CN201256432Y - Terrestrial digital television transmission system based on cabled television optical fiber network - Google Patents
Terrestrial digital television transmission system based on cabled television optical fiber network Download PDFInfo
- Publication number
- CN201256432Y CN201256432Y CNU2008201032438U CN200820103243U CN201256432Y CN 201256432 Y CN201256432 Y CN 201256432Y CN U2008201032438 U CNU2008201032438 U CN U2008201032438U CN 200820103243 U CN200820103243 U CN 200820103243U CN 201256432 Y CN201256432 Y CN 201256432Y
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- cable
- fiber optic
- optic network
- digital television
- television
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Abstract
Disclosed is a ground surface digital television transmission system based on cable television optical fiber network, wherein the front end of a proximal end optical terminal set in the existing cable television optical fiber network is added with a combiner, and the rear end of each far-end optical terminal set is connected with a digital television common-frequency amplifier. Cable television signals and ground surface television signals are combined to enter the proximal end optical terminal set at the front end of the system, and are transmitted to the far-end optical terminal set through an optical fiber network, ground surface television signals are reduced through the far-end optical terminal set in the areas needing television signals, cable television signals are filtered through the digital television common-frequency amplifier, and the common-frequency of the ground surface television signals are covered after amplifying. The ground surface digital television transmission system has the advantages of completely using original CATV optical fiber network and greatly saving the investment and later maintenance and administration expenses.
Description
[technical field]
The utility model is about a kind of ground digital TV transmission system, particularly relates to a kind of ground digital TV transmission system based on the cable TV fiber optic network.
[background technology]
General ground digital TV broadcasting network all is the antenna emitting radio wave covering TV user by TV station's commanding elevation high-power transmitter, client is by reception antenna and television set rating program, and this kind method can be carried out large-area terrestrial television signal effectively and be covered.But mountain area that some are more remote and villages and small towns are too far away from transmitter centre-to-centre spacing, signal very a little less than, some the area in addition without any signal.
Simultaneously, the Cable Network network is because some mountain area and villages and small towns all too are far away, even after can't arriving or arrive, expensive big and maintenance cost is higher, operational administrative be quite inconvenient.
[utility model content]
Technical problem to be solved in the utility model is to provide a kind of ground digital TV transmission system based on the cable TV fiber optic network, can effectively solve the covering problem in remote mountain areas and villages and small towns.
The utility model solves the problems of the technologies described above by the following technical programs: a kind of ground digital TV transmission system based on the cable TV fiber optic network, comprise cable TV fiber optic network, mixer, and the same audio amplifier of Digital Television, front end at the near-end optical transceiver of described cable TV fiber optic network adds described mixer, and connects the same audio amplifier of described Digital Television in the rear end of each far-end optical transceiver of described cable TV fiber optic network.
This utility model can further be specially:
Described Digital Television comprises prime filter, numerical-control attenuator, power amplifier, back level filter, power-supply system, supervisory control system, modulator-demodulator and transmitting antenna with audio amplifier, the input of prime filter connects the far-end optical transceiver of cable TV fiber optic network, output is connected with the input of numerical-control attenuator, the output of numerical-control attenuator connects the input of power amplifier, and the output of power amplifier is connected to transmitting antenna by back level filter; The power supply terminal of power-supply system is connected to numerical-control attenuator, power amplifier and supervisory control system; The I/O port of supervisory control system is connected to the I/O port of numerical-control attenuator and power amplifier, and the communication interface of supervisory control system is connected to modulator-demodulator.
After closing the road with cable TV signal and terrestrial television signal through mixer, system front end enters the near-end optical transceiver, be transferred to the far-end optical transceiver through the cable TV fiber optic network, in the zone that needs terrestrial television signal, restore terrestrial television signal by the far-end optical transceiver, after amplifying frequently, cover with audio amplifier elimination cable TV signal and with terrestrial television signal by Digital Television again.
The utility model is based on the advantage of the ground digital TV transmission system of cable TV fiber optic network: utilize original CATV (Cable TV fully, cable TV) fiber optic network, only need to add a mixer, saved the investment and the maintenance management expense in later stage greatly at near-end optical transceiver front end.And this Digital Television has automated power control with audio amplifier, the function of automatic gain control; Wide frequency ranges, ultra linear solid-state power amplifier guarantees the stability of output; Have remote monitoring function, simple and convenient operation and maintenance can realize centralized management; Adopt windproofly, rainproof, the outdoor type of anti-thunderbolt guarantees the reliability of equipment.
[description of drawings]
The utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the terrestrial television transmission system total theory diagram of the utility model based on the cable TV fiber optic network.
Fig. 2 be among Fig. 1 Digital Television with the connection and the theory diagram of audio amplifier.
Among the figure: 10. cable TV fiber optic network, 20. mixers, 30. same audio amplifiers, 12. near-end optical transceiver, 14. the far-end optical transceiver, 31. prime filters, 32. numerical-control attenuators, 33. power amplifier, 34. back level filter, 35. transmitting antennas, 36. power-supply systems, 37. supervisory control system, 38. modulator-demodulators.
[embodiment]
See also Fig. 1, the utility model comprises cable TV fiber optic network 10, mixer 20 based on the terrestrial television transmission system of cable TV fiber optic network, and Digital Television is with audio amplifier 30.
