Practice Quiz

MTEL Technology and Engineering

Category - Tech and Engineering

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Which of the following is typically a digital signal?
  1. The output from a microphone.
  2. The input to a sound amplifier.
  3. The output from a computer's speaker.
  4. Communication between computers.
Explanation
Correct Response: D. Computers typically send and receive data in the form of a digital signal. In some cases, a modem may convert a computer's outgoing signal to analog, but the signal will have to be converted back to a digital signal before it can be received by another computer. The output from a microphone (A) is analog, not digital. The input to an amplifier (B) from many devices is an analog signal. The output from any speaker (C) is a sound wave. Sound waves are analog by definition.
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