A high-pass filter is an electronic circuit that allows signals with a frequency higher than a certain cutoff frequency to pass through while attenuating (reducing) signals with lower frequencies. This means that it can effectively block unwanted low-frequency noise, making it useful in various applications like audio processing and communication systems. In audio equipment, for example, a high-pass filter can help remove rumbling sounds from a recording, ensuring that only the clearer, higher-pitched sounds are heard. This is particularly important in live sound settings, where clarity and quality of sound are crucial for the audience's experience.