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

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

Part One: Guidance Design

Learning point 1: Transmission and reception of radio broadcast signals

Materials: Figure 21-3-6 shows the working process of radio broadcasting.

Question: From the working process diagram of radio broadcasting, it can be seen that radio broadcasting is divided into two processes: _________ and _________. The first process is completed by ______________, and the second process is completed by _______________. Radio broadcasts rely on __________ to transmit information.

Learning point 2: TV transmission and reception

Materials: Figure 21-3-7 shows the working process of television broadcasting.

Question: Comparing with the working process of radio broadcasting, it can be seen that the working process of television broadcasting is ________ with the working process of radio broadcasting (optional "similar" or "dissimilar"). Television uses __________ to transmit image signals and sound signals.

Learning point 3 Mobile phone

Question: Comparison between mobile phones and landline phones: Landline phones use ________ in wires to transmit sound information, while mobile phones use ________ in space to transmit sound information. Mobile phones are both ____________________ and ____________________.

Radio, television and mobile communications PPT, part 2: summary of frequent exams

Type 1 Transmission and reception of radio broadcast signals

Example 1 Regarding the process of receiving radio broadcast signals, which of the following statements is correct ( )

A. Receive radio waves - tune and select the required electromagnetic waves - demodulate to obtain audio electrical signals - the earphone diaphragm vibrates and produces sound

B． Receive radio waves - detect and obtain audio electrical signals - tune and select the required electromagnetic waves - the earphone diaphragm vibrates and produces sound

C. Receive radio waves - the oscillator generates high-frequency oscillating current - detect and obtain audio electrical signals - the earphone diaphragm vibrates and produces sound

D. Receive radio waves - the oscillator generates high-frequency oscillating current - tune to select the required electromagnetic waves - the earphone diaphragm vibrates and produces sound

[Commentary by Famous Teachers]The key to answering this question is to clarify the process of receiving radio broadcast signals: receiving radio waves (antenna) → tuning and selecting the required electromagnetic waves (tuner) → demodulating to obtain audio electrical signals (demodulation detector or detector) → sound (headphones or speakers).

Type 2 TV transmission and reception

Example 2 (Multiple choice) Regarding the transmitting and receiving process of television, which of the following statements is correct ( )

A. The function of the carrier generator is to generate radio frequency current

B． The function of the microphone is to modulate the sound to a high-frequency oscillating current

C. The function of the modulator is to load the audio current and video current onto the radio frequency current

D. The function of the transmitting antenna is to emit electromagnetic waves containing only sound signals

Type 3 How mobile phones work

Example 3 With the advent of the "4G era", it has become more convenient for people to use smartphones to communicate. Which of the following statements is incorrect ()

A. Smartphones rely on electromagnetic waves to transmit information

B． In a vacuum, electromagnetic waves emitted by smartphones cannot propagate

C. When a smartphone battery is charged, electrical energy is converted into chemical energy

D. Smartphones can convert sound signals into varying electrical currents

[Commentary by Famous Teachers]Mobile phones rely on electromagnetic waves to transmit information. Mobile phones can both emit and receive electromagnetic waves. Mobile phones are small in size, have very low transmitting power, and do not have switching capabilities. They must rely on a set of high-power fixed stations (base stations) and switching centers for switching.

Type 4 audio, video and radio frequency

Typical Example 4 Figure 21-3-4 shows the waveform diagrams of radio frequency, video, and audio. Among them, A represents the ________ signal, B represents the ________ signal, and C represents the ________ signal.

Radio, television and mobile communications PPT, Part 3: Class feedback

1. Figure 15-1 shows a simple diagram of the radio broadcast process. The microphone converts the announcer's voice signal into an electrical signal, the modulator loads the audio electrical signal onto the ________ current, and then generates ________ through the antenna and transmits it into the air; the radio receives various electromagnetic waves and selects ones of specific frequencies. signal, the ________ signal is left through demodulation, and the announcer's voice is played out of the radio through the loudspeaker.

2. Xiao Ming’s explanation of the recording and playback process of Sanshui Lotus World TV shown in Figure 15-2 is correct ()

A. The camera converts electrical signals into light signals

B． The microphone converts electrical energy into sound energy

C. Speakers convert acoustic signals into electrical signals

D. The transmitter emits electromagnetic waves and transmits the signal to the receiver

3. The sound information of the mobile phone is transmitted by the ________ in space. The mobile phone is both a radio ________ station and a radio ________ station. When you use the mobile phone to talk to others, the mobile phone uses ________ to transmit the information. into the air, and at the same time it can capture ________ in the air and get the information of the other party's speech.

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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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