CN201048446Y - Leakage cable based mobile television signal underground tunnel overlapping system - Google Patents
Leakage cable based mobile television signal underground tunnel overlapping system Download PDFInfo
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- CN201048446Y CN201048446Y CNU2007200673346U CN200720067334U CN201048446Y CN 201048446 Y CN201048446 Y CN 201048446Y CN U2007200673346 U CNU2007200673346 U CN U2007200673346U CN 200720067334 U CN200720067334 U CN 200720067334U CN 201048446 Y CN201048446 Y CN 201048446Y
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Abstract
The utility model provides a mobile TV subway tunnel covering system based on the leakage cable. The utility model includes a low noise amplifier used for amplifying the signal source to the required working electrical level of a light emitting machine; a light emitting machine used for transforming a radio frequency signal outputted by the low noise amplifier into a light signal; a first optical coupler with at least one input terminal and a plurality of output terminals used for distributing the optical power outputted by the light emitting machine into multi-channel optical power (the number of the output terminals can be set according to the actual requirement of the platforms). A plurality of light receivers connected with the output terminals of the first optical coupler through optical fiber are used for transforming the light signals into radio frequency; leakage cables connected with the light receivers are used for emitting the radio frequency signals. The utility model solves the problem that signals with different frequencies interfere with each other, adopts the combined transmission method that the digital TV directly broadcasting station cooperates with the leakage cables, lowers the construction cost of the system greatly, solves the problem that the mobile TV can be watched in subway, and meets the requirements of the railway passengers for acquiring the real-time information.
Description
Technical field
The utility model relates to the wireless digital TV-set broadcast technology, particularly ground digital television broadcast signal covering system.
Background technology
Along with the development that digital technology is maked rapid progress, the radiated television transmission technology is also progressively developed to the digitlization direction by simulation, and the applied business of wireless digital broadcasting TV emerges in an endless stream, mobile TV one of new application in this field just.Mobile TV adopts the ground digital television broadcast technology, carries out the TV programme real-time Transmission by the mode that wireless digital signal emission, ground receive, and support is moved or fixed point receives signal stabilization, clear picture.
Mobile TV has satisfied the demand that people obtain information whenever and wherever possible, and news information, variety entertainment, information on services are presented in face of the public continuously.Mobile TV has produced tremendous influence in the public in recent years, extensively be covered in bus, taxi, Vaporetto and all kinds of building, significant cultural place etc., along with the rating platform is expanded fast, mobile TV is about to move into track traffic, TV program is introduced subway train compartment and platform, make up a cover subway video-signal system.Because mobile television signal covers the overlay network that main dependence is made up of launch points such as television tower, broadcasting mansions at present, and this network only can satisfy outdoor reception requirement, can't normally receive mobile television signal in environment such as subway, tunnel.
The utility model content
For solving the reception problem of mobile television signal in subway, tunnel, the utility model provides a kind of mobile TV subway tunnel covering system based on leaky cable, watches smooth TV programme and other multimedia messagess on subway train and the platform to be implemented in.
For reaching above-mentioned purpose, the utility model adopts following technical scheme:
A kind of mobile TV subway tunnel covering system based on leaky cable comprises:
LNA is used for that signal source is amplified to light and sends out the required operation level of machine;
Light is sent out machine, is used for the radiofrequency signal of LNA output is changed into light signal;
First optical coupler with at least one input and a plurality of outputs, the luminous power that is used for described light is sent out machine output is distributed into the multichannel luminous power; Wherein output quantity can be set according to the platform actual needs.
Receive machine by a plurality of light that optical fiber links to each other with the output of described first optical coupler, be used for light signal is changed into radiofrequency signal;
Leaky cable with described light receipts machine is connected is used for emitting radio frequency signal.
As a kind of improvement of the present utility model, can comprise that also being connected in light receives repeater between machine and the described leaky cable, be used to strengthen the power output of the radiofrequency signal that described light receipts machine exports.
