Which type of filter will attenuate a specific band of middle frequencies?

A band-reject filter, also known as a notch filter, is designed to attenuate or reduce the amplitude of a specific range of frequencies while allowing frequencies outside of that range to pass through with minimal attenuation. This makes it particularly useful in applications where certain frequencies (like those that cause interference or unwanted noise) need to be minimized, such as in audio processing or communications systems.

In the context of the question, the focus is on attenuating a specific band of middle frequencies. A band-reject filter does precisely this by targeting the unwanted middle frequency range, effectively reducing interference while preserving the integrity of signals outside that band.

In contrast, a band-pass filter would allow a specific range of frequencies to pass without attenuation while blocking frequencies outside that range. Low-pass and high-pass filters allow signals below or above certain frequency thresholds, respectively, to pass while attenuating those above or below those thresholds. Therefore, the functionality of a band-reject filter aligns perfectly with the requirement to attenuate a specific band of middle frequencies.