Multiple choice

In MODEM, _____.

  1. several digital signals are multiplexed

  2. a digital signal changes some characteristic of a carrier wave

  3. digital signal is amplified

  4. all of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A MODEM (MOdulator-DEModulator) works by modulating a digital signal onto an analog carrier wave for transmission, then demodulating it back at the receiver. The digital signal modifies characteristics like amplitude, frequency, or phase of the carrier.

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