encoder

/ɪnˈkoʊdər/
noun
  1. A device or program that converts information into a code or a specific format.
    • The video encoder compresses the file for online streaming.
    • The audio encoder converts analog sound into a digital signal.
    • An encoder on the motor tracks its rotation speed.
  2. A person who encodes messages or data.
    • During the war, the encoder worked in a hidden room.
    • The encoder carefully translated the secret message into numbers.
    • The data encoder entered all the survey responses into the system.
Antonyms