Question

Which statements describe a digital signal? Check all that apply.

The signal is made of numbers.
The signal degrades over time.
The signal is continuous.
The signal is not continuous.
The signal picks up noise.

Answer 1

Correct choices:
- The signal is made of numbers. — True. A digital signal represents information with discrete values (usually numbers or bits).
- The signal is not continuous. — True. Digital signals are discrete in value (and often in time), not continuous like analog signals.
- The signal picks up noise. — True. Digital signals can pick up noise and suffer bit errors, though they are often more robust and can be regenerated to remove accumulated noise.

Incorrect choices:
- The signal degrades over time. — Generally false as a defining property. Digital signals can be corrupted by noise or attenuation, but they can be restored by regeneration and error correction, so they do not necessarily "degrade over time" in the continuous way analog signals do.
- The signal is continuous. — False; that describes analog signals.