www.cmp.caltech.edu/~mcc/Chaos_Course/Lesson6/Power.pdf
[PDF]Power Spectrum Analysis of Heart Rate Fluctuation: A ...
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University of Texas at Austin
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by S Akselrod - 1981 - Cited by 4441 - Related articles
Feb 28, 2006 - High-frequency peak. '“m r. Power- spectrum of HR fluctuations. Fig. l. (a) Power spectrum of heart rate fluctuations in the adult conscious dog.
Chapter 6
Power Spectrum
The power spectrum answers the question “Howmuch of the signal is at a frequency
!?”. 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
sidebands); 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, if infinitely long sequences of continuous data are available to
process. In practice there are always limitations of restricted data length and
sampling frequency, and it is important to investigate how these limitations affect
the appearance of the power spectrum.
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