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【简答题】
什么是电压降落、电压损耗、电压偏移、电压调整?
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反馈参考答案：
举一反三
【单选题】Choose the phrase that is closest in meaning to the underlined part. By applying a digital compression algorithm, resulting in a digitally compressed representation of the original signal, the amount ...
A.
to precisely represent the origin of the PCM samples
B.
to reconstruct the signal initially represented by PCM accurately
C.
to accurately regenerate the original pulses of the modulated samples
D.
to resample the pulse code modulation codes correctly
【判断题】Modulation is the name of the process of converting from digital to analog.
A.
正确
B.
错误
【单选题】Analog modulation with an optical fiber communication system is()efficient, requiring a far( )signal to noise ratio at the receiver than digital modulation.
A.
less higher
B.
more higher
C.
more lower
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