Television signals were originally transmitted exclusively via land-based transmitters. Television genres include a broad range of programming types that entertain, inform, and educate viewers. Television genres that aim to educate and inform viewers include educational shows, DIY programs on cooking, gardening, or home renovation, history shows, performing arts programs, and documentaries. Television service providers also offer video on demand, a set of programs which could be watched at any time.
DTV is a new type of broadcasting technology that will transform television as we now know it. DTV technology will allow broadcasters to offer television with movie-quality picture and CD-quality sound, along with a variety of other enhancements. DTV technology can also be used to transmit large amounts of other data into the home, which may be accessible by using your computer or television set. DTV allows the same number of stations to broadcast using fewer total channels (less of the broadcast spectrum) which will free up scarce and valuable spectrum for public safety and new wireless services. DTV technology can also be used to provide interactive video and data services that are not possible with “analog” technology. DTV allows a number of new and better services. DTV is a more flexible and efficient technology than the current analog system. DTV can provide interactive video and data services that are not possible with “analog” technology. DTV provides viewers with sharper images, better sound, and more viewing options than have ever been available over the air.
A television system may be made up of multiple components, so a screen which lacks an internal tuner to receive the broadcast signals is called a monitor rather than a television. A television may be built to receive different broadcast or video formats, such as high-definition television (HDTV). The elements of a simple broadcast television system are:An image source. An antenna coupled to the output of the transmitter for broadcasting the encoded signals. An antenna to receive the broadcast signals. A receiver (also called a tuner), which decodes the picture and sound information from the broadcast signals, and whose input is coupled to the antenna. A typical NTSC broadcast signal’s visible portion has an equivalent resolution of about 640×480 pixels. It actually could be slightly higher than that, but the vertical blanking interval (VBI), allows other signals to be carried along with the broadcast. Higher frequencies behave more like light and do not penetrate buildings or travel around obstructions well enough to be used in a conventional broadcast TV system, so they are generally only used for MMDS and satellite television, which uses frequencies from 2 to 12 GHz.
Television and Young People (TVYP) is the UK’s leading forum for young people aspiring to work in television. Television shows are available in the US and UK only, and video availability varies by country. Television preservation is a relatively new field.