The digital TV integrated machine is capable of directly receiving and playing high-definition program signals under the action of the built-in high-frequency head, realizing the "full-range digital" video and audio processing, and avoiding the quality loss of the high-definition signal during transmission and conversion. Under the premise of terrestrial high-definition digital TV program signal transmission, viewers can directly view the high-definition digital TV program by turning on the TV, which is considered to be a true digital TV.
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The digital TV all-in-one has the following advantages:
1, the quality of signal processing and transmission is determined by the source
Because the digital device only outputs two levels of 1 and 0, the size is not recovered when recovering, so the signal is stable and strong against interference, which is very suitable for long-distance digital transmission. After the digital signal enters the clutter in multiple processing and transmission, its clutter amplitude does not exceed a certain rated level and can be cleared by digital regeneration; even if the introduced clutter amplitude exceeds the rated value, resulting in a bit error, it can be introduced. The error correction coding technique of the channel is corrected at the receiving end. Therefore, the digital transmission does not reduce the signal-to-noise ratio, avoids the influence of the system's non-linear distortion, and greatly improves the image quality. In analog systems, non-linear distortion can cause significant image damage, such as phase distortion caused by non-linear distortion. In the processing and transmission of analog signals, new clutter can be introduced each time. In order to ensure sufficient signal-to-noise ratio of the final output, high signal-to-noise ratio requirements must be imposed on various processing devices. In other words, digital TV greatly saves transmission power under the same coverage area. The analog signal gradually accumulates during the transmission process, while the digital signal does not generate new noise during the transmission process, and the signal-to-noise ratio is basically unchanged.
2, easy to achieve signal storage, and storage time is independent of the characteristics of the signal
The rapid development of large-scale integrated circuit technology enables semiconductor memories to store multi-frame television signals, thereby completing processing functions that are impossible with analog technology.
3. Digital TV adopts data compression technology, which facilitates the integration of computer network or Internet, TV network and telecommunication network, and constitutes a kind of multimedia communication system, which becomes an important part of future national information infrastructure. The integration of the three networks is the trend of the times, and it is also the key to fully realize the sharing of information resources in the true sense and avoid redundant construction.
4. Digital technology can realize time division and multipath, make full use of channel capacity, and realize line multiplex broadcast by using line and field blanking time in digital television signals (easy to realize digital transformation, which is a combination of picture, text, sound and data) The business digital network has opened up a wide range of applications.
5. The digital TV signal after compression can be digitally modulated to perform various forms of high quality broadcasting. The audience in the service area will achieve “no error acceptance†with great probability, and the quality of the TV sound image received is very close to the quality of the studio. Digital TV also enables high quality mobile acceptance.
6, open and compatible. The analog receiving and returning signals can be realized by the set top box or the cable modem, and the characteristics that the NTSC, PAL, and SECAM television programs cannot be exchanged under the analog system are changed.
7. Various types of spectrum resources can be reasonably utilized. In the case of terrestrial broadcasting, digital television can enable "disabled channels" for analog television, and in the future, "single frequency network (SFN)" technology can be used. For example, a set of television programs only occupy the same digital television channel and cover the whole country.
8. In the synchronous transfer mode (STM) communication network, "dynamic combination" of multiple services can be realized. For example, in digital high-definition television programs, there are often times when the image details are less, and since the amount of compressed image data is small, other services (such as television program guides, faxes, and electronic game software) can be inserted. Etc.) without having to insert a lot of meaningless "fill bits".
9. It is easy to implement password measures, namely encryption/decryption and addition/interference, to facilitate the application of professional applications (including military) and data broadcasting services. In particular, it is a major value-added point for digital TV, and it is also the basis for the rapid development of digital TV.
10. It is scalable, divisible and interoperable, easy to spread in various communication channels, especially asynchronous transfer mode (ATM) networks, and easy to communicate with computer networks.
11. Change the way people accept TV. For example, the generation of interactive TV has opened up a new world for the application of television. Interactive TV/video on demand enables people to enjoy the "TV director or TV editor" while watching high-definition TV, and can watch high-definition movies without paying at home (of course, paid).
12. The emergence of digital TV will also greatly change the market structure of information appliances. At present, in addition to the unreasonable industrial structure of analog TV sets, the important thing is that due to its relatively low technical content, it is at a disadvantage in the rapidly developing electronic product market competition. Digital TV can promote the TV to expand the picture, increase the resolution and widen the screen, and increase the sales price with the attitude of the new TV.
Hydraulic pump
Hydraulic motor
The hydraulic cylinder
Hydraulic valve
The supercharger
All components used in hydraulic systems.
Can be divided into:
Power components, such as hydraulic pumps.
Control components, such as relief valve, sequence valve, directional valve, etc.
Actuators, such as hydraulic motors, hydraulic cylinders.
Auxiliary parts, such as: fuel tank, pipeline, etc.
Hydraulic system: is composed of a variety of hydraulic components, auxiliary components, the components are distributed in each part of the equipment, they are organically connected by the pipeline, pipe joints, connectors and other parts can independently complete a variety of working conditions of the system.
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