"Modern Shunfeng Ear─Telephone" Information Transmission PPT Courseware 2

Description

"Modern Shunfeng Ear─Telephone" Information Transmission PPT Courseware 2

Modern and modern people’s methods of transmitting information

Using current or electromagnetic waves as carriers, humans can transmit and exchange information over long distances through coding and corresponding electrical processing technology.

1. Electric current transmits information to distant places

In 1876, telephone lines were opened in New York and Chicago. Bell, the inventor of the telephone, was the first to audition: "Hello, Chicago", and this historic sound was recorded.

Microphone: metal box, carbon particles, diaphragm

——Convert acoustic signals into electrical signals

Handset: permanent magnet, coil, thin iron diaphragm

——Restore electrical signals to acoustic signals

telephone exchange

The advantage of using a telephone exchange is: improving line utilization

Telephone exchange (development history)

Manual operation - operator

automatic control

Electromagnetic relay control

Electronic computer program control

Program-controlled telephone functions: caller ID, abbreviated dialing, busy callback, transfer call, three-way call...

summary

1. Telephone

(1) Composition of a telephone: The simplest telephone consists of a microphone and a handset. The telephone circuit is composed of the calling party's microphone and the called party's handset connected in series and connected to the power supply. The current passing through the handset is equal to the current passing through the microphone. equal.

(2) The working principle of the telephone: When a person speaks into the microphone, the microphone converts the sound signal into a current that changes in intensity. The current passes through the earpiece, and the earpiece converts the intensity of the current into sound, so that the called party can hear the sound.

Sound (vibration) → changing current → sound (vibration), this is the basic principle of the telephone.

Consolidation exercises

1. The simplest telephone is mainly composed of ______ and ______. The function of the microphone is to turn the ______ signal into a ______ signal. The function of the earpiece is to convert the ______ signal into a ______ signal.

2. The telephone receiver mainly uses electric current ( )

A. Thermal effect b. magnetic effect

C. chemical effect d. None of the above statements are correct

3. Among the following statements, which one is correct ( )

A. The function of the microphone is to transmit the sound directly to the recipient's earpiece

B． The function of the microphone is to convert the current signal that is strong or weak into a sound signal.

C. The function of the microphone is to convert the vibration of the sound into a current signal that changes in intensity

D. The function of the microphone is to send current directly to the recipient's earpiece

4. When the microphone converts sound into signal current, the changes of ______ and ______ of this signal current are exactly the same as the changes of ______ and ______ of ______, "imitating" the "every move" of the sound signal, The signal transmitted by this current is called _________.

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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 Courseware 5:

"Modern Shunfeng Ear─Telephone" Information Transmission PPT Courseware 5 The Generation and Propagation of Sound: Sound is produced due to the vibration of objects, and all sound-producing bodies are vibrating. Sound is propagated through media, and sound cannot be propagated in a vacuum. (1) ) Microphone 1. Microphone junction..

"Modern Shunfeng Ear─Telephone" Information Transmission PPT Courseware 4:

"Modern Shunfeng Er─Telephone" Information Transmission PPT Courseware 4 Telephone Learning Objectives 1. What are the two parts of the simplest telephone? Understand the knowledge on pages 93 to 94 of the textbook and be able to briefly describe the working principle of the telephone with the help of diagrams. 2. Telephone switch What is the role of the telephone exchange?

"Modern Shunfeng Ear─Telephone" Information Transmission PPT Courseware 3:

"Modern Shunfeng Ear - Telephone" Transmission of Information PPT Courseware 3 In ancient times, flying pigeons conveyed messages. Post stations configured by the government and civil servants carried letters. Special sounds, such as bells, drums, firecrackers, etc., were used to convey information. Lights, fire, etc. Such as Kongming Lantern, beacon fire and other transmissions...

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Update Time: 2024-07-22

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

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