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HC Network Security Digital TV one machine is the role of the built-in tuner, can directly receive, play high-definition programming signal, to achieve the "full digital" audio and video processing, but also to avoid the high definition signal in the transmission of mass loss during the conversion process. High-definition digital TV programs on the ground under the premise of signal transmission, the audience will be able to directly turn on the TV to watch high-definition digital TV programs, which is considered a true digital television. Digital TV One machine has the following advantages: 1, signal processing and transmission quality depends on source Because the digital equipment only output 1 and 0 2 levels, recovery does not study the size, so the signal stability, strong anti-interference, is very suitable for long-distance digital transmission. In many digital signal processing and transmission into the clutter, its clutter by not more than a nominal level, can be removed by digital regeneration; even if the clutter introduced by more than the rated value, causing the error, you can also introduce error correction channel coding technology, corrected in the receiving end. Therefore, digital transmission will not reduce the signal to noise ratio, to avoid non-linear distortion of the system, greatly improved image quality. In the simulation system, the non-linear image distortion will cause significant damage, such as non-linear phase distortion generated will lead to color distortion. The analog signal processing and transmission, each able to introduce a new clutter, the final output to ensure there is sufficient signal to noise ratio, we must put forward a variety of processing equipment, high signal to noise ratio requirements. In other words, the same coverage, the digital television significant savings in transmission power. Analog signals in the gradual accumulation of noise transmission, while digital signal during transmission of the basic no new noise, signal to noise ratio remains unchanged. 2, easy to implement signal storage, and storage time has nothing to do with the signal characteristics The rapid development of large scale integrated circuit technology to the semiconductor memory can store multi-frame television signal, thus completing the use of simulation technology can not reach the processing. 3, digital television uses data compression technology, easy to implement a computer network or the Internet, networks, telecommunications networks are moving toward integration, constitute a class of multi-media communication system, a future national information infrastructure, an important part. Three networks is the trend toward integration, but also the full realization of true sharing of information resources, the key to avoid duplication. 4, digital technology allows time-division multiplexing, full use of channel capacity, the use of digital television signals in the horizontal and vertical blanking time, to achieve the text multiple broadcast (easy digital conversion, as the map, text, sound, data and Mao's integrated services digital network opens up vast areas of application). 5, the compressed digital television signal by digital modulation, it can carry out various forms of high-quality broadcasting. The service area of viewers will be great probability of achieving "no error to accept," the television to watch as the quality of sound is very close to studio quality. Digital TV can also achieve high-quality mobile reception. 6, with the openness and compatibility. Through the set-top box or cable modem can receive and return the analog signal, under the system changes the analog NTSC, PAL, SECAM TV system can not exchange the properties. 7, it is reasonable to use various types of spectrum resources. To terrestrial broadcasting, for example, digital TV can enable analog TV's "disable channel", but in the future be able to use the "single frequency network (SFN)" technology, such as a set of TV programs only use a digital TV channels with national coverage while. 8, in the synchronous transfer mode (STM) communications networks, enabling a variety of business, "dynamic combination." For example, in digital high definition television, image detail is often less time there, this time because the compressed image data amount is less, can be inserted into other businesses (such as television program guide, fax, video game software etc.), without having to insert a large number of meaningless "fill bits." 9, very easy to implement password measures, that is, encryption / decryption and processing / interference, ease of professional applications (including military) and the application of data broadcasting services. In particular, to carry out various types of conditional access charges for business, this is an important value-added point of digital TV, digital TV is able to rapidly rolling development. 10, is scalable, can be divided into polar and interoperability, facilitate the communication channel in particular, various types of asynchronous transfer mode (ATM) communication network, China Unicom is also easy with the computer network. 11, to change the way people accept television. Such as the production of interactive TV applications for the television has broken new ground. Interactive TV / video on demand and let people watch while high-definition television, you can enjoy the "TV director or television editing," the fun, you can stay at home to watch high-definition movies (of course paid). 12, the emergence of digital television information appliances will dramatically change the market structure. Currently, analog television sets in addition to other irrational industrial structure, it is important or because of their relatively low technical content, resulting in the rapid development of electronic products in the market competition at a disadvantage. The expansion of digital television to promote the TV screen, higher resolution and development of wide area, and to improve the attitude of the new type TV sales price. The e-commerce company in China offers quality products such as flexible pcb board Manufacturer , making pcb boards Manufacturer, and more. For more , please visit flexible pcb board today!
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