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Senin, 28 Oktober 2013

Periodogram Using Python Script

Periodogram Using Python Script - In the past, when I started to start blogging, many thoughts disturbed me. I want to have a blog with a nice and interesting look. I am constantly looking for basic tutorials from some web and blogs on the internet. And thankfully, one by one I started to do it, and of course have to go through some confusion process first, but the most important of a blog that is content, yes on the blog Innaz Review we will discuss a lot of information about gadgets that are very in need by you, now we will discuss first about Periodogram Using Python Script please refer to the information we will convey until completion:

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Periodogram Using Python Script

Periodogram
• Periodogram is the correct name for the
following process*:



• FFT stands for “Fast Fourier Transform”
• The FFT algorithm that can be used to
compute the
part.
• A periodogram is formed after taking the
average magnitude squared of the FFT.


Periodogram: Simple Example

1.n = integer
2.N = array of numbers from 0 to 2^n
3.x = exp(j*2*pi*f*N) + white noise
4.pg = abs(FFT)^2 / n
5.pgs = 10*log10(pg)
 

•Calculates spectrum from Real/Imag
axis, starting at 0 and rotating counter-
clockwise to 2pi (one full revolution)


LIBs NEEDED



Python
matplotlib.pyplot
scipy
numpy


we can plot the periodagram using python using the following script




****************************************************



from pylab import *
import matplotlib.pyplot as plt
n = 512
N = arange(0,n)
x = exp(2j*pi*0.1*N)+normal(0,0.01,n)
pg = abs(fft(x))**2/n
pgs = 10*log10(pg)
plt.plot(pgs)

 plt.show()



**********************************************




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