Although a given waveform may contain fr

练习题库2022-08-02 98

问题 Although a given waveform may contain frequencies over a very broad range， as a practical matter any transmission system will be able to accommodate only a limited band of（　　）.This， in turn，limits the data rate that can be carried on the transmission（　　）. A square wave has an infinite number of frequency components and hence an infinite（　　）.However， the peak amplitude of the kth frequency component， kf， is only 1/k， so most of the（　　）in this waveform is in the first few frequency components. In general， any digital waveform will have（　　）bandwidth. If we attempt to transmit this waveform as a signalover any medium， the transmission system will limit the bandwidth that can be transmitted.问题1选项A.frequenciesB.connectionsC.diagramsD.resources问题2选项A.proceduresB.functionC.routeD.medium问题3选项A.sourceB.bandwidthC.energyD.cost问题4选项A.frequencyB.energyC.amplitudeD.phase问题5选项A.smallB.limitedC.infiniteD.finite

选项

答案 ADBBC

解析虽然一个给定的波形包含了很宽的频率范围，但是任何实际的传输系统只能够通过有线的频带。这样，就限制了传输介质可以承载的数据速率。一个方波包含了无限多的频率成分，因而也具有无限的带宽。然而，第k个频率成分的峰值幅度kf知识1/k，所以波形的大部分能量知识包含在前面的少数频率成分中。一般来说，任何数字波形都有无线带宽。如果我们试图在某种介质上传输这种波形信号，则传输系统实际上会限制可以发送的带宽。

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本试题收录于：中级网络工程师题库软件水平考试初中高级分类

中级网络工程师

软件水平考试初中高级

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Although a given waveform may contain fr

中级网络工程师

软件水平考试初中高级