What is the primary function of a high-frequency filter?

The primary function of a high-frequency filter is to attenuate undesirable fast frequencies. High-frequency filters are designed to allow low-frequency signals to pass through while reducing the amplitude of high-frequency signals that can be considered noise or irrelevant to the analysis at hand. This is particularly important in various applications, including sleep studies, where artifacts from high-frequency noise can obscure the desired signal.

In this context, the inclusion of options that talk about attenuating slow frequencies or eliminating DC voltages is less relevant. While eliminating DC voltages may be a function of certain types of filters (such as high-pass filters), it is not a characteristic that defines high-frequency filters specifically. High-frequency filters are primarily concerned with managing and reducing high-frequency noise to ensure the clarity and quality of the lower frequency signal being measured or recorded.