The hospital cable TV digital front-end transformation system improves the high-definition picture quality of the cable TV system through the optimization and integration of program source access and the digital transformation of the computer room front-end. The system adopts advanced DTMB/DVB-C digital multimedia broadcasting technology with strong resistance to multi-path interference, completely eliminating video phenomena such as streaks and noise that seriously affect the look and feel, and completely eliminating poor sound quality caused by superimposed interference during the transmission process. The high-definition picture quality and CD-level sound quality bring doctors and patients a perfect viewing experience. The system retains the use of original coaxial cables or HFC optical-electrical hybrid transmission lines, and high-definition transformation can be achieved without re-laying cables. Compared with analog TV systems and one-box-one-box TV systems, this system has multiple technical, management and economic advantages.
2. Advantages of the hospital cable TV digital front-end transformation system
1. The equipment is installed centrally in the computer room, making maintenance and management very convenient;
2. The program source can be Free selection, addition or deletion, supporting access to multiple program sources such as local cable, self-run programs, satellite programs, event live broadcasts;
3. There is no repetitive investment in system upgrades and expansions, and the system is modular Installation will not affect the viewing of the original TV during system upgrades, expansion and maintenance;
4. Reduces operating costs, no need to configure a set-top box for each TV (applicable to TVs with DTMB input after 2014) interface TV), you only need to apply for a few optical modems in the computer room (depending on the number of transmitted programs), which greatly reduces the number of cable TV accounts;
5. Use the remote control that comes with the TV You can choose to watch programs, which is easy to operate, use and manage;
6. There is no need to modify the existing coaxial cables or HFC photoelectric hybrid distribution network, and the original decoration structure and facility layout of the hospital will not be changed. Not only will the construction reduce It reduces costs and facilitates maintenance;
7. The number of TVs in the hospital distribution network can be flexibly expanded, and the system can be connected to the nearest system without re-laying cables to the computer room;
8. System The construction period is short and it operates independently, which does not affect the normal business activities of the hospital and the normal operation of other facilities and equipment.
3. Principle of hospital cable TV digital front-end transformation system
1. Clear digital transmission image: using advanced terrestrial digital multimedia broadcasting technology, using MPEG-2 Part 2 and H.264 Video encoding formats, AC3, MP2 and DRA are used as audio encoding formats. The entire process of signal source, encoding equipment, mixing equipment, signal transmission and signal reception adopts digital transmission mode. The image is clear and the sound quality is beautiful, especially suitable for the use of currently popular large screens. LCD TV viewing.
2. Utilize the original TV lines: the coaxial cable distribution network and the HFC photoelectric hybrid transmission network are 0-1000MHz radio frequency signal broadband transmission networks, which can transmit both analog and digital TV signals. The digital front-end transformation of hospital cable TV only requires the transformation of the front-end of the computer room. There is no need to replace the transmission lines, which simplifies the system transformation process and shortens the system transformation period.
3. Compatible with multiple program access: The system is compatible with the access of multiple program sources. It can access local cable TV programs through optical modems of China Mobile, China Telecom, and China Unicom, and can also access local cable TV programs through professional receiving equipment and The downconverter receives satellite TV programs, and can also access high-definition self-produced TV programs through a Blu-ray high-definition player or computer. It can also output high-definition video through the camera for live broadcast of medical lectures and diagnosis and treatment activities.
4. Narrowband transmission channel expansion: Analog TV’s 8MHz bandwidth can only transmit one set of TV programs, while digital TV’s 8MHz bandwidth can transmit 4 sets of high-definition TV programs and 8 sets of standard-definition TV programs. TV show. It can be said that the frequency band used by digital TV programs is narrower, which is conducive to channel expansion. Digital TV transmission of hundreds of channels is not a problem and can fully meet the diverse needs of various hospitals.
5. Digital encoding has strong anti-interference: When watching analog TV signals, you often encounter phenomena such as streaks and noise in the image, or the sound is not clean and has crackling noise. This is all caused by signal modulation. It is caused by the superposition of interference signals during the terminal and transmission process, resulting in signal-to-noise ratio imbalance.
DTMB digital multimedia broadcasting has good anti-multipath interference capabilities and completely eliminates the interference problems existing in analog TV transmission.
6. Economical, practical and cost-effective: Since there is no need to replace the system transmission line, only the front end can be modified, which greatly saves system modification costs and reduces system modification time. While ensuring that this system is advanced and scientific and will not be outdated in five years, it fully takes into account the existing cable TV transmission environment of various hospitals and provides a very economical solution for transformation and upgrading.