頻率偏移調變

Multi tool use
Multi tool use




body.skin-minerva .mw-parser-output table.infobox caption{text-align:center}


















调制方式
連續調變
























调幅 调频 调角
模拟
AM
（SSB · DSB）
 FM PM
数字
ASK
（OOK · QAM）
FSK
（MSK · GFSK）
PSK
（CPM）
其他
SM （類比）

脈衝调制
模拟
PAM · PDM · PPM
数字
PCM · PWM
扩频

CSS · DSSS · THSS · FHSS
另見

调制 · 线路码 · 调制解调器 · ΔΣ調變 · OFDM · FDM

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BFSK實例，从上至下依次为数据、载波和调制后信号


頻率偏移調變，又稱頻率移鍵、頻移鍵控（FSK，Frequency-Shift Keying ）是一種利用頻率差異的訊號來傳送資料的調變方式。最常見的FSK為二進制FSK（BFSK，binary FSK，或称2FSK）。BFSK用兩個離散的頻率分别代表不同的二進制訊號（0和1），四进制頻移鍵控则称QFSK。[1]


Δf=|fmax−fmin|+2fs{displaystyle Delta f=|f_{max}-f_{min}|+2f_{s},}Delta f = | f_{max} - f_{min} | + 2f_s,

其中，Δf{displaystyle Delta f}Delta f为频帶宽度，fs{displaystyle f_{s}}f_{s}为原始信号带宽


中心载频fc{displaystyle f_{c}}f_c



fc=fmin+fmax2{displaystyle f_{c}={frac {f_{min}+f_{max}}{2}},}f_c = frac{ f_{min} + f_{max}}{2},[2]


调制



解调



注释




  1. ^ 调制方式－FSK频移键控


  2. ^ 移频键控（ＦＳＫ）[永久失效連結]




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