As another improvement of the present utility model, also comprise a plurality of second optical couplers, described second optical coupler has at least one input and a plurality of output, the input of each described second optical coupler links to each other with the output of described first optical coupler or the output of other second optical coupler by optical fiber, wherein the input of at least one described second optical coupler links to each other by the output of optical fiber with described first optical coupler, and described a plurality of light receipts machines are connected on the output of described first optical coupler or second optical coupler.
As a kind of optimal way of the present utility model, described first optical coupler and second optical coupler all have an input and two outputs.
As another optimal way of the present utility model, it is identical with the described second optical coupler quantity that described light is received machine, and each described light is received machine and all is connected on the output of described second optical coupler.
One improve as of the present utility model again, send out at described LNA and described light and also be provided with a coupler between the machine, the part level that is used for telling described LNA output extremely described light is sent out machine.
One improve as of the present utility model, an output of described coupler is connected with a repeater and leaky cable in turn again.
One improve again as of the present utility model, also comprise mixer and the mobile communication base station that is connected with the mixer input, the output of described mixer links to each other with leaky cable, described repeater is a digital television repeater, described mixer is used for electromagnetic wave signal is carried out filtering, will be sent in the described leaky cable behind digital television signal and the mobile communication signal synthetic a tunnel again.
One improve again as of the present utility model, also comprise a plurality of power splitters, be used for exporting one tunnel radiofrequency signal demultiplexing radiofrequency signal of described digital television repeater and mobile communication base station output to mixer.
The utlity model has following beneficial effect:
In the fiber-optic signal source transmitting device of the mobile television signal covering system based on leaky cable of the present utility model, radiofrequency signal is changed into light signal to be transmitted, the signal that has solved each subway station is introduced problem, and signal quality is stable, in system's construction, avoided exterior aerial to install and cable laying, greatly reduce difficulty of construction, autgmentability is strong simultaneously, can transfer signals to other platform effectively.Simultaneously, utilize existing leaky cable resource in tunnel and the subway, use the mixer that meets insulated degree requirement, make the cable transmission altogether of digital television signal and mobile communication signal, when normally watching TV program, do not influence the mobile communication call quality.
Technical solutions of the utility model satisfy the information requirement of mobile crowd in the track traffic, have solved the reception problem of digital television signal at underground simultaneously.Advantages such as the utility model is compared with other signal soverlay technique schemes, and it fully combines the device resource of mobile communication covering system, avoids overlapping construction and the wasting of resources that causes, and it is low to have an investment, and the construction period is short, and coverage effect is good.Can be implemented in and watch real-time TV program on the subway train, further enlarge wireless digital TV-set The Application of Technology scope, especially solve Intermodulation Interference, clutter interference.Signal indoor for Digital Television and underground covers the practical and effective technical scheme is provided.
Further specify the utility model below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment fiber-optic signal source hop;
Fig. 2 is the structural representation of the utility model embodiment signal He Lu cover part.
Embodiment
A kind of mobile television signal covering system based on leaky cable, comprise fiber-optic signal source hop shown in Figure 1 and signal He Lu cover part shown in Figure 2, fiber-optic signal source hop mainly is the distribution of carrying out luminous power with optical coupler, mode by Optical Fiber Transmission transmits light signal again, utilize the light receiving unit to convert light signal to radiofrequency signal at last, and send into the He Lu cover part.Signal He Lu cover part mainly is the radiofrequency signal of input to be carried out power amplification handle, use power splitter that signal is divided into four the tunnel, close the road transmission by mixer and mobile communication signal again, send into the leaky cable system at last, in subway tunnel, form the mobile television signal overlay network.It specifically comprises:
LNA is used for that signal source is amplified to light and sends out the required operation level of machine; It can adopt harmless mode of amplifying;
Coupler is used to tell the part level that described LNA is exported, to distribute to other platforms as input signal source;
Light is sent out machine, is used for the radiofrequency signal that described coupler is told is changed into light signal;
First optical coupler with an input and two outputs, the luminous power that is used for described light is sent out machine output is distributed into the multichannel luminous power;
A plurality of second optical couplers, described second optical coupler has an input and two outputs, the input of each described second optical coupler links to each other with the output of described first optical coupler or the output of other second optical coupler by optical fiber, wherein the input of at least one described second optical coupler links to each other by the output of optical fiber with described first optical coupler, and described a plurality of light receipts machines are connected on the output of described first optical coupler or second optical coupler.
