What is the primary function of a multiplexer in a recording unit?

The primary function of a multiplexer in a recording unit is to combine multiple signals into one. This process is essential in systems where various data streams are being handled, allowing for efficient transmission or storage of information. In the context of video recording, a multiplexer can take input from various cameras or sensors, combining them into a single stream. This combined signal can then be recorded onto a storage medium or transmitted for further processing. By using a multiplexer, a system can manage multiple inputs without the need for separate recording mechanisms for each signal, streamlining the overall operation and making it more efficient.