Question
Which of the following describes a signal in the time domain?
Answer Options
- A) Power at intervals of phase
- B) Amplitude at different times
- C) Frequency at different times
- D) Discrete impulses in time order
Correct Answer: B
Explanation
In radio engineering and signal analysis, a signal can be represented in one of two fundamental domains: the time domain or the frequency domain. The domain dictates what electrical quantity is displayed against which independent variable. The time domain is the most familiar representation, often seen on an oscilloscope.
A signal in the time domain describes its characteristics relative to time. Specifically, it describes the amplitude at different times. A graph in the time domain plots the instantaneous voltage (amplitude) of the signal vertically against the passage of time horizontally, showing the signal’s waveform shape and phase relative to itself.
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