What are notch filters?

Answer 1

Notch filters are electronic filters designed to selectively attenuate a narrow band of frequencies while allowing all other frequencies to pass through with minimal loss. They are commonly used to eliminate unwanted signals or noise, such as hum from power lines at 60 Hz or 50 Hz, in audio and communication systems. Notch filters can be implemented in both analog and digital forms, and their effectiveness is determined by the width of the notch and the depth of attenuation.