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振幅偏移調制，又稱幅移鍵控[1][2]、振幅鍵移（英語：Amplitude-shift keying，ASK）是通過載波的振幅變化來表示數碼訊號的一種振幅調制方式。在一個ASK系統中，二進制符號1會通過一個固定振幅、固定頻率的載波訊號來表示。這一載波訊號會持續T秒。如果訊號的值為1，就會傳輸載波訊號，反之則不會傳輸載波訊號。
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