“frequency spectrum”的概念、定义、翻译、参考文献-科学参考

单词	frequency spectrum
释义	frequency spectrum [`frē·kwǝn·sē ´spek·trǝm] ^PHYSICS A plot of the distribution of the intensity of some type of electromagnetic or acoustic radiation as a function of frequency. ^{SYSTEMS ENGINEERING} In the analysis of a random function of time, such as the amplitude of noise in a system, the limit as T approaches infinity of 1/(2T ) times the ensemble average of the squared magnitude of the amplitude of the Fourier transform of the function from -T to T. Also known as power-density spectrum; power spectrum; spectral density.
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