"Modern Communication Technology and Development Prospects" How to convey information - Introduction to Communication Technology PPT courseware

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"Modern Communication Technology and Development Prospects" How to convey information - Introduction to Communication Technology PPT courseware

Questions and Thoughts

1. What are the higher requirements for communications in modern politics, economy, military, scientific research, life, etc.?

2. What high technologies are used in modern communications?

3. Can you feel the rapid development of communication technology from the changes in mobile phones and network functions?

1. Mobile phone

1. Mobile phone: (two-in-one transmitter and receiver)

A mobile phone is both a radio transmitter and a radio receiver.

Cell phones communicate with cell phones through base stations

2. cordless phone

The landline phone is connected to the local telephone network and is equivalent to a small base station.

The working area ranges from tens to hundreds of meters.

2. Network communication

Computers can process various information at high speeds, and can connect computers together to enable network communication.

Through the Internet, you can send and receive emails, see constantly updated news, and find all kinds of information you need.

With the development of communication technology, it is now possible to transmit an increasing amount of information in a short period of time. The speed of information transmission can even meet the needs of moving pictures such as TV. We can already easily watch TV online.

3. Optical fiber communication

Light is an electromagnetic wave with a much higher frequency than microwaves.

The "highway" of optical communications is wider.

The use of lasers with a single frequency and highly concentrated direction for communication works very well.

Optical fiber communication technology has only been developed in recent decades

In 1966, the Chinese physicist Kao Kun first proposed the concept of low-loss (20 db/km) optical fiber (referred to as optical fiber) using the principle of radio waveguide communication.

In 1970, Corning Company of the United States successfully developed quartz optical fiber with a loss of 20 db/km for the first time, which is an ideal transmission medium.

In 1970, Bell Labs successfully developed a continuously oscillating semiconductor laser (LD) at room temperature. Since then, the era of rapid development of optical fiber communications has begun.

Advantages of fiber optic communication:

(1) The transmission frequency band is extremely wide and the communication capacity is large;

(2) Optical fiber has small attenuation, no relay equipment, and long transmission distance;

(3) The frequency is stable and the signal transmission quality is high;

(4) Optical fiber resists electromagnetic interference and has good confidentiality.

4. Satellite communications

Most communication satellites are "stationary" relative to the earth - synchronous satellites

Three geostationary satellites enable global communications

Class summary

The higher the frequency of electromagnetic waves, the more information can be transmitted in the same time. The frequency of communication is getting higher and higher, and the road to information is getting wider and wider.

Mobile communications, network communications, optical fiber communications, satellite communications.

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How to transmit information in "Modern Communication Technology and Development Prospects" - Introduction to Communication Technology PPT Courseware 3:

"Modern Communication Technology and Development Prospects" How to Deliver Information and Communication Technology Introduction PPT Courseware 3 Microwave Communication Advantages: Large capacity, one microwave line can open thousands or even tens of thousands of telephone lines Disadvantages: Relay stations must be built every 50km, signal degradation, time Delay..

How to transmit information in "Modern Communication Technology and Development Prospects" - Introduction to Communication Technology PPT Courseware 2:

"Modern Communications Technology and Development Prospects" How to Deliver Introduction to Information and Communications Technology PPT Courseware 2 Teaching Objectives: Knowledge and Abilities Understand the basic situation of mobile communications, network communications, optical fiber communications, and satellite communications. Process and Methods By reading relevant information and teachers..

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Update Time: 2024-11-22

This template belongs to Physics courseware Beijing Normal University Ninth Grade Physics Volume 2 industry PPT template

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