phase of the angle modulates signal is Q = 2*pi*(10^6*t)+2*sin(2*pi*(10^3)*t)
+
+//Instantaneous frequency = dQ/dt = 2*pi*(10^6)+ 4*pi*(10^3)*sin(2*pi*(10^3)*t)
+
+//For Instantaneous frequency at 0.25ms, Substituting t = 0.25ms in Instantaneous frequency
+//Instantaneous frequency is expressed as f1_rad for frequency in radians per second
+f1_rad = 2*%pi*(10^6)+ 4*%pi*(10^3)*sin(2*%pi*(10^3)*0.00025)
+
+//Instantaneous frequency is expressed as f1_hz for frequency in hertz
+f1_hz = f1_rad/(2*%pi)
+
+disp('the Instantaneous frequency at time t=0.25ms is '+string(f1_rad)+' rad/sec = '+string(f1_hz)+' Hz')
+
+//For Instantaneous frequency at 0.25ms, Substituting t = 0.5ms in Instantaneous frequency 
+//Instantaneous frequency is expressed as f2rad for frequency in radians per second
+f2_rad = 2*%pi*(10^6)+ 4*%pi*(10^3)*sin(2*%pi*(10^3)*0.0005)
+
+//Instantaneous frequency is expressed as f2hz for frequency in hertz
+f2_hz = f2_rad/(2*%pi)
+
+disp('the Instantaneous frequency at time t=0.5ms is '+string(f2_rad)+' rad/sec = '+string(f2_hz)+' Hz')
+
+//Maximum phase deviation = max[2*sin(2*pi*(10^3)*t)] = 2*1
+maxDp = 2;
+
+disp('Maximum phase deviation is '+string(maxDp)+' rad')
+
+//Maximum frequency deviation = max[4*pi*(10^3)*sin(2*pi*(10^3)*t)] = 4*pi*(10^3)*1
+maxDf = 4*%pi*(10^3)*1;
+
+disp('Maximum frequency deviation is '+string(maxDf)+' Hz')
+//disp('in rad',maxDf,'Maximum frequency deviation is')
+
+//In the textbook the calculated value of max frequency devaition is = 2000 Hz, in reality the value = 12566.371 Hz   
diff --git a/3161/CH4/EX4.4/Ex4_4.sce b/3161/CH4/EX4.4/Ex4_4.sce
new file mode 100755
index 000000000..c73555910
--- /dev/null
+++ b/3161/CH4/EX4.4/Ex4_4.sce
@@ -0,0 +1,62 @@
+clc;
+//page 208
+//problem 4.4
+
+//Given modulating signal m(t) = 2*sin(2*pi*(10^3)*t), B for phase modulation Bp = 10 & for fequency modulation Bf = 10
+Bp = 10
+Bf = 10
+
+//So Amplitude of modulating signal is Am=2 metres
+Am = 2
+
+//Frequency of modulating signal is fm = 1000 hertz
+fm=1000
+
+//Bandwidth = 2*(1+B)*fm
+
+//Bandwidth for phase modulation with modulating signal m(t) is bw_pm = 2*(1+Bp)*fm
+bw_pm = 2*(1+10)*1000
+
+//Bandwidth for frequency modulation with modulating signal m(t) is bw_fm = 2*(1+Bf)*fm
+bw_fm = 2*(1+10)*1000
+
+disp('Bandwidth for phase modulation '+string(bw_pm)+' Hz')
+disp('Bandwidth for frequency modulation '+string(bw_fm)+' Hz')
+
+//Bandwidth for phase & frequency modulation if frequency of modulating signal is doubled i.e fm = 2000 hertz
+
+//Bp & Bf after frequency of modulating signal is doubled
+
+//Bp = kp*Am, observing the equation as there is no change in amplitude Bp = 10
+Bp = 10
+
+//Bf = kf*Am/fm, observing the equation as there is change in frequency  Bf = 10/2 = 5
+Bf = 5
+
+//Bandwidth for phase modulation if frequency of modulating signal is doubled is bw_double_pm = 2*(1+Bp)*fm
+bw_double_pm = 2*(1+10)*2000
+
+//Bandwidth for frequency modulation if frequency of modulating signal is doubled is bw_double_fm = 2*(1+Bf)*fm
+bw_double_fm = 2*(1+5)*2000
+
+disp('Bandwidth for phase modulation for doubled frequency '+string(bw_double_pm)+' Hz')
+disp('bandwidth for frequency modulation for doubled frequency '+string(bw_double_fm)+' Hz')
+
+//Bandwidth for phase & frequency modulation if amplitude of modulating signal is halfed i.e Am = 1 metre
+
+//Bp & Bf after amplitude of modulating signal is halfed
+
+//Bp = kp*Am, observing the equation as there is change in amplitude Bp = 10/2 = 5
+Bp = 5
+
+//Bf = kf*Am/fm, observing the equation as there is change in amplitude Bf = 5/2 = 2.5
+Bf = 2.5
+
+//Bandwidth for phase modulation if frequency of modulating signal is doubled is bw_halfed_pm = 2*(1+Bp)*fm
+bw_halfed_pm = 2*(1+5)*2000
+
+//Bandwidth for frequency modulation if frequency of modulating signal is doubled is bw_halfed_fm = 2*(1+Bf)*fm
+bw_halfed_fm = 2*(1+2.5)*2000
+
+disp('Bandwidth for phase modulation for halfed amplitude '+string(bw_halfed_pm)+' Hz')
+disp('Bandwidth for frequency modulation for halfed amplitude '+string(bw_halfed_fm)+' Hz')
-- 
cgit