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词汇 Spectral density function
分类 英语词汇 英语翻译词典
释义

Spectral density function

英语百科

Spectral density

The spectral density of a fluorescent light as a function of optical wavelength shows peaks at atomic transitions, indicated by the numbered arrows.
Spectrogram of an FM radio signal with frequency on the horizontal axis and time increasing upwards on the vertical axis.

The power spectrum S_{xx}(f) of a time series x(t) describes the distribution of power into frequency components composing that signal. According to Fourier analysis any physical signal can be decomposed into a number of discrete frequencies, or a spectrum of frequencies over a continuous range. The statistical average of a certain signal or sort of signal (including noise) as analyzed in terms of its frequency content, is called its spectrum.

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