baseband

This term is primarily used in telecommunications and electrical engineering to describe signals that are transmitted without being shifted to a higher frequency. It refers to the raw, original signal, such as the voice in a telephone line or the data coming directly from a computer's processor, before it undergoes modulation for long-distance travel.

In a technical context, the adjective form often modifies hardware components, such as a baseband processor or baseband modem, which are responsible for the physical layer of communication. Because it describes a specific technical state of frequency, it is rarely used outside of engineering or computer science contexts.