Learn Swedish: Sensorn blir väldigt varm och bilden blir brusig såvida man inte vilar. - The sensor gets very hot and the picture gets noisy unless one rests.

Yes, såvida inte translates to "unless" or "provided that... not". It is synonymous with om... inte but carries a slightly more formal or precise tone. In this sentence, you could swap it out and say ... om man inte vilar, and the meaning would be exactly the same.

Why does inte come before the verb vilar?

Because såvida is a conjunction that introduces a subordinate clause. In Swedish subordinate clauses, sentence adverbs like inte must always be placed before the conjugated verb. You might remember this from earlier levels as the BIFF-rule (Bisats: Inte Före Finita verbet).

Does brusig mean "noisy" in the sense of being loud?

No, brusig here refers specifically to visual "noise" or graininess, which happens when a camera sensor overheats. It comes from the noun brus, which means static, hiss, or white noise. If you wanted to describe a loud sound, a loud person, or a noisy room, you would use words like högljudd or bullrig instead.

What is the base form of Sensorn, and why doesn't it take the standard -en ending?