Which concept describes the relationship between useful audio signal and unwanted noise?

• A. Signal-to-noise ratio
• B. Dynamic range
• C. Frame rate
• D. Color depth

Answer: (A)

The signal-to-noise ratio describes how strong the useful audio is compared with the unwanted noise. It tells you how much the desired signal stands out from the background hiss, hum, or static. A higher ratio means the audio sounds clearer because the noise is relatively small compared to the signal; a lower ratio means the noise intrudes more and the sound quality degrades. This is typically measured in decibels, giving a quantitative sense of how much louder the signal is than the noise floor.

Other concepts don’t capture this relationship. Dynamic range, for instance, refers to the span between the quietest and loudest parts a system can reproduce, not how loud the signal is relative to noise. Frame rate and color depth relate to video, not the balance between a desired audio signal and noise.