Noun
descrambler (plural descramblers)
Something that descrambles; a device for decoding a scrambled signal.
Multiplicative scrambler/descrambler is defined similarly by a polynomial (for the scrambler on the picture it is ), which is also a transfer function of the descrambler. Source: Internet
The additive descrambler is just the same device as the additive scrambler. Source: Internet
The manipulations are reversed by a descrambler at the receiving side. Source: Internet