位い相そう変へん調ちょう

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Meanings

1

noun

phase modulation; PM

Technical term in telecommunications and signal processing; refers to modulating the phase of a carrier wave.

rank, grade, throne

相inter-, mutual, together

変unusual, change, strange

調tune, tone, meter

周しゅう波は数すう変へん調ちょう
Frequency modulation (FM) varies the frequency of the carrier wave, while phase modulation varies its phase.
振しん幅ぷく変へん調ちょう
Amplitude modulation (AM) varies the amplitude of the carrier wave, unlike phase modulation which varies the phase.

Compound of 位相 (phase) and 変調 (modulation), a direct translation of the English term 'phase modulation'.