Introduction to Digital TV and DVR
Digital television consists of several formats and standards, the most famous: the digital high definition television (HDTV). Besides the HDTV formats, but also a variety of formats known collectively as the standard definition television, more like traditional TV analog has been used since the 1940s, but offers additional features like the ability to group several programs into a single signal and potentially less distortion and interference.
HDTV is adramatic departure from traditional television. Unlike analog television, with its 525 horizontal lines per image, offer HDTV, the format, either 720 or 1080 horizontal lines, an image much clearer and details. HDTV may have also observed large format, similar to the movies to do and less distortion of the signal. A standard analog television receives radio waves reconstructed is modulated to a nearly square image. HDTV gets acrossElectronic digital signals as binary signals that the receiver is then translated into a flood of images virtually free of distortion broadcasting. How can send analog signals, digital signals are transmitted via broadcast, cable or satellite. HDTV offers 16 / 9 aspect ratio compared to the ratio 4 / 3 of the traditional TV. HDTV also offers digital sound, comparable to CD quality audio.
Digital TV hardware uses state-of-the-art computer technologyTo make it more efficient and highly functional. Digital TV stations to use computer technology to compress signals for transmission, allowing them to send two programs in a broadcast channel. The similar technique can provide a single program per channel. Technology mutual must exist on the receiving end to interpret the digital signal.
Even if the Federal Communications Commission (FCC) ruled that all commercial services available electronically by 2002 and analog signals,Items must cease the bickering-2006 standards has made a disappointing start of digital television. Definition of technical standards has been complicated by the diversity of economic interests in the digital medium. In addition to television producers to compete with other industries, their positions are heard, including carriers, manufacturers of broadcast equipment, cable system operators, manufacturers of computer screens and software developers. Often, that the greatest advantage for aThis has adverse effects on other industries. For example, fighting equipment manufacturers a standard that would allow computer problems existing display technology with the work of digital TV, but most traditional television channels and producers of technology which is close to other TV. Yes, more than once were all standards, but it is understood that one or more parties enter the agreement of the subscriber, and have to change. At the express request of the parties, the FCCmaintained a largely hands-off role, but regulators have been the inability of manufacturers to settle the dispute and has been bothered products on the market.
In November 2005, the U.S. Senate a budget bill, there are channels on April 7, 2009 to end traditional analog transmissions and paid $ 3 million with older televisions to help buy converter boxes for analog-digital qu they can get a signal after the switchover will be permanent. The month before the Houseapproved December 31, 2008 deadline for analogue and 1 billion U.S. dollars for the purchase of a converter. The case was brought before a House-Senate conference committee for final settlement of differences between the bills.
Some alternatives for receiving digital television, but not buying a new screen. Instead, some manufacturers have developed set-top boxes that allow digital conversion of analog TV signals are received. Such devices are necessary because the analog broadcasting is terminated because the TV –replacement rate is probably behind the adoption of digital standards behind.