What term denotes the relative amplitude of the signal compared to the amplitude of the noise?

What term denotes the relative amplitude of the signal compared to the amplitude of the noise?

• A. The relative amplitude of the signal compared to the amplitude of the noise
• B. The ratio of the electronic noise to the Radiofrequency noise
• C. The ratio of the largest to the smallest signal that the system can display
• D. The ratio of the transducer frequency to the received echo intensity

Answer: (A)

The main concept here is the signal-to-noise ratio, often abbreviated SNR. It is defined as the relative strength of the desired signal compared to the background noise, essentially how much larger the signal is than the noise. When the signal is much stronger than the noise, the SNR is high and the information is clear; when noise is close to or larger than the signal, the SNR is low and distinguishing the signal becomes difficult. SNR is typically expressed as a ratio (S/N) or in decibels, using either power or amplitude depending on the context. The description given—comparing the amplitude of the signal to the amplitude of the noise—matches this concept exactly. The other ideas described refer to different notions, such as dynamic range (largest to smallest detectable signal) or unrelated comparisons, and do not capture the idea of the signal’s strength relative to noise.

The main concept here is the signal-to-noise ratio, often abbreviated SNR. It is defined as the relative strength of the desired signal compared to the background noise, essentially how much larger the signal is than the noise. When the signal is much stronger than the noise, the SNR is high and the information is clear; when noise is close to or larger than the signal, the SNR is low and distinguishing the signal becomes difficult. SNR is typically expressed as a ratio (S/N) or in decibels, using either power or amplitude depending on the context. The description given—comparing the amplitude of the signal to the amplitude of the noise—matches this concept exactly. The other ideas described refer to different notions, such as dynamic range (largest to smallest detectable signal) or unrelated comparisons, and do not capture the idea of the signal’s strength relative to noise.