位相 いそう偏移 へんい変調 へんちょうではありませんでした
isō hen'ihenchōdewa arimasendeshita

Noun
Desu Copula

The polite, past negative form of 位相偏移変調

1. Was not phase-shift keying.; Was not phase modulation.

Past/Perfective
Negative
Polite
Formal Register
Computing