"Radio, Television and Mobile Communications" Information Transmission PPT Courseware 2

Description

"Radio, Television and Mobile Communications" Information Transmission PPT Courseware 2

1. Transmission and reception of radio broadcast signals

1. The transmission of radio broadcast signals is completed by radio stations

Microphone - converts acoustic signals into electrical signals

Modulator - loads an audio electrical signal onto a high frequency current

Antenna - generates electromagnetic waves to transmit high-frequency carrier signals into the air

2. The radio is responsible for receiving and restoring signals

Antenna - receives various electromagnetic waves

Tuner - selects the carrier signal of the desired station (demodulation)

Demodulation - Recovering the audio signal from the carrier signal

Speaker - converts audio electrical signals into sound

2. TV transmission and reception

1. Image signal working process

Camera - converts images into electrical signals.

Transmitter - loads an electrical signal onto a very high frequency current.

Antenna - transmits high frequency signals into the air.

2. TV receiver working process

Antenna - receives high-frequency signals containing sound and image information

Receiver - takes out and amplifies image and audio electrical signals

Display - restore image signal

Audio amplification - amplify and output weak audio electrical signals

3. 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 and landlines use base stations to communicate

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.

Class summary

1. The transmission of radio broadcast signals is completed by radio stations

2. Radios use electromagnetic waves to receive sound signals

3. Television uses electromagnetic waves to transmit images and sound signals.

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

5. Mobile phones (cell phones) use electromagnetic waves to transmit information

6. Landline telephones (landline phones) use changing electrical current to transmit information.

think

1. Why are the mobile numbers different?

Answer: Because the frequency of electromagnetic waves used by everyone's hands when transmitting information using their mobile phones is different.

2. Why can different channels be selected by pressing different buttons on the TV remote control?

A. Pressing different keys on the TV remote control can emit infrared electromagnetic waves of different frequencies. Just selected different channels.

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Update Time: 2024-11-22

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

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