CN1311686C - Fibre-optical network terminal conversion transmission system for figital TV. signal - Google Patents
Fibre-optical network terminal conversion transmission system for figital TV. signal Download PDFInfo
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- CN1311686C CN1311686C CNB2005100182903A CN200510018290A CN1311686C CN 1311686 C CN1311686 C CN 1311686C CN B2005100182903 A CNB2005100182903 A CN B2005100182903A CN 200510018290 A CN200510018290 A CN 200510018290A CN 1311686 C CN1311686 C CN 1311686C
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Abstract
The present invention relates to a fiber-optical network terminal conversion transmission system for a digital television signal, which comprises an optical receiver, a multiplex divider, a decode modulating part, a balance blender and an optical transmitter, wherein the optical receiver is connected with the input end of the decode modulating part by the multiplex divider, the output end of the decode modulating part is connected with the input end of the optical transmitter by the balance blender, and the output end of the optical transmitter is connected with a user appliance by a passive optical network. The fiber-optical network terminal conversion transmission system for a digital television signal has the advantages that the digital television signal is transmitted to all the users in the whole range by the passive optical network, and the fiber-optical network terminal conversion transmission system for a digital television signal can ensure that the digital television signal with high quality is transmitted to each user terminal; the users do not need to arrange set top boxes on each television, an optical network unit can be used for a plurality of televisions, and the fiber-optical network terminal conversion transmission system for a digital television signal has simple and convenient use and saves appliance arranged cost; a fiber-optical network technology is adopted, the advantages and the characteristics of fiber-optical transmission can be fully utilized, and a platform with a limitless utilizing space can be also provided.
Description
Technical field
The present invention relates to the terminal conversion transmission system that a kind of network that adopts that Fiber to the home carries out digital television signal.
Background technology
Digital to television can be the user multichannel, high-quality rating program is provided in the cable TV.Existing digital television signal be by radio frequency coaxial-cable (except that trunk with the optical fiber) through distribution at different levels, transfer to the place near user's television set, go out the required signal of television set A/V mouth by rf digital signal being carried out demodulating and decoding again, to finish the signal transmission for the set-top box of television set configuration.
Because a set-top box is only used for a television set, a subscriber household then need dispose many set-top box if any multiple TV set, and this is not only loaded down with trivial details, and has increased user's financial burden, thereby has also influenced the rapid popularization of Digital Television.
Summary of the invention
Technical problem to be solved by this invention is the deficiency that exists at above-mentioned prior art and the terminal system that provides a kind of network that adopts that Fiber to the home to carry out digital television signal conversion transmission, it can guarantee the high-quality of digital television signal rating, and the user is more convenient in reception, use.
The present invention for the technical scheme that problem adopted of the above-mentioned proposition of solution is: terminal conversion transmission system includes optical receiver, the demultplexer that digital signal is separated output with radiofrequency signal, to supplied with digital signal decoding and it is reduced into the simulation video/audio signal is modulated to decode modulated part on the radio frequency again, the balanced mixer and the optical sender that are used for the synthesizing multi-path radiofrequency signal, optical receiver joins by the input of demultplexer and decode modulated part, the output of decode modulated part communicates with the input of optical sender through balanced mixer, and the output of last optical sender connects subscriber equipment by EPON.
Be that the input of optical receiver and the optical fiber of CATV (cable television network) light signal of 1310nm wavelength (1550 or) are joined when the present invention uses, convert the TV light signal that receives to the signal of telecommunication, by demultplexer signal allocation is gone out multichannel, wherein digital television signal partly is connected with demodulating and decoding, digital electric signal is reduced into the A/V video/audio signal of simulation, being modulated to can be on the multiplex radiofrequency signal again, by balanced mixer multi-channel rf signal (containing the anolog TV signals among the CATV) is synthesized, the multichannel analog electrical signal after optical sender will synthesize converts the light signal of the required 1550nm wavelength of EPON to.The 1310/1490nm wavelength light signal that amplifies again with broadband, phonological component through power amplifier in network closes ripple (wavelength division multiplexing), after optical splitter beam split and be sent to optical network unit (ONU) in the user family with EPON (PON) mode single fiber.The wavelength division multiplexing that the ONU unit provides passive optical network closes the ripple Signal Separation and goes out 1550nm radio frequency light signal and convert the multi-channel rf analog electrical signal to, uses for multiple TV set.
