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Digital media is digitized content such as graphics, text, video and audio that can be transmitted over the internet and the computer networks. It is also a kind of electronic media in which data is stored and transmitted in digital form contrary to the usual analog form.
The conversion and processing of the information in a digital media occurs in a digital format. There are several examples of digital media, but this paper is only going to analyze the digital television as a form of digital media (Jordan 15).
Digital Television (DTV)
Digital television is the transmission of video and audio in multiplexed signal, which is digitally processed as opposed to the analog data of the channeled separated signals of a non digital television.
It signifies the adaptation and implementation of a diversified number of broadcasting standards, which include the advanced television system committee (ATSC), the digital video broadcasting terrestrial (DVB-T), the terrestrial integrated services digital broadcasting (ISDB-T) and the digital terrestrial multimedia broadcasting (DTMB) (Kruger and Guerrero 31).
The advanced television system committee system uses the 8 level vestigial sideband for broadcasting terrestrial while the digital video broadcasting terrestrial system utilizes the coded orthogonal frequency division multiplexing modulation and also supports the hierarchical transmission.
The United States and some other few counties are the only ones that have adopted the advanced television system committee (ATSC). The digital video broadcasting terrestrial has to a large extent been adopted by most countries in Europe. On the other hand, the terrestrial integrated services digital broadcasting has a design that offers good reception to not only receivers that are fixed but also to the mobile or portable receivers.
This system utilizes the two dimensional interleaving and the OFDM. The hierarchical transmission supports up to three layers besides using the advanced audio coding and the MPEG-2 video. Japan is the only country that has notably adopted this standard.
Meanwhile, the digital terrestrial multimedia broadcasting utilizes the time domain synchronous (TDS)-OFDM technology that makes use of a pseudo random signal frame that serves as the training symbol OFDM block’s gaurd interval. The DTMB standard has been adopted in the People’s Republic of China, Macau and Hong Kong.
The broadcast television systems are supported by the digital television, which is displayed using a combination aspect of ratio and size. The digital terrestrial television broadcasting divides the format ranges into the standard definition television (SDTV) and the high definition television (HDTV).
The high definition television transmits the high definition video and can be transmitted over DTV in either the 1280*720 pixels using the progressive scan mode or the 1920×1080 pixels by the use of interlaced video mode. Both of them require the 16:9 aspect ratio for transmission.
This makes the high definition television incapable of being transmitted using the analog systems that most current television sets utilize. This helps curb the issues that arise due to channel capacity.
The standard definition television uses different technological formats depending on the technological applications of the territorial country.
Cases in point include the use of 4:3 broadcasts in 640×480 format in NTSC countries and 720×576 in PAL countries. The 16:9 broadcasts uses the 704×480 format in NTSC countries and 720×576 in PAL countries. In order to save the bands, these resolutions can be reduced by broadcasters (Benoit 46).
Digital media has revolutionized the media industry and made data storage, processing and transmission easier. In this event many media players have embraced such technologies in their operations. The digital television has ensured that the analog television system stays in the past as it provides the viewers with crystalline clear images. It should therefore be the way to go for every media house and every viewer.
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Benoit, Herve. Digital Television: MPEG-1, MPEG-2 and Principles of the Dvb System. Oxford: Focal Press, 2002. Print.
Jordan, Peter. Digital Media. Ultimo: Career FAQs, 2007. Print.
Kruger, Lennard G., and Peter F, Guerrero. Digital Television: An Overview. Hauppauge:Nova Publishers, 2002. Print.