1. clamper - Noun
2. clamper - Verb
An instrument of iron, with sharp prongs, attached to a boot or shoe to enable the wearer to walk securely upon ice; a creeper.
Source: Webster's dictionaryThe clamper does not restrict the peak-to-peak excursion of the signal, it moves the whole signal up or down so as to place the peaks at the reference level. Source: Internet
This is why tuned operation is sometimes called a clamper. Source: Internet