Beneficial effect of the present invention is: 1, digital television signal advanceed on the headend equipment of central machine room, carry out the demodulating and decoding descrambling, solve the A/V signal and be modulated to radio frequency again, whole process is delivered to all users with EPON, can guarantee that the digital television signal high quality transmission is to user terminal.Experiment test result of the present invention meets " national radio, TV and film industries standard (GY/T106-1999); Need not when 2, the user uses at every television set configuration machine top box, an optical network unit can use for multiple TV set, and is not only easy to use, and saved the equipment disposition expense; 3, the technology that adopts that Fiber to the home, can make full use of that the optical fiber information capacity is huge, sending allowance is extremely low, be not afraid of characteristics such as interference, good confidentiality, Fiber to the home, and network has not only transmitted broadband, voice and cable TV signal, and simultaneously, also can provide one has the platform that infinitely utilizes the space.Because the transmission characteristic of optical fiber has ensured that undistorted, the glitch-free high-quality of radiofrequency signal transmits.
Description of drawings
Fig. 1 is the system architecture diagram of one embodiment of the invention.
Embodiment
Further specify embodiments of the invention below in conjunction with accompanying drawing, include optical receiver, demultplexer, decode modulated part, balanced mixer and optical sender.The optical fiber of the input of optical receiver and CATV (cable television network) light signal of 1310nm wavelength (1550 or) joins, optical receiver joins by the input of demultplexer and decode modulated part, described decode modulated comprises partly that decoding descrambler and modulator are connected in series mutually and forms, decoding descrambler and modulator can be provided with (1,2 ... N) many, this will decide the demand of content of TV program on the user, but present in theory all digital programs of demodulation.The function of decoding descrambler is that the Digital Television signal of telecommunication that will change becomes the A/V video/audio signal, the function of modulator is the A/V video/audio signal to be modulated into can supply multiplex radiofrequency signal, and the output of decode modulated part communicates with the input of optical sender through balanced mixer.For preventing the extraneous signal interference of (comprising that the CATV analog program changes suddenly), guarantee normal, the stable operation of system, can between demultplexer and balanced mixer, be connected low pass filter, and will pass under the required analog radio frequency TV programme.The output of optical sender closes ripple (wavelength division multiplexing) through the 1310/1490nm wavelength light signal that power amplifier amplifies with broadband, phonological component again, after optical splitter beam split and be sent to optical network unit (ONU) in each user family with EPON (PON) mode single fiber.The optical splitter splitting ratio can be selected (as 1: 32) on demand.The light signal of the wavelength division multiplexing that optical network unit provides system separately, wherein a part converts the multi-channel rf TV signal to, uses for multiple TV set.For enlarging the TV programme signal source, also can set up adjunction satellite digital (TV) receiver, the satellite television digital receiver connects modulator, and modulator and balanced mixer join.
All devices of the present invention can be chosen or be ordered by market, and it is convenient to make preparation.The type selecting of each equipment and Acceptance Test all should meet " national radio, TV and film industries standard ", to guarantee the qualified of system index.
The selection of demodulating and decoding descrambling equipment of the present invention will be decided according to the development and change of market Digital Television demodulate reception equipment and demultiplexing decoding chip integrated level.
Claims (5)
1, the terminal of digital television signal conversion transmission system in a kind of Fiber to the home network, it is characterized in that including optical receiver, the demultplexer that digital signal is separated output with radiofrequency signal, to supplied with digital signal decoding and it is reduced into the simulation video/audio signal is modulated to decode modulated part on the radio frequency again, the balanced mixer and the optical sender that are used for the synthesizing multi-path radiofrequency signal, optical receiver joins by the input of demultplexer and decode modulated part, the output of decode modulated part communicates with the input of optical sender through balanced mixer, and the output of last optical sender connects subscriber equipment by EPON.
2, terminal conversion transmission system by digital television signal in described Fiber to the home the network of claim 1, it is characterized in that the input of optical receiver and the optical fiber of cable television network join, convert the TV light signal that receives to the signal of telecommunication, by demultplexer signal allocation is gone out multichannel, wherein digital television signal partly is connected with demodulating and decoding, digital electric signal is reduced into the A/V video/audio signal of simulation, being modulated to can be on the multiplex radiofrequency signal again, by balanced mixer the multi-channel rf signal is synthesized, multichannel analog electrical signal after optical sender will synthesize converts the light signal of the required 1550nm wavelength of EPON to, in network, amplify again and the broadband through power amplifier, the 1310/1490nm wavelength light signal of phonological component closes ripple, after the optical splitter beam split, and be sent to optical network unit in the user family with EPON mode single fiber.
