unscrambler

[uhn-skram-bler]

noun

a person or thing that unscrambles.
Also descrambler. an electronic device that makes scrambled telecommunications signals intelligible by systematically tuning the receiver to the frequencies used in transmission.Compare scrambler(def 2).

Origin of unscrambler

First recorded in 1950–55; unscramble + -er¹

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Gus, here, he's a unscrambler that can make any kinda scanning pattern.
The Machine That Saved The World
William Fitzgerald Jenkins