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<{p}>The main components of the signal can always be extracted using a filter with a sufficiently steep response and a high enough cut-off frequency, <{u}>as long as the spectral components beyond the cut-off frequency are negligible.<{/u}><{/p}>

发布于 2021-04-13 16:27:38

【单选题】
A provided the cut-off frequency of the spectral contents is to be neglected
B provided the signal’s frequency contents above the cut-off frequency can be neglected
C so long as the signal spectrum is above the negligible level at the cut-off frequency
D as long as the spectral density is too small to be greater than the cut-off frequency

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VV8 2023-04-13

把气愤的心境转化为柔和，把柔和的心境转化为爱，如此，这个世间将更加完美。

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