# Modulations

#### ASK

Amplitude-shift keying

#### FSK

Frequency-shift keying

#### PSK

Phase-shift keying (1正向 0反向)

#### DPSK

Differential Phase-shift keying (相对前一个，1反向 0同向)

### 各种编码

#### NRZ

Non Return to Zero codes

#### RZ

Return to Zero

#### CMI

Coded Mark Inversion

#### AMI

Alternative Mark Inversion

#### HDB3

High Density Bipolar of Order 3 code

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