A high-pass filter is a circuit that allows high-frequency signals to pass while attenuating low-frequency signals. Its basic structure usually consists of capacitors and inductors (or resistors), which create high impedance below a specific cutoff frequency, blocking low-frequency components and allowing only signals above that frequency to pass through.

     In electronic systems, high-pass filters are commonly used to remove DC bias or low-frequency interference. For example, in audio circuits, they eliminate low-frequency noise to make sound clearer; in wireless communication systems, they isolate different frequency bands to ensure high-frequency signals are not affected by low-frequency interference.

      In addition, high-pass filters are widely used in image processing and sensor signal analysis. In image processing, they enhance edge details and highlight high-frequency textures; in measurement and control systems, they help extract rapidly changing signal components, improving system response speed and accuracy.

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