3,, it is characterized in that described decode modulated comprises partly that decoding descrambler and modulator are connected in series mutually and forms by the terminal conversion transmission system of digital television signal in claim 1 or 2 described Fiber to the home the networks.
4,, it is characterized in that between demultplexer and balanced mixer, being connected low pass filter by the terminal conversion transmission system of digital television signal in claim 1 or 2 described Fiber to the home the networks.
5, by the terminal conversion transmission system of digital television signal in claim 1 or 2 described Fiber to the home the networks, it is characterized in that setting up adjunction satellite digital receiver, the satellite television digital receiver connects modulator, and modulator and balanced mixer join.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100182903A CN1311686C (en) | 2005-02-21 | 2005-02-21 | Fibre-optical network terminal conversion transmission system for figital TV. signal |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100182903A CN1311686C (en) | 2005-02-21 | 2005-02-21 | Fibre-optical network terminal conversion transmission system for figital TV. signal |
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| CN1658671A CN1658671A (en) | 2005-08-24 |
| CN1311686C true CN1311686C (en) | 2007-04-18 |
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| CNB2005100182903A Active CN1311686C (en) | 2005-02-21 | 2005-02-21 | Fibre-optical network terminal conversion transmission system for figital TV. signal |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100461856C (en) * | 2006-05-23 | 2009-02-11 | 长飞光纤光缆有限公司 | Open type decoding multiplexing system in full frequencies in digital TV |
| CN101516026B (en) * | 2008-02-22 | 2010-10-13 | 何明峰 | Optical fiber signal mixer and optical fiber video monitoring system |
| CN102201866A (en) * | 2011-06-08 | 2011-09-28 | 深圳日海通讯技术股份有限公司 | Method for directly transmitting optical signals to user equipment |
| CN104320191A (en) * | 2014-10-15 | 2015-01-28 | 成都广达电子股份有限公司 | Multiservice access system and multiservice access method based on optical fiber communications |
| CN106230675A (en) * | 2016-09-18 | 2016-12-14 | 北京中经赛博科技有限公司 | A kind of integration of three networks access management system and control method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08331053A (en) * | 1995-06-02 | 1996-12-13 | Matsushita Electric Ind Co Ltd | Optical wireless data transmitter |
| WO2002032019A1 (en) * | 2000-10-06 | 2002-04-18 | Board Of Regents | Optical communications by frequency content of femtosecond laser pulses |
| US20020075547A1 (en) * | 2000-12-15 | 2002-06-20 | Alex Mashinsky | High-speed optical data network with improved optical receiver |
| CN2520074Y (en) * | 2001-11-17 | 2002-11-06 | 中国科学技术大学 | Polymer optical fibre communication convertor |
| WO2005008923A2 (en) * | 2003-07-16 | 2005-01-27 | Nippon Telegraph & Telephone | Optical communication system using optical frequency code, optical transmission device and optical reception device thereof, and reflection type optical communication device |
-
2005
- 2005-02-21 CN CNB2005100182903A patent/CN1311686C/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08331053A (en) * | 1995-06-02 | 1996-12-13 | Matsushita Electric Ind Co Ltd | Optical wireless data transmitter |
| WO2002032019A1 (en) * | 2000-10-06 | 2002-04-18 | Board Of Regents | Optical communications by frequency content of femtosecond laser pulses |
| US20020075547A1 (en) * | 2000-12-15 | 2002-06-20 | Alex Mashinsky | High-speed optical data network with improved optical receiver |
| CN2520074Y (en) * | 2001-11-17 | 2002-11-06 | 中国科学技术大学 | Polymer optical fibre communication convertor |
| WO2005008923A2 (en) * | 2003-07-16 | 2005-01-27 | Nippon Telegraph & Telephone | Optical communication system using optical frequency code, optical transmission device and optical reception device thereof, and reflection type optical communication device |
Non-Patent Citations (1)
| Title |
|---|
| 数字CATV光纤超干线传输 胡台光，光纤与电缆及其应用技术，第3期 1997 * |
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Owner name: WUHAN CHANGGUANG TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: CHANGFEI OPTICAL FIBER AND OPTICAL CABLE CO., LTD. Effective date: 20080111 |
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Effective date of registration: 20080111 Address after: Hubei city of Wuhan province Wuchang two Guanshan Road No. four Patentee after: Wuhan Yangtze Optical Technology Co., Ltd. Address before: Hubei city of Wuhan province Wuchang two Guanshan Road No. four Patentee before: Changfei Fibre-Optical & Optical Cable Co., Ltd. |