英语词汇“frequency spectrum”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	frequency spectrum
释义	frequency spectrum frequency spectrum [′frē·kwən·sē ‚spek·trəm] (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/(2π T) 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. frequency spectrum fre·quen·cy spec·trum the range of frequencies in a signal, used to describe the resolving power of an imaging system in radiology. See FREQSPEC See FREQSPEC
随便看	lowest lowest acceptable daily dose lowest acceptable rate lowest acceptable revision lowest achievable emission rate lowest achievable emission reduction lowest adjacent grade lowest adjacent road crown lowest analytically quantifiable level lowest anticipated service temperature lowest astronomical tide lowest atmospheric layer lowest caste lowest charge level lowest common ancestor lowest common denominator lowest common denominator audience lowest common denominators lowest common factor lowest common multiple lowest common multiples lowest common multiplier lowest compilable unit lowest concentration minimum reporting level lowest cost, first out

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frequency spectrum