A high-pass filter is a device or technique used in audio and signal processing that allows high-frequency signals to pass through while blocking lower frequencies. This means that sounds like treble notes or high-pitched instruments can be heard clearly, while deeper bass sounds are reduced. High-pass filters are commonly used in music production to enhance clarity and prevent muddiness in a mix. In addition to audio applications, high-pass filters are also used in various fields such as telecommunications and image processing. For example, in photography, a high-pass filter can sharpen images by emphasizing the edges and fine details, making the final picture more vibrant and clear.