What are the characteristics of ancient, modern and modern information transmission?

Ancient times: the postman traveled long distances; Features: Long transmission range; Long transmission time; Modern: transportation system relying on vehicles; Features: wide transmission range and limited transmission; Modern: telegraph, telephone; Features: fast speed, wide range and limited use; Contemporary: radio, television and computer networks; Features: fast speed, wide range, large radiation, easy to accept bad information.

Extended data:

Information transmission: transmission function: information plays a very important role in people's social life. For example, scientific research should not only obtain other people's research results in time, but also publish and tell others their own research results in time. Only by exchanging information with each other in this way can we continue to develop.

In the war, we should not only get the information of the enemy in time, but also convey various operational orders to the officers and men. When doing business, we must know the information of local markets in time before we can decide what to buy, where to buy, where to sell and what to sell.

In daily life, we must get timely information about weather, commodities, cultural and sports activities, work and life of friends and relatives, and often tell friends and relatives about our work and life. In a word, only by constantly exchanging information can people make their production and life activities go on normally, and people can't live without information for a moment.

Because information is valuable, things that are useful to people will be passed on to each other. In technical terms, the value of information is called the amount of information, and the unit is bits. When you download something, you see 20bps, which means you receive 20 bits of information every second.

Transmission characteristics: Information system is a data-intensive, man-machine interactive computer application system whose main purpose is to provide information services. It has four technical characteristics: it involves a large amount of data. Generally, data need to be stored in auxiliary memory, and only a small part of the data to be processed is temporarily stored in memory.

Most of the data is persistent, that is, it does not disappear with the end of the program, but needs to be stored in the computer system for a long time; These persistent data are shared by multiple applications, even in a unit or a larger scope.

Besides the basic functions of data collection, transmission, storage and management, it can also provide users with information services such as information retrieval, statistical report, transaction processing, planning, design, command, control, decision-making, alarm, prompt and consultation.

Baidu encyclopedia-information transmission