What term is used to reduce the display of weak echo signals arising from electronic noise?

What term is used to reduce the display of weak echo signals arising from electronic noise?

• A. Threshold
• B. Gain
• C. Dynamic Range
• D. Frame Rate

Answer: (A)

The concept here is suppressing weak, noisy signals by setting a cutoff level. A threshold filters out anything below a certain amplitude, so faint echoes caused by electronic noise aren’t displayed. This makes the image cleaner and improves contrast by removing the background noise. Why the other terms don’t fit as well: increasing gain amplifies all signals, so noise and real echoes are both boosted, not suppressed. Dynamic range controls the span of signal intensities that can be displayed but doesn’t actively filter out weak signals. Frame rate is about how many images per second are shown and affects motion display, not noise suppression.

The concept here is suppressing weak, noisy signals by setting a cutoff level. A threshold filters out anything below a certain amplitude, so faint echoes caused by electronic noise aren’t displayed. This makes the image cleaner and improves contrast by removing the background noise.

Why the other terms don’t fit as well: increasing gain amplifies all signals, so noise and real echoes are both boosted, not suppressed. Dynamic range controls the span of signal intensities that can be displayed but doesn’t actively filter out weak signals. Frame rate is about how many images per second are shown and affects motion display, not noise suppression.