Short for Digital Television, it is a digital television standard that is fast replacing analog (or NTSC analog) television. DTV enables broadcasters to offer television with movie-quality picture and sound. It also offers greater multicasting and interactive capabilities. While many use the terms Digital Television (DTV) and High-definition Television (HDTV) interchangeably, they are, in fact, two different things. DTV refers to the actual TV signal being transmitted digitally (instead of as an analog signal). DTV offers several broadcast options, two of which are considered to be HDTV formats. Some of the more common DTV standards include:
480i: -the digital version of current analog signals.
480p: – provides a sharper image and looks closer to HDTV than regular television. Today all DVDs can be played on EDTV.
720p: – provides an image close in quality to 1080i, but allows 480p signals to be broadcast as well.
1080i: – the most detailed HDTV image available from broadcast TV
The numbers above represent the vertical resolution, while the letters represent interlaces or progressive scan (i) (p). For example, 1080i represents 1080 vertical resolution, interlaced. For more information on the complete list of current DTV standards, you can visit the ATSC Web site listed in the links section below.
A U.S. Senate panel has set an April 7, 2009, as the deadline for television stations to switch entirely from analog to digital broadcasts. Analog televisions will work until all analog broadcasting ceases. Once the transition to complete DTV has taken place, a converter will be required to receive DTV signals and change them to the analog format of these older types of televisions. However, these DTV-to-analog converters will not produce true DTV quality.
(1) Short for Digital Video Broadcasting Project (DVB), DVB is an industry-led consortium of more than 260 broadcasters, manufacturers, network operators, and regulatory bodies and others in over 35 countries committed to designing global standards for the global delivery of digital television and data services. (2) Short for Digital Video Broadcasting, is the name used […]
Short for Digital Video Broadcasting – Handhelds, the DVB-H specification for bringing broadcast services to battery-powered handheld receivers that allows the receiving device to move freely while receiving the transmission. DVB-H was formally adopted as an ETSI standard in November 2004.
An optional application type specified in the Multimedia Home Platform (MHP 1.1) standard for digital video broadcasting. DVB-HTML complies with the W3C’s XHTML requirement, and supports XHTML, CSS and the DOM. DVB-Java is also specified in the MHP.
An application programming interface (API) for digital video broadcasting. Applications are written in Java using the MHP (Multimedia Home Platform) API. DVB-Java applications are called Xlets. DVB-Java is also also called DVB-J. DVB-HTML is also specified in the MHP.
Short for Digital Video Broadcasting Multimedia Home Platform, DVB-MHP is an open middleware system for interactive digital television. Also called MHP (Multimedia Home Platform), MHP is the standard that specifies an application execution environment for digital interactive TV. MHP is independent of vendor-specific hardware and software. The standard also defines the form in which applications […]