"Modern Communication Technology and Development Prospects" How to Transmit Information - Introduction to Communication Technology PPT Courseware 3

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"Modern Communication Technology and Development Prospects" How to Transmit Information - Introduction to Communication Technology 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

feedback exercise

1. Information theory shows that the higher the ______ of electromagnetic waves as carriers, the more ______ transmitted in the same time.

2. The operating frequency of television broadcasting is generally 30 MHz ~ 3×105MHz, and the operating frequency of sound broadcasting is generally 102 kHz ~ 30MHz. It can be seen that ______ broadcasting transmits more information than ______ broadcasting in the same time.

3. Microwaves are electromagnetic waves with frequencies between ______MHz and ______MHz. The properties of microwaves are closer to ______. They also generally propagate along ______. Microwaves ______ (optional "can" or "cannot") orbit along the surface of the earth. Therefore, a ______ must be built every ____km or so to process the incoming signals and then transmit them out to achieve long-distance communication.

4. The development of modern science and technology has enabled people to realize their dream of satellite communications. Satellite communication uses ______ as a relay station for microwave communication.

5. Evenly arranging 3 synchronous satellites over the earth will cover almost the entire earth surface, thus achieving

6． In fact, light is also an electromagnetic wave with a higher frequency than microwaves, while laser is light with a single frequency and highly concentrated direction.

7． Which of the following statements about geostationary satellites is incorrect ( )

A． The period of rotation of a geostationary satellite around the Earth is the same as the period of the Earth's rotation

B． Geostationary satellites can serve as relay stations for rebroadcasting microwaves

C. The speed of geostationary satellites is the same as the propagation speed of electromagnetic waves

D. In order for television programs from anywhere in the world to be transmitted to the whole world, at least three synchronous satellites are required

8. Which of the following descriptions about applying laser is incorrect ( )

A． Communication using lasers B. Precise measurements over long distances using lasers

C. Using laser to process hard materials D. Using lasers for general indoor lighting

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

"Modern Communication Technology and Development Prospects" How to Deliver Introduction to Information and Communication 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..

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

How does "Modern Communication Technology and Development Prospects" deliver PPT courseware about information and communication technology? Questions and Thoughts 1. What are the higher requirements for communication in modern politics, economy, military, scientific research, life, etc.? 2. What high technologies are used in modern communications? 3..

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Update Time: 2024-11-04

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