周しゅう波は数すう変へん調ちょう

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Meanings

1

noun

Technical term used in radio, telecommunications, and signal processing.

周circumference, circuit, lap

波waves, billows, Poland

数number, strength, fate

変unusual, change, strange

調tune, tone, meter

振しん幅ぷく変へん調ちょう
Amplitude modulation (AM), the other main analog modulation method, where the amplitude of the carrier wave is varied instead of its frequency.

Compound of 周波数 (frequency) and 変調 (modulation), a direct translation of the English term 'frequency modulation'.