The domestic high-definition TV market, the emergence of pseudo HD tv"

CCTV will be in September in Hangzhou, Chengdu, Chongqing and Dongguan 4 city launched the first high-definition digital TV channel "charges on the occasion, experts remind consumers:" there are "pseudo HD TV" phenomenon of domestic high-definition TV market, many products with "HD" as a gimmick to mislead consumers." It is understood that the current CCTV HD digital reserve has reached 2600 hours, a collection of HDTV programs the best quality at home and abroad. But users want to watch high-definition TV programs, in addition to the signal source, but also must have a high definition tv. Tsinghua University digital TV transmission technology research center experts believe that now, there is no real sense of high-definition tv. What is the true HD TV surveys show that many consumers do not know the digital TV signal has HD and SD points. American Consumer Electronics Association will be divided into digital television (HDTV), enhanced definition television (EDTV) and standard definition television (SDTV) three categories. The high-definition digital TV horizontal resolution should be at least 720 lines, the screen aspect ratio should be 16:9, which is consistent with the requirements of the draft national standards. The so-called resolution refers to the display of the television image is composed of many pixels, the pixels on the screen, the more, the higher the resolution. If a screen resolution of 1024 x 768, then each line has a total of 1024 pixels, each column has 768 pixels. The traditional standard definition display pixel is 720 x 576, and the pixel of the high definition display is about 1920 x 1080, which is often called the 720 line. And real digital TV is not only a TV receiver, also includes sending, transmitting and receiving the whole process. High definition TV program source resolution is 4 times more than the standard definition program, which resulted in HD and SD signal transmission of different signal transmission bandwidth, according to experts, it is now possible to transmit 4 sets of bandwidth can only transmit SD program a set of HD programs. HD TV was misleading many businesses spotted HD "represent the general trend in the promotional products, the blind use of" HD "concept to mislead consumers, or with" HD "is equal to" liquid crystal "concept to consumers, or let consumers think, if only can watch high-definition high-definition television signal the TV show. "In fact, LCD, rear projection, plasma and CRT can become part of the high-end color TV HD TV, as long as the 16: 9 ratio, display resolution over 720 lines on the line. Currently, more than 90% of flat-panel TVs sold on the market, are supported to receive high-definition digital TV signals, which is the technical characteristics of high-end flat-panel TV itself decided." Experts at the Tsinghua University digital television transmission center technology research center, "but does not mean that the TV to buy a home can watch high-definition digital TV, users also have to pass a special decoder (also called set-top box) decoding and conversion, signal input to the tv." HD TV faces market test present HD signal program is also very small, there may be some CCTV television program reserves, but in some places, due to technical reasons, it is difficult in a short time a large number of high-definition digital program. According to reports, this year, "national standards for digital television terminal products (Draft)" will be completed. In this part of the draft standard, the "digital TV" display standard and resolution to make a clear specification: digital TV screen length and width ratio of 16 to 9, and the image definition to achieve more than 720 lines, not up to the requirements of the product will become the standard of digital television quasi sense. The resulting problem is that support HD signal display in an SD signal program, will seem to feel a bit strange, black edge or screen edge, or tune into full screen display screen, when the proportion of distortion. In addition, for receiving the digital signal has been installed in standard definition set-top box users to watch high-definition TV, set-top box must be replaced, and high-definition signal transmission bandwidth restrictions lead to the increase of transmission cost, so the new set-top box price than the standard set-top box clear signal, there will be doubled. Consumers are willing to pay a relatively high price of cable TV fee, which is the market test of high - Definition TV to face.