Receive machine by a plurality of light that optical fiber links to each other with the output of described first optical coupler, be used for light signal is changed into radiofrequency signal; It is identical with the described second optical coupler quantity that described light is received machine, and each described light is received machine and all is connected on the output of described second optical coupler.
Receive the repeater that the output of machine is connected with described light, be used to strengthen the power output of the radiofrequency signal of described light receipts machine output.
Leaky cable with the output of described repeater is connected is used for emitting radio frequency signal.
Wherein, also comprise and the direct-connected repeater of described coupler, be used to strengthen the power output of the radiofrequency signal that described coupler do not tell.
Wherein, also comprise a plurality of power splitters, a plurality of mixer and the mobile communication base station that is connected with the mixer input, described repeater is a digital television repeater, and described mixer exports one tunnel radiofrequency signal demultiplexing radiofrequency signal of described digital television repeater and mobile communication base station output in the mixer to.Described mixer is used for electromagnetic wave signal is carried out filtering, will be sent in the described leaky cable behind digital television signal and the mobile communication signal synthetic a tunnel again.
Among Fig. 1, suppose to put on the shelf and be provided with antenna on the ground of platform one, after by long feeder line radiofrequency signal being delivered to low noise amplifier, through the signal processing and amplifying, send into repeater 1, before signal enters repeater 1, deliver to light and send out machine by coupler one road signal that is coupled, signal source as the part subway line, light is sent out machine and is converted the electrical signal to light signal, through first optical coupler, deliver to second optical coupler of platform two and platform four respectively, second optical coupler in the platform two is coupled one road signal to optical receiver, the ratio of the signal of coupling is divided according to the required power of optical receiver, send in the repeater 2, the road light signal of exporting is in addition delivered in second coupler of platform three more simultaneously again, same one road signal continues to deliver on other platforms, another road coupled signal is delivered to optical receiver, converts light signal to radiofrequency signal, delivers to repeater 3 again.Platform four in the accompanying drawing 1, platform five optical signal sources transmission situation and above-mentioned platform two, platform three are identical.
Among Fig. 2, the output signal of digital television repeater and the output signal of mobile communication base station are closed the road, because electric wave can produce various harmonic waves and intermodulation after synthetic, make phase mutual interference between the signal.Can pass through the multiple filter chamber, satisfy insulated degree requirement, get rid of the influence that various harmonic waves interfere with each other, make TV and signal of communication can in leaky cable, be total to the cable transmission.Close in the cladding system of road at the signal shown in the accompanying drawing 2, the radiofrequency signal of digital television repeater output is through power splitter, be divided into four road signals, four road GSM downstream signals with the mobile communication base station pass through mixer 11 respectively, mixer 12, mixer 13, mixer 14 carry out signal and close the road, the signal that closes behind the road is delivered in four sections leaky cables 21,22,23,24, realizes that the signal in the subway tunnel covers.
Digital television signal is total to the cable transmission technology among the utility model embodiment, the optical fiber and the leaky cable resource of subway have been made full use of, coverage effect is good, can solve the problem that different frequency signals interferes with each other, adopt digital television repeater to combine transmission manner with leaky cable, greatly reduce the construction cost of system, avoided building high-power transmitter and the electromagnetic pollution that causes.Solve a difficult problem of in subway, watching mobile TV, satisfied the demand that track traffic passenger's real time information is obtained.
Claims (9)
1. mobile TV subway tunnel covering system based on leaky cable is characterized in that comprising:
LNA is used for that signal source is amplified to light and sends out the required operation level of machine;
Light is sent out machine, is used for the radiofrequency signal of LNA output is changed into light signal;
First optical coupler with at least one input and a plurality of outputs, the luminous power that is used for described light is sent out machine output is distributed into the multichannel luminous power;
Receive machine by a plurality of light that optical fiber links to each other with the output of described first optical coupler, be used for light signal is changed into radiofrequency signal;
Leaky cable with described light receipts machine is connected is used for emitting radio frequency signal.
