What type of filter would you use to allow a specific band of frequencies to pass while rejecting others?

The correct choice is a band-pass filter, which is specifically designed to allow a certain range of frequencies to pass through while attenuating frequencies outside of that range. This type of filter is crucial in applications where it is necessary to isolate specific signals from background noise or to limit the frequency range that reaches the output.

A band-pass filter works by combining the functions of both a low-pass and a high-pass filter. It allows frequencies that are within a defined bandwidth to pass, while filtering out frequencies that are lower than the lower cutoff frequency and higher than the upper cutoff frequency. This ability to select a specific frequency range makes band-pass filters widely used in various fields such as audio processing, telecommunications, and signal processing.

In contrast, a band-stop filter would reject a specific range of frequencies, allowing others to pass, which does not meet the requirement of allowing a specific band to pass. A low-pass filter permits frequencies below a certain threshold, while a high-pass filter allows frequencies above a certain threshold, neither of which can selectively allow a set band of frequencies to pass through. Thus, the band-pass filter is the appropriate choice for scenarios where isolation of a specific frequency band is needed.