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Digital data can also be represented by (71) signals by use of a modem.The modem converts a seriesof binary voltage (72) into
Digital data can also be represented by (71) signals by use of a modem.The modem converts a seriesof binary voltage (72) into
admin
2019-05-15
31
问题
Digital data can also be represented by
(71)
signals by use of a modem.The modem converts a seriesof binary voltage
(72)
into an analog signal by encoding the digital data onto a carrier frequency.The resuming signal occupies a certain spectrum of
(73)
centered about the carrier and may be propagated across a medium suitable for that carrier.The most common modems represent digital data in the voice
(74)
and hence allow those data tO be propagated over ordinary voice-grade
(75)
lines.At the other end of the line,another modem demodulates the signal to recover the original data.
(72)
选项
A、signals
B、waves
C、pulses
D、data
答案
C
解析
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本试题收录于:
网络管理员上午基础知识考试题库软考初级分类
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