Humbuckers get their name from the fact that they cancel out the interference induced by alternating current, which is normally experienced with single coil pickups. This interference can cause artifacts or "video noise". The Humbucker will eliminate this noise.
The Gentner Digital Hybrid I is designed to digitally clarify incoming telephone calls that will be broadcast on the air. The system keeps connection noises from reaching your listening audience. Additionally, automatic nulling optimizes individual line conditions upon connection. Once the line is connected, the Digital Hybrid I continues to automatically adapt to telephone line conditions, providing the best possible telephone audio, call after call.