In telecommunications and electronics, the original frequency range of a signal before it is modulated for transmission.
From 'base' (fundamental) and 'band' (a range of frequencies), combining in modern electrical engineering terminology around the mid-20th century as radio and electronics became sophisticated.
Your WiFi router is constantly doing the baseband-to-modulated dance: it takes your internet data in baseband form, shifts it to a specific frequency, broadcasts it, then your device reverses the process. It's like a language translator that works billions of times per second!
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