humcanceling
Hum canceling, also written as humcanceling, refers to techniques used to reduce or eliminate hum, a low-frequency electrical interference that appears in audio signals. Hum commonly originates from mains power (typically 50 or 60 Hz) and their harmonics, but can also arise from ground loops, EMI from nearby equipment, or power supplies. In recording, live sound, and instrument electronics, hum can mask desired signals and reduce clarity.
Techniques for hum canceling fall into passive, active analog, and digital approaches. Passive methods emphasize preventing
Hum canceling is widely used in microphone preamps, guitar and bass electronics with hum-canceling pickups, audio