周しゅう波は数すう変へん調ちょうMeaningsNoun1. frequency modulation; FMKanji used周circumference波a wave数number変change調tonePitch accentしゅうはすうへんちょうComposed of周しゅう波は数すうfrequency (esp. of waveforms)Noun変へん調ちょうirregularity; abnormality; anomaly; change of tone; transposition; modulationNoun