Question

what are two reasons the digital signal is a more reliable way to copy sound recordings than the analog signal?
a. the digital signal is more complicated.
b. the digital signal includes a full range of values.
c. the digital signal is less affected by noise
d. the digital signal uses a limited number of values

Explanation:

• Option A: A more complicated signal is not necessarily more reliable. In fact, simplicity can sometimes lead to better reliability. So this option is incorrect.
• Option B: Analog signals include a full range of values. Digital signals use discrete values (e.g., binary - 0 and 1). So this option is incorrect.
• Option C: Digital signals are less affected by noise. Noise can distort the continuous values of an analog signal. But in digital signals, as long as the noise does not change a 0 to a 1 (or vice - versa) beyond recognition (and error - correction codes can help with that), the signal remains intact.
• Option D: Digital signals use a limited number of values (e.g., in binary, only two values). This makes it easier to regenerate the exact signal during copying. Analog signals, with their continuous range of values, are more prone to degradation during copying.

Answer:

C. The digital signal is less affected by noise; D. The digital signal uses a limited number of values.