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📜  模拟通信与数字通信的区别

📅  最后修改于: 2021-09-14 02:14:51             🧑  作者: Mango

1. 模拟通讯：
在模拟通信中，数据在发射器和接收器之间的模拟信号的帮助下传输。任何类型的数据都以模拟信号传输。任何数据都先转换为电子形式，然后通过通信通道传递。模拟通信使用一个连续信号，该信号在幅度、相位或其他一些特性上随时间的变化与变量的特性成正比。

下图说明了模拟通信系统：

2. 数字通讯：
在数字通信中，源和目的地之间的通信使用数字信号而不是模拟信号。它们的数字信号由离散值而不是连续值组成。在数字通信中，数据的物理传输以数字比特流的形式发生，即在点对点或点对多点传输介质上的 0 或 1。在数字通信中，数字传输数据可以作为离散消息分解成数据包，这在模拟通信中是不允许的。

下图说明了数字通信系统：

模拟通信与数字通信的区别：

S .No.                                  ANALOG COMMUNICATION             DIGITAL COMMUNICATION
01. In analog communication analog signal is used for information transmission. In digital communication digital signal is used for information transmission.
02. Analog communication uses analog signal whose amplitude varies continuously with time from 0 to 100. Digital communication uses digital signal whose amplitude is of two levels either Low i.e., 0 or either High i.e., 1.
03. It gets affected by noise highly during transmission through communication channel. It gets affected by noise less during transmission through communication channel.
04. In analog communication only limited number of channels can be broadcasted simultaneously. It can broadcast large number of channels simultaneously.
05. In analog communication error Probability is high. In digital communication error Probability is low.
06. In analog communication noise immunity is poor. In digital communication noise immunity is good.
07. In analog communication coding is not possible. In digital communication coding is possible. Different coding techniques can be used to detect and correct errors.
08. Separating out noise and signal in analog communication is not possible. Separating out noise and signal in digital communication is possible.
09. Analog communication system is having complex hardware and less flexible. Digital communication system is having less complex hardware and more flexible.
10. In analog communication for multiplexing 

Frequency Division Multiplexing (FDM) is used. 

 

 In Digital communication for multiplexing 

Time Division Multiplexing (TDM) is used. 

 
11. Analog communication system is low cost. Digital communication system is high cost.
12. It requires low bandwidth. It requires high bandwidth.
13. Power consumption is high. Power consumption is low.
14. It is less portable. Portability is high.
15. No privacy or privacy is less so not highly secured. Privacy is high so it is highly secured.
16. Not assures an accurate data transmission. It assures a more accurate data transmission.
17. Synchronization problem. Synchronization problem is easier.