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Standard-definition television (SDTV; also standard definition or SD) is a television system that uses a resolution that is not considered to be either high or enhanced definition. [1] Standard refers to offering a similar resolution to the analog broadcast systems used when it was introduced.
- High-definition television - Wikipedia
The term has been used since at least 1933; [1] in more...
- Standard-definition television - Simple English Wikipedia ...
Standard-Definition Television is a kind of television...
- High-definition television - Wikipedia
Standard-Definition Television is a kind of television system that provides lower resolution than HDTV and higher resolution than analog TV does. The word 'SDTV' is generally used at the digital television broadcasting system that has a similar or litle bit higher state of resolution to the 'analog television system'.
The term has been used since at least 1933; [1] in more recent times, it refers to the generation following standard-definition television (SDTV). It is the standard video format used in most broadcasts: terrestrial broadcast television, cable television, satellite television.
- History
- Technical Information
- Comparison to Analog
- See Also
- Further Reading
Background
Digital television's roots are tied to the availability of inexpensive, high performance computers. It was not until the 1990s that digital TV became a real possibility. Digital television was previously not practically feasible due to the impractically high bandwidth requirements of uncompressed video, requiring around 200Mbit/s for a standard-definition television (SDTV) signal, and over 1Gbit/s for high-definition television(HDTV).
Development
In the mid-1980s, Toshiba released a television set with digital capabilities, using integrated circuit chips such as a microprocessor to convert analog television broadcast signals to digital video signals, enabling features such as freezing pictures and showing two channels at once. In 1986, Sony and NEC Home Electronicsannounced their own similar TV sets with digital video capabilities. However, they still relied on analog TV broadcast signals, with true digital TV broadcasts not yet being...
Inaugural launches
DirecTV in the US launched the first commercial digital satellite platform in May 1994, using the Digital Satellite System (DSS) standard. Digital cable broadcasts were tested and launched in the US in 1996 by TCI and Time Warner. The first digital terrestrial platform was launched in November 1998 as ONdigital in the UK, using the DVB-Tstandard.
Formats and bandwidth
Digital television supports many different picture formats defined by the broadcast television systems which are a combination of size and aspect ratio(width to height ratio). With digital terrestrial television (DTT) broadcasting, the range of formats can be broadly divided into two categories: high-definition television (HDTV) for the transmission of high-definition video and standard-definition television(SDTV). These terms by themselves are not very precise, and many subtle intermediate c...
Reception
There are several different ways to receive digital television. One of the oldest means of receiving DTV (and TV in general) is from terrestrial transmitters using an antenna (known as an aerial in some countries). This delivery method is known as digital terrestrial television(DTT). With DTT, viewers are limited to channels that have a terrestrial transmitter in range of their antenna. Other delivery methods include digital cable and digital satellite. In some countries where transmissions o...
Protection parameters
Digital television signals must not interfere with each other, and they must also coexist with analog television until it is phased out. The following table gives allowable signal-to-noise and signal-to-interference ratios for various interference scenarios. This table is a crucial regulatory tool for controlling the placement and power levels of stations. Digital TV is more tolerant of interference than analog TV.
DTV has several advantages over analog television, the most significant being that digital channels take up less bandwidth, and the bandwidth allocations are flexible depending on the level of compression and resolution of the transmitted image. This means that digital broadcasters can provide more digital channels in the same space, provide high-d...
Hart, Jeffrey A., Television, technology, and competition : HDTV and digital TV in the United States, Western Europe, and Japan, New York : Cambridge University Press, 2004. ISBN 0-521-82624-1Overview of Digital Television Development Worldwide Proceedings of the IEEE, VOL. 94, NO. 1, JANUARY 2006 (University of Texas at San Antonio)Standard-definition television (SDTV; also standard definition or SD) is a television system that uses a resolution that is not considered to be either high or enhanced definition. Standard refers to offering a similar resolution to the analog broadcast systems used when it was introduced.
Standard-Definition Television is a kind of television system that provides lower resolution than HDTV and higher resolution than analog TV does. The word 'SDTV' is generally used at the digital television broadcasting system that has a similar or litle bit higher state of resolution to the 'analog television system'.
People also ask
What does SDTV stand for?
What is standard-definition television (SDTV)?
What does HDTV stand for?
What is digital SDTV?
Standard-definition television (SDTV) is designed on the assumption that viewers in the typical home setting are located at a distance equal to six or seven times the height of the picture screen—on average some 3 metres (10 feet) away.
