Notch filters

A Notch filter is a device or circuit that specifically removes or significantly reduces a narrow range of frequencies from a signal while allowing others to pass. Think of it as a precise filter that "notches out" a particular tone or noise, such as a specific electrical interference or a musical pitch, without affecting the rest of the signal. Notch filters are used in audio, communication, and electronic systems to eliminate unwanted frequencies and improve sound clarity or signal quality.