"Radio, Television and Mobile Communications" Information Transmission PPT Courseware 3 Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!
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"Radio, Television and Mobile Communications" Information Transmission PPT Courseware 3
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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"Radio, Television and Mobile Communications" Information Transmission PPT Courseware 2:
"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 the radio station. The microphone converts the acoustic signal into an electrical signal. The modulator loads the audio electrical signal into a high-frequency electrical signal..
"Radio, Television and Mobile Communications" Information Transmission PPT Courseware:
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