An encoding filter was a technology installed in Starfleet communications systems.

In 2373, after Lieutenant Tom Paris's shuttle became trapped in an unstable interfold layer between space and subspace, his crewmates on the USS Voyager were able to re-establish contact with him by adjusting their encoding filter, and instructing Paris to calibrate to a theta-band frequency. (VOY: "Real Life")

Community content is available under CC-BY-NC unless otherwise noted.