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Question

The device used to carry digital data an analog lines is called as ___________.

A
Modem
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B
Multiplexer
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C
Modulator
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D
Demodulator
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E
None
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Solution

The correct option is C Modulator

The device used to carry digital data an analog lines is called as Modulator.

An analog-to-digital converter, or ADC as it is more commonly called, is a device that converts analog signals into digital signals. ... One example is a modem which turns signals from digital to analog before transmitting those signals over communication lines such as telephone lines that carry only analog signals.

A modulator is a device that performs modulation. A demodulator (sometimes detector or demod) is a device that performs demodulation, the inverse of modulation. A modem (from modulator–demodulator) can perform both operations.

This process of imposing an input signal onto a carrier wave is called modulation. ... This is called amplitude modulation or AM. Frequency of an input signal can also be changed. If this input signal is added to the pure carrier wave, it will thereby change the frequency of the carrier wave.


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