Where does “baseband” come from?

I cannot write this sentence because the etymology chain provided contains only "English base" repeated multiple times with no intermediate language steps, and the known meaning is listed as "(unknown)." To write an accurate one-sentence origin summary, I would need: 1. A complete chain showing actual language progression (e.g., English → French → Latin → etc.) 2. A known meaning or sense development to explain 3. Clarity on whether "baseband" is a compound and how its components relate to the chain Could you provide the correct etymology chain and known meaning for "baseband"?

baseband (English): The frequency range occupied by a message signal...