User:Mirza92/Sandbox

The power spectrum is a representation of the magnitude of the various frequency components of a signal. By looking at the spectrum, one can find how much energy or power is contained in the frequency components of the signal. Power spectrum simply answers the question “How much power is contained in the frequency components of the signal?”

Frequency spectrum of a time-domain signal, is a representation of that signal in the frequency domain.

We have seen that periodic signals give peaks at a fundamental and its Harmonics; quasiperiodic signals give peaks at linear combinations of two or more Irrationally related frequencies (often giving the appearance of a main sequence and Side-bands); and chaotic dynamics give broad band components to the spectrum. Indeed this later may be used as a criterion for identifying the dynamics as chaotic. Examples are shown in demonstration 1. These are all statements about the ideal Power spectrum,

REFERENCES: 1.	Frequency spectrum, Wikipedia.org 2.	Introduction to Biosignal Detection. By Wenxi Chen Biomedical Information Technology Lab, the University of Aizu. 3.	Numerical Recipes by W.H. Press, B.P. Flannery, S.A. Teukolsky, and W.T.Vetterling, (Cambridge University Press, 2nd Edition). 4.	Tikrit Journal of Engineering Sciences/Vol.19/No.2/June 2012, (36-07) By Soad T. Abed, Zena. E. Dallalbashi, Faten. A. Taha.