Tehospektrissä
Tehospektrissä is a Finnish term that translates to "power spectrum" in English. It refers to the distribution of the power of a signal or a process over its frequency components. In essence, it describes how much power is present at each specific frequency within a given signal. This concept is fundamental in various fields of science and engineering, including signal processing, physics, and econometrics.
The power spectrum is typically represented graphically, with frequency on the x-axis and power on the y-axis.
Mathematically, the power spectrum is often derived from the Fourier transform of a signal's autocorrelation function,