2. the mobile TV subway tunnel covering system based on leaky cable according to claim 1, it is characterized in that: comprise that also being connected in light receives repeater between machine and the described leaky cable, be used to strengthen the power output of the radiofrequency signal that described light receipts machine exports.
3. the mobile TV subway tunnel covering system based on leaky cable according to claim 2, it is characterized in that also comprising: a plurality of second optical couplers, described second optical coupler has at least one input and a plurality of output, the input of each described second optical coupler links to each other with the output of described first optical coupler or the output of other second optical coupler by optical fiber, wherein the input of at least one described second optical coupler links to each other by the output of optical fiber with described first optical coupler, and described a plurality of light receipts machines are connected on the output of described first optical coupler or second optical coupler.
4. the mobile TV subway tunnel covering system based on leaky cable according to claim 3 is characterized in that: described first optical coupler and second optical coupler all have an input and two outputs.
5. the mobile TV subway tunnel covering system based on leaky cable according to claim 4, it is characterized in that: it is identical with the described second optical coupler quantity that described light is received machine, and each described light is received machine and all is connected on the output of described second optical coupler.
6. the mobile TV subway tunnel covering system based on leaky cable according to claim 1, it is characterized in that: send out at described LNA and described light and also be provided with a coupler between the machine, part level to the described light that is used for telling described LNA output is sent out machine.
7. the mobile TV subway tunnel covering system based on leaky cable according to claim 6 is characterized in that: an output of described coupler is connected with a repeater and leaky cable in turn.
8. according to claim 2 or 7 described mobile TV subway tunnel covering systems based on leaky cable, it is characterized in that: also comprise mixer and the mobile communication base station that is connected with the mixer input, the output of described mixer links to each other with leaky cable, described repeater is a digital television repeater, described mixer is used for electromagnetic wave signal is carried out filtering, will be sent in the described leaky cable behind digital television signal and the mobile communication signal synthetic a tunnel again.
9. the mobile TV subway tunnel covering system based on leaky cable according to claim 8, it is characterized in that: also comprise a plurality of power splitters, be used for exporting one tunnel radiofrequency signal demultiplexing radiofrequency signal of described digital television repeater and mobile communication base station output to mixer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200673346U CN201048446Y (en) | 2007-02-13 | 2007-02-13 | Leakage cable based mobile television signal underground tunnel overlapping system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200673346U CN201048446Y (en) | 2007-02-13 | 2007-02-13 | Leakage cable based mobile television signal underground tunnel overlapping system |
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| Publication Number | Publication Date |
|---|---|
| CN201048446Y true CN201048446Y (en) | 2008-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200673346U Expired - Fee Related CN201048446Y (en) | 2007-02-13 | 2007-02-13 | Leakage cable based mobile television signal underground tunnel overlapping system |
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| CN (1) | CN201048446Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116367114A (en) * | 2023-03-01 | 2023-06-30 | 南京地铁运营有限责任公司 | Communication wireless system of urban rail transit |
-
2007
- 2007-02-13 CN CNU2007200673346U patent/CN201048446Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116367114A (en) * | 2023-03-01 | 2023-06-30 | 南京地铁运营有限责任公司 | Communication wireless system of urban rail transit |
| CN116367114B (en) * | 2023-03-01 | 2024-02-23 | 南京地铁运营有限责任公司 | Communication wireless system of urban rail transit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Shanghai Oriental Pearl Radio and TV R&D Co., Ltd. Assignor: Shanghai Oriental Pearl Co., Ltd. Contract fulfillment period: 2009.8.10 to 2015.8.10 Contract record no.: 2009990000951 Denomination of utility model: Mobile television signal subway tunnel covering system based on leakage cable Granted publication date: 20080416 License type: Exclusive license Record date: 20090825 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.8.10 TO 2015.8.10; CHANGE OF CONTRACT Name of requester: SHANGHAI ORIENTAL PEARL BROADCAST AND TV RESEARCH Effective date: 20090825 |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080416 Termination date: 20120213 |