CS-Notes/docs/notes/计算机网络 - 物理层.md
2019-06-09 22:59:34 +08:00

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* [通信方式](#通信方式)
* [带通调制](#带通调制)
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# 通信方式
根据信息在传输线上的传送方向分为以下三种通信方式
- 单工通信单向传输
- 半双工通信双向交替传输
- 全双工通信双向同时传输
# 带通调制
模拟信号是连续的信号数字信号是离散的信号带通调制把数字信号转换为模拟信号
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/c34f4503-f62c-4043-9dc6-3e03288657df.jpg" width="500"/> </div><br>
<img width="580px" src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/other/公众号海报2.png"></img>