Power Spectral Density
AIM: To verify Power Spectral Density
EQUIPMENTS:
Operating System  Windows XP
Constructor  Simulator
Software  CCStudio 3 & MATLAB 7.5
PROGRAM:
%Power spectral density
t = 0:0.001:0.6;
x = sin(2*pi*50*t)+sin(2*pi*120*t);
y = x + 2*randn(size(t));
subplot(2,1,1);
% figure(1);
plot(1000*t(1:50),y(1:50))
title('Signal Corrupted with ZeroMean Random Noise')
xlabel('time (milliseconds)');
Y = fft(y,512);
%The power spectral density, a measurement of the energy at various frequencies, is:
Pyy = Y.* conj(Y) / 512;
f = 1000*(0:256)/512;
subplot(2,1,2);
% figure(2);
plot(f,Pyy(1:257))
title('Frequency content of y');
xlabel('frequency (Hz)');
OUTPUT:
RESULT: The power spectral density of given sequence is obtained. Hence the theory and practical value are proved.
Outcome: At the end of the experiment the students are able to find the power spectral density of given sequence is obtained.
VIVA QUESTION:
? What do you mean by phase spectrum and magnitude spectrum/ give comparison?
? How do you reduce spectral leakage?
? What do you mean by spectral resolution?

CreatedFeb 03, 2020

UpdatedFeb 03, 2020

Views514
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