ELEMENTS / RADIO / TV
TV
TV / RADIO
TV/RADIO/VIDEO
DIGITAL VS ANALOG
100
Which type of cables are used for transmission?
There are two types of cables used for transmission / transmitting / broadcast:
1. Copper wires covered by plastic: This wires called coaxials have an inner conductor covered with a dielectric material (is not exactly plastic). After this layer of dielectric material plastic, there’s another shield of copper (metal or conductor material which is not necessarily copper) to avoid other electromagnetics forces, and finally, another layer of plastic covers it.RIGHT!
2. Optical fibre wires: Very thin glass threads recovered by glass of less purity, and after that, there’s a cape of plastic.
They have more transmission capacity.
100
What different types of camera are there?
Analog cameras: They record the images in magnetic tapes.
Digital cameras: They record the images in digital form.
100
What does the transmitter do?
It creates signals for image and sound that combine and emit a carrier wave, that can be sent via satellite.
100
Yes.
100
What different types of camcorders exist?
Analog camcorders and digital camcorders.
200
What are the radio waves?
The radio waves are disturbances caused by electrical discharges that are transmitted in the form of waves.
200
Name the different types of digital television.
• Satellite Television (Televisió per satèl·lit)
• Cable Television (Televisió per cable)
• Terrestrial Television TDT (Televisió terrestre)
• ADSL Television (Televisió a través d’ADSL)
200
How does cable television work?
It uses optic fiber. This allows voice transmission, data, images, video, sound, music, etc. It offers the traditional TV programs, video on demand, video on request, tvsell services, and other interactive services.
200
What types of radio waves propagation are there?
Short-haired emissions, Long wave emissions, VHF and UHF waves, and Microwaves.
200
What are the different types of analog camcorders?
8mm, VHS-C and HI-8.
300
What are the main characteristics of radio waves?
The wavelength: The distance between the beginning and the end of the wave and is measured in meters, they can be short (1 to 10 m), medium (10 to 1000 m) and long (more than 1000 m)
The frequency: The number of waves produced per unit of time.
300
How do VHF and UHF waves expand? How are they transmitted?
They expand in a straight line and they cannot overcome obstacles. They are transmitted by communication satellites or by high tower placed so that they do interfere with the signal.
300
What is the radio, and how can it be emitted?
The radio is a means of communication that sends electrical signals produced by a microphone in a wave of higher frequency, called wave-carrier
The signal can be issued in two ways: AM or FM
300
What are the characteristics of a high definition television?
t has 720 horizontal progressive lines (720p), or 1080 horizontal progressive lines.
While 720p get clearer images and better results when emitting moving images, with 1080p you get more precision in the images.
The television signals are transmitted and received digitally.
300
What format can digital cameras record in?
In digital format, in mini DV, DV, DVCam, DVD and hard drive tapes.
400
What different types of television are there?
Analog TV: It uses magnetic waves to transmit sound and images.
Digital TV: It emits the signals converted into bits, which are transformed into images and sounds by a device at the reception point.
400
What was the first communication media for humans? Why didn’t it work?
It was oral language, it didn’t work because it could not transmit messages through long distances.
400
Does this image show the parts of a radio transmitter?
No. It is TV camera
400
What does HDMI mean?
High Definition Multimedia Interface.
400
Analog signal is continuous and digital is not.
Is that true?
Yes.
500
How can we receive digital television?
TV by satellite
TV by wire
Digital terrestrial TV (TDT)
TV via ADSL
500
How do pixels affect to video quality? In what type of camera are there more pixels?
The more pixels there are the better quality the video is. Digital cameras have more pixels, therefore, better quality.
500
What is a television?
Television is a means of communication that transmits images in motion and sound simultaneously.
500
What are camcorders?
The camcorders are cameras that record the images captured on magnetic straps.
500
What are the characteristics of camcorders?
-Analog camcorders:They record images on magnetic strips and have CDD devices between 350000 and 450000 pixels.
-Digital camcorders:They provide better image quality, because they have CCD devices of more than 800,000 pixels. Some cameras have even three CCD devices