This cable TV fiber optic network 10 adopts existing cable TV (CATV) fiber optic network fully, front end at the near-end optical transceiver 12 of this cable TV fiber optic network 10 adds described mixer 20, and connects described Digital Television with audio amplifier 30 in the rear end of each far-end optical transceiver 14 of this cable TV fiber optic network 10.
Front end signal transmission based on the terrestrial television transmission system of cable TV fiber optic network is as described below: cable TV signal and terrestrial television signal enter near-end optical transceiver 12 after closing the road through mixer 20, be transferred to far-end optical transceiver 14 by cable TV fiber optic network 10, restore terrestrial television signal through far-end optical transceiver 14, pass through Digital Television then with audio amplifier 30 elimination cable TV signals, and will cover after the same frequency amplification of terrestrial television signal, in Fig. 1, cover A town, B town respectively, and the C town.In addition, the cable TV signal that restores through far-end optical transceiver 14 can be directly by wired user of receiving place to use, as the A town among Fig. 1, B town, and the C town.
Consult Fig. 2, the utility model comprises prime filter 31 based on the terminal Digital Television of the terrestrial television transmission system of cable TV fiber optic network with audio amplifier 30, numerical-control attenuator 32, power amplifier 33, back level filter 34, power-supply system 36, supervisory control system 37, modulator-demodulator (Modem) 38 and transmitting antenna 35, the input of prime filter 31 connects the far-end optical transceiver 14 of cable TV fiber optic network 10, output is connected with the input of numerical-control attenuator 32, the output of numerical-control attenuator 32 connects the input of power amplifier 33, the output of power amplifier 33 is connected to transmitting antenna 35 by back level filter 34, launches; The power supply terminal of power-supply system 36 is connected to numerical-control attenuator 32, power amplifier 33 and supervisory control system 37, is its power supply; The I/O mouth that the I/O of supervisory control system 37 (I/O) mouth is connected to numerical-control attenuator 32, power amplifier 33 carries out the control of reading of data and state, and its communication interface is connected to modulator-demodulator 38 to carry out the transmitting-receiving of note.
This Digital Television is as described below with audio amplifier 30 operation principles: the terrestrial television signal after far-end optical transceiver 14 restores is through prime filter 31 elimination cable TV signals, after process digital pad 32 carries out automatic gain control, undertaken with amplifying output frequently, through covering to the zone that needs terrestrial DTV by transmitting antenna 35 after 34 filtering of level filter later by wide region, high linear solid-state power amplifier 33.Power-supply system 36 is each module for power supply in the equipment, and the state of supervisory control system 37 control modules is responsible for the transmitting-receiving reporting equipment information of modulator-demodulator 38 notes simultaneously.
Claims (2)
1. ground digital TV transmission system based on the cable TV fiber optic network, it is characterized in that: comprise cable TV fiber optic network, mixer, and the same audio amplifier of Digital Television, front end at the near-end optical transceiver of described cable TV fiber optic network adds described mixer, and connects the same audio amplifier of described Digital Television in the rear end of each far-end optical transceiver of described cable TV fiber optic network.
2. the ground digital TV transmission system based on the cable TV fiber optic network as claimed in claim 1, it is characterized in that: described Digital Television comprises the prime filter with audio amplifier, numerical-control attenuator, power amplifier, back level filter, power-supply system, supervisory control system, modulator-demodulator and transmitting antenna, the input of prime filter connects the far-end optical transceiver of cable TV fiber optic network, output is connected with the input of numerical-control attenuator, the output of numerical-control attenuator connects the input of power amplifier, and the output of power amplifier is connected to transmitting antenna by back level filter; The power supply terminal of power-supply system is connected to numerical-control attenuator, power amplifier and supervisory control system; The I/O port of supervisory control system is connected to the I/O port of numerical-control attenuator and power amplifier, and the communication interface of supervisory control system is connected to modulator-demodulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201032438U CN201256432Y (en) | 2008-07-30 | 2008-07-30 | Terrestrial digital television transmission system based on cabled television optical fiber network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201032438U CN201256432Y (en) | 2008-07-30 | 2008-07-30 | Terrestrial digital television transmission system based on cabled television optical fiber network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201256432Y true CN201256432Y (en) | 2009-06-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201032438U Expired - Fee Related CN201256432Y (en) | 2008-07-30 | 2008-07-30 | Terrestrial digital television transmission system based on cabled television optical fiber network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201256432Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102984466A (en) * | 2011-09-06 | 2013-03-20 | 上海东方明珠广播电视研究发展有限公司 | A system and a method for terrestrial-cable transition |
| CN107371070A (en) * | 2017-07-21 | 2017-11-21 | 广州珠江移动多媒体信息有限公司 | A kind of method that digital television signal mends point optimization covering |
-
2008
- 2008-07-30 CN CNU2008201032438U patent/CN201256432Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102984466A (en) * | 2011-09-06 | 2013-03-20 | 上海东方明珠广播电视研究发展有限公司 | A system and a method for terrestrial-cable transition |
| CN102984466B (en) * | 2011-09-06 | 2015-05-06 | 上海东方明珠广播电视研究发展有限公司 | A system and a method for terrestrial-cable transition |
| CN107371070A (en) * | 2017-07-21 | 2017-11-21 | 广州珠江移动多媒体信息有限公司 | A kind of method that digital television signal mends point optimization covering |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090610 Termination date: 20130730 |