Digital Television We clarify what advanced TV is and its principal attributes. Moreover, its activity and what is simple TV.
What is digital television?
It is known as digital television or DTV (for its acronym in English: Digital TeleVision ) to a set of new technologies in audiovisual transmission and reception uses digital signals rather than traditional analog TV.
This means that while ordinary television is transmitted by radio waves in the VHF and UHF bands, or alternatively by analog signal coaxial cables, digital television uses binary signals that allow the return between consumers and producers, giving rise to all a new range of interactive television experiences and allowing the transmission of several signals on the same channel.
It is a TV upheaval that started towards the start of the 21st century, through the worldwide reception of various DTV measures in the various mainlands of the planet, as the countries and companies that provide this type of service took a step forward towards overcoming the analog.
There are several types of digital television, which are:
- Open (broadcast or free). It is broadcast through frequencies of 700 Hz of the radio spectrum, freely to all televisions compatible with digital TV or equipped with a specialized decoder.
- By cable. Identical to traditional cable television, except that the signal transmitted over the coaxial cable is digital.
- IPTV. The Television Protocol allows digital television transmission over the copper twisted pair used on the telephone line, such as ADSL.
- Satellite. The one whose mechanized sign is sent by methods for the satellite to all of the radio wires arranged in structures and homes, for instance, standard satellite TV.
Features of digital television
Digital television presents a series of interesting innovations compared to traditional television, such as:
- Accepts various formats. “TV can be transmitted in various goals, from 480, 576, 720 or 1080 pixels, both dynamic and joined, just as HD (High Definition).” Which represents a very substantial image improvement.
- It allows simultaneous transmissions. The transmission bandwidth can be subdivided to transmit different programming on different devices, in what is called multiplex technology.
- Allows interactivity. Digital television allows the sending of information from the home to the station and not only its reception, making the device an interactive experience. This is done through both public and private text messages.
- It has different standards. Each one adapted for a specific geographical area, such as ISDB-TB, DVB-T2 / H or ATSC.
How does digital television work?
Digital Television, in its many presentations, operates based on the use of the radio spectrum or the physical means of connection to transmit much more information than what was done analogically, through image and sound coding mechanisms that maximize quality. and reception speed.
In this way, the accessible data transfer capacity is utilized to transmit various bundles of packed data, rather than an uncompressed signal that possesses every last bit of it. A flow of up to 20 Mb can contain 4 or 5 different programs, in a single transmission channel, without counting on the retransmission of information, which would go from the device to the operator.
For this, the only necessary addition to ordinary televisions is a decoder, which interprets and decompresses the data packets and retrieves the signal directly to the display apparatus.
Analog TV is susceptible to surrounding noise that sabotages the sharpness of the transmission.
Analog or traditional television, unlike DTV, does not use binary but analog encoding, that is, similar to electrical, highly susceptible to noise caused by the environment and sabotaging the sharpness of transmission, especially in signals open radio (UHF and VHF).
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