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Introduction
HD is an abbreviation for High Definition. The term HD may also refer to a high-definition video content item, such as video shot in HDV or a format of DVD or Blu-ray Disc data storage disk. High definition is a digital or analog video signal with more than 720 lines of horizontal resolution. It can also be referred to as high definition television (HDTV), the digital television standard for North America, the United Kingdom and Japan, and High-Definition Multimedia Interface (HDMI). The abbreviation HD is used by a wide range of TVs cameras and others to designate a high definition signal worldwide.
High Definition
High definition (often abbreviated as HD) is a resolution that denotes a higher quality or a more refined image than the standard definition.
The Origin of High Definition
High definition is an electronic television format that was first developed in the United States and then later adopted in some other countries. It has a 16:9 aspect ratio and contains several lines of resolution. This format was developed in the late 1960s by the company CBS. The first HDTV broadcasts were started in June of 1998. These are broadcast by ABC, CBS, NBC, FOX, and PBS. HDTV broadcasts use digital signals for transmission so that viewers can get better quality pictures with HDTV receivers that are equipped with high-definition screens.
The Concept of High Definition
The concept of High definition is that the resolution is greater than or equal to 720 pixels wide and a maximum of 1080 pixels high. The HD specifications are limited to the four-colour signals, Red, Green, Blue, and Cyan. HD video can be captured by attaching a high-definition video camera to any video camera capable of capturing film. It is to be noted that most Sony digital still cameras also can capture pictures in HD quality too. The concept came when VHS became the standard size of a television’s videocassette disk, which was 1 to 2 inches (25 to 50 mm) in diameter. Initially, the VCRs that were available had a limited number of resolutions, only 525 lines or less. The Cinerama widescreen system was an idea intended to give the consumer a wider, more expansive picture by using curved screens with different aspect ratios. However, this did not really work because of technical limitations.
Applications of HD
HDTV has been used in interactive media as well, including home theatre and DVD/VCR combinations. DVD players are now available that have built-in HDTV tuners so that the video can be displayed on the TV screen.HDTV set-top boxes, discs, players, etc., are usually labelled as “High-definition Multimedia Interface” or HDMI. To create a high definition video image, both standard-definition and HDTV cameras use the same principle. A standard-definition camera uses one channel of an NTSC or PAL television to encode the brightness information, while a high- definition camera uses two channels.
The digital video formats used with HDTV include
- High definition TV – High definition TV is the first mass-marketed format of digital television. The term usually refers to the 1080p resolution format
- Hybrid high-definition TV – is a hybrid broadcast television system developed by NHK Science & Technology Research Laboratories, Japan Broadcasting Corporation (NHK), Japan Radio Company, and Sony Corporation
- High Density Digital TV – High Density Digital TV (HD-DTV) is the trademark name of an enhanced ATSC digital broadcasting standard which has been adopted in the United States
- High Definition (HD) TV – High Definition Television is a high quality television signal that can be received via terrestrial, cable, satellite, or internet connections
- High Definition TV – National Television System Committee (NTSC) High-Definition Television System. In the United Kingdom, Ireland, and other countries in Europe and around the world, high definition television is transmitted in HDTV 720p and 1080i formats with additional FM sound
Audio Technologies
- High definition TV – High definition TV is the first mass-marketed format of digital television. The term usually refers to the 1080p resolution format
- Hybrid high-definition TV – is a hybrid broadcast television system developed by NHK Science & Technology Research Laboratories, Japan Broadcasting Corporation (NHK), Japan Radio Company, and Sony Corporation
- High Density Digital TV – High Density Digital TV (HD-DTV) is the trademark name of an enhanced ATSC digital broadcasting standard which has been adopted in the United States
- High Definition (HD) TV – High Definition Television is a high quality television signal that can be received via terrestrial, cable, satellite, or internet connections
- High Definition TV – National Television System Committee (NTSC) High-Definition Television System. In the United Kingdom, Ireland, and other countries in Europe and around the world, high definition television is transmitted in HDTV 720p and 1080i formats with additional FM sound
Visual Technologies
There are various technologies being developed that will provide the viewers with a better quality picture in HD. The first of these is called high-definition television (HDTV), and it was developed in the late 1960s by CBS Corporation and was first transmitted in June 1998. HDTV has a resolution of 720 pixels wide by 1080 pixels high and has higher line rates than standard definition TV.
Conclusion
The HDTV is the future of television. The technology of High Definition Television (HDTV) was first developed in the late 1960s by CBS Corporation, and it was first transmitted in June 1998. HDTV has a resolution of 720 pixels wide by 1080 pixels high and has higher line rates than standard definition TV. The pictures and sounds in High Definition can be obtained through large screen TVs, home theatres, and other home entertainment devices. To create a high definition video image, a standard-definition camera uses one channel of an NTSC or PAL television to encode the brightness information, while a high-definition camera uses two channels.
