"Radio Communication" Electromagnetic Wave PPT Courseware

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Lu Jiao Edition Ninth Grade Physics Volume 2	pptx	6 MB

"Radio Communication" Electromagnetic Wave PPT Courseware

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Upload Time: 2024-10-19

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"Radio Communication" Electromagnetic Wave PPT Courseware

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

Transmission and reception of television signals

1. TV signal transmission 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 signal reception 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

mobile phone

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

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

2. cordless phone

The auxiliary machine and the main machine rely on electromagnetic waves to transmit information.

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.

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Update Time: 2024-10-19

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"Radio Communication" Electromagnetic Wave PPT Courseware