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Campus Digital TV to Analog

  • Categories:Service support
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  • Time of issue:2019-12-30
  • Views:1

(Summary description)Multiple television signals modulated to different frequency bands are output to an adjacent frequency mixer for frequency division multiplexing, amplified by a mains amplifier, output to the school's original closed-circuit television network, transmitted to the school television, and controlled for viewing by remote control.

Campus Digital TV to Analog

(Summary description)Multiple television signals modulated to different frequency bands are output to an adjacent frequency mixer for frequency division multiplexing, amplified by a mains amplifier, output to the school's original closed-circuit television network, transmitted to the school television, and controlled for viewing by remote control.

  • Categories:Service support
  • Author:
  • Origin:
  • Time of issue:2019-12-30
  • Views:1
Information
I. Necessity of building digital TV to analog system on campus
In recent years, as people's thirst for high-definition television signals, digital television has flourished, completely abandoning the phenomenon of netting, snowflakes, and noise in analog TV watching programs, making people feel the fruits of digital transmission of information.
For schools that teach and educate people, the closed-circuit television system is an important carrier for teachers and students to understand domestic and foreign news, watch movies, television, and entertainment programs. The quality of their television signals is very important for the school's reputation and the mood of teachers and students . In order to meet the needs of passengers watching high-definition television signals, most schools have gradually built digital television systems. However, if TV sets are added to the set-top box, not only will it cost a lot of money to purchase a large number of set-top boxes, but also the annual viewing fee is not a small expense, which is a headache for school operators. For this reason, how to build a digital television viewing system that can receive high-definition television signals and save viewing costs has become an urgent problem for school operators.
Beijing Hiteway Technology Co., Ltd. (http://www.hyteway.com 010-86891733), as a domestic professional radio and television industry supplier, has set up a special unit with the United States, the Chinese Academy of Sciences and other scientific research units to address the digital TV viewing problems facing the school industry. The research group carried out in-depth investigation, research, development and design, and took the lead in constructing a campus digital TV-to-analog system integrating "economic, scientific, and practical" in China. This platform has the characteristics of simple construction, good performance and low price, and economical and practical. It is the first choice for campus digital TV to analog system.
Design Basis of Campus Digital TV to Analog System
    The campus digital TV to analog system solution was designed in strict accordance with relevant national standards and industry specifications. The main basis is as follows:
    ØGB50200—94 "Technical Specifications for Cable TV System Engineering"
    ØGB6510—1996 "Cable Distribution System for TV and Sound Signals"
    ØGB11318—89 《30MHz-1GHz sound and TV signal cable distribution system equipment and components》
    ØGY / T106—92 "Technical Specifications for Cable Television Broadcasting System"
    ØGY / T118—1995 "Technical Requirements for Co-Cable Transmission System for Cable TV and Cable Broadcasting"
    Guangfa Jizi [1993], Radio, Film and Television Department [1993] "Opinions on the Current Network Technology System of Cable TV"
Design Principles of Campus Digital TV to Analog System
For the design of campus digital TV to analog system, Hite Wai Yip adheres to the principle of "advanced, scientific, economical and practical" to create a clear and stylish digital TV to analog system platform.
Advanced: Campus digital TV to analog system uses the most advanced digital signal multi-channel demodulation technology at home and abroad, RF high-frequency modulation technology, etc., to ensure that the digital TV to analog system signal is clear.
Scientific: Campus digital television to analog system uses high-reliability intermediate frequency residual sideband SAW filters, multiple phase-locking methods, etc., to scientifically control the degree of suppression, flatness, and modulation of the channel to make the channel modulation stable and reliable. Intermodulation and mutual interference do not occur.
Stability: The campus digital TV to analog system uses stable and reliable gallium arsenide radio frequency devices to ensure high carrier-to-noise ratio, high reliability and simple operation.
Economical: The economics of the campus digital TV to analog system are obvious to all. The construction and use costs are only one-tenth of the pure digital TV system, which greatly saves school expenses.
Design Principles of Campus Digital TV to Analog System
4.1 Principle of Campus Digital TV to Analog System
Normally, digital television signals intervene in schools through fiber optic cables. First, the optical cable carrying the digital television signal is connected to the optical receiver, and the digital television signal is converted from the optical signal into an RF radio frequency signal. Then, the digital television signal is multi-distributed by a distributor and input into the set-top box / digital television multi-channel. The demodulator demodulates the digital TV into standard audio and video signals; then inputs the professional adjacent frequency modulation host to modulate different TV signals to different high frequency bands; finally, it modulates multiple TV signals to different frequency bands, Output to the adjacent frequency mixer for frequency division multiplexing, amplified by the mains amplifier, output to the school's original closed-circuit television network, transmitted to the school television, and controlled by remote control.

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