"Modern Shunfeng Ear─Telephone" Information Transmission PPT Download

Description

"Modern Shunfeng Ear─Telephone" Information Transmission PPT Download

Part One Content: A Classification Practice of Knowledge Key Points

Knowledge point 1 Telephone and telephone exchange

1. In 1876, ________ invented the telephone. The simplest phone calls consist of ________ and ________. The function of the microphone is to convert the ________ signal into a ______ signal; the function of the earpiece is to convert the ______ signal into a ______ signal.

2. Regarding the working process of the telephone, there are the following sentences. The correct order is ()

①The diaphragm presses the carbon particles sometimes loosely and sometimes tightly

②When a person speaks into the microphone, sound waves cause the diaphragm to vibrate.

③Resistance changes

④The attraction force of the electromagnet to the diaphragm is constantly changing, causing the diaphragm to vibrate. The vibration situation is the same as the other party speaking.

⑤A current whose intensity changes according to sound vibration is generated in the circuit.

A. ①②③④⑤ B. ②①③⑤④C. ②①④③⑤ D. ①②③⑤④

3. (Multiple choice) The correct statement about telephone exchanges is ()

A. The emergence of telephone switches has greatly improved the utilization rate of telephone lines

B． When making a call, if "busy" appears, it must be because the other party's phone is in use.

C. Early telephone exchanges relied on operators to manually connect and disconnect lines, which was inefficient.

D. Modern program-controlled telephone exchanges utilize electromagnetic relays for wiring

Modern Shunfeng Er Telephone PPT, Part 2: Comprehensive Practice of B Law Methods

7． (Multiple choice) Which of the following statements is correct ()

A. If there are many users who want to talk between two switches, the telephone line between them is not enough, and a "busy" phenomenon will occur. This phenomenon is common when making long-distance calls.

B． Telephone microphones and receivers contain electromagnets

C. Digital signals can be easily processed by electronic computers

D. Analog communication is better than digital communication

8. The microphone in the phone changes the sound into ____________. When you speak into the microphone, the diaphragm in the microphone ____________ compresses the carbon particles, and their ____________ changes accordingly. The ____________ flowing through the carbon particles changes accordingly, thus forming a sound that changes with the sound. signal of.

Modern Shunfeng Er Telephone PPT, the third part: Practical practice of C high-frequency examination questions

9. Digital communication is a modern and ancient communication method. Modern telephones have all used digital signals for processing. If "0" and "1" are used to represent the two actions of "on" and "off", they form a set of digital signals. , can express a sentence. For example: the digital signal of "I believe you can do it" is "0, 01, 1, 10, 00".

Please refer to this code and the above example to use another set of signals to express what you want to say: ______________, whose digital signal is ____________________.

Keywords: free download of PPT courseware for ninth-grade physics from the People's Education Press, PPT download of information transmission, PPT download of modern Shunfeng Er telephone, .PPT format;

For more information about the PPT courseware "Transmission of Information Modern Shunfeng Er Telephone", please click the Transmission of Information ppt Modern Shunfeng Er Telephone ppt tag.

"Modern Shunfeng Ear─Telephone" Information Transmission PPT Teaching Courseware:

"Modern Shunfeng Ear - Telephone" Information Transmission PPT Teaching Courseware Part One: Guidance Design Learning Point 1 Telephone Question 1: The simplest telephone consists of ________ and ________. Question 2: As shown in Figure 21-1-2, when speaking into the microphone,...

"Modern Shunfeng Ear─Telephone" Information Transmission PPT:

"Modern Shunfeng Ear─Telephone" Information Transmission PPT Part One: Knowledge Points Basic Knowledge Point 1 Current transmits information to distant places 1. The microphone of the old telephone turns the sound into a changing current, and the current transmits the information to distant places along the wire . At the other end, electricity...

"Information Age" Information Transmission PPT Courseware 2:

"Information Age" Information Transmission PPT Courseware 2 Why do people say that we have entered the information age? Think and discuss: When you encounter an emergency in the wild, what method will you use to send a distress signal? Set off fireworks: Setting off fireworks is the most common method of calling for help. white..

File Info

Update Time: 2024-07-02

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

Preview