[单选题]

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 （71） . This, in turn, limits the data rate that can be carried on the transmission （72） . Asquare wave has an infinite number of frequency components and hence an infinite （73） . However, the peak amplitude of the kth frequency component, kf, is only 1/k, so most of the （74） in this waveform. is in the first few frequency components. In general, any digital waveform. will have （75） bandwidth. If we attempt to transmit this waveform. as a signal over any medium, the transmission system will limit the bandwidth that can be transmitted.

（71）A. frequencies B. connections C. diagrams D. resources

（72）A. procedure B. function C. route D. medium

（73）A. source B. bandwidth C. energy D. cost

（74）A. frequency B. energy C. amplitude D. phase

（75）A. small B. limited C. infinite D. finite

（71）

A． frequencies

B． connections

C． diagrams

D． resources

（72）

A． procedure

B． function

C． route

D． medium

（73）

A． source

B． bandwidth

C． energy

D． cost

（74）

A． frequency

B． energy

C． amplitude

D． phase

（75）

A． small

B． limited

C． infinite

D． finite

参考答案与解析：

相关试题

Although a given waveform. may contain f

[单选题]A．lthough 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 (71) ．This，in turn，limits the data rate that can be carried on the transmissi

  • 查看答案

    • The rim of the piston may contain cut-ou

    [单选题]The rim of the piston may contain cut-out portions to accommodate （） when they open.A . the gasesB . the airC . the valvesD . the injector

  • 查看答案

    • This website may contain links to other websites _____ privacy practices may be different from ours.

    This website may contain links to other websites _____ privacy practices may be

  • 查看答案

    • She got married although her parents had not given her their( )

    [单选题]She got married although her parents had not given her their( )A.possession

  • 查看答案

    • Although some countries have taken action to solve the shortage of water, it may be some time _

    [单选题]Although some countries have taken action to solve the shortage of water, i

  • 查看答案

    • Although Rapp's practices may sound extreme，he is part of a growing movement，consisting largely

    Although Rapps practices may sound extreme，he is part of a growing movement，cons

  • 查看答案

    • You may follow the ideas given.-|||-Think of an important aspect in your life,such as your career,fa

    You may follow the ideas given.-|||-Think of an important aspect in your life,su

  • 查看答案

    • You are required to select one word for given in a word bank following me passage. You may not use a

    You are required to select one word for given in a word bank following me passag

  • 查看答案

    • Select one word for each blank from a list of choices given in the word bank. You may not use any of

    Select one word for each blank from a list of choices given in the word bank. Yo

  • 查看答案

    • Select one word for each blank from a list of choices given in the word bank. You may not use any of

    Select one word for each blank from a list of choices given in the word bank. Yo

  • 查看答案