What is the device within a digital set-top box that recovers information or data from an RF carrier?

The device within a digital set-top box that recovers information from an RF carrier is called a demodulator. It processes the incoming radio frequency signals, extracting the modulated data, which is then decoded and converted into a format suitable for display on a television. This enables the set-top box to provide users with audio and video content transmitted over the airwaves or via cable.