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chap 2. signals and spectra: energy signal, power signal and spectrum

rain2u 2008. 7. 18. 10:39

energy spectrum density (ESD)
  • the ESD is defined for energy waveforms by

where
 (FT pairs).
 has units of joules per hertz.



power spectrum (power spectrum density, PSD)

(FYI) chap 2. signals and spectra: useful wave characteristic, wave의 power에 대해 정리한 내용 참고. 

  • the PSD for a deterministic power waveform is

where
 (FT paris).
and
 has units of watts per hertz.


  • Wiener-Khintchine theorm. PSD and autocorrelation function of certain physical waveform are Fourier transform pairs relation; that is