CN2676537Y - Wireless digital television signal transmission and covering system for enclosed space - Google Patents
Wireless digital television signal transmission and covering system for enclosed space Download PDFInfo
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- CN2676537Y CN2676537Y CN 200420000681 CN200420000681U CN2676537Y CN 2676537 Y CN2676537 Y CN 2676537Y CN 200420000681 CN200420000681 CN 200420000681 CN 200420000681 U CN200420000681 U CN 200420000681U CN 2676537 Y CN2676537 Y CN 2676537Y
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Abstract
The utility model discloses a wireless digital television signal transmission and covering system for enclosed spaces, such as subways, etc. The wireless digital television signal transmission and covering system comprises a digital television transmitter 3 receiving digital signals to be broadcasted and downloading a radio-frequency base band, a radio-frequency circuit combiner 4 combining radio-frequency signals with different frequencies, a leakage cable 5 transmitting signals and a television receiver 7 receiving the signals and outputting the signals to a display. The transmission and covering system of the utility model is installed in enclosed environments, such as the subways, etc. The transmission and covering system transmits the image, voice and data signals of the television in a wireless mode, can realize that the trains of the subways and platforms receive the digital signals of the different frequency bands and video code streams positioned different time slots and also can be used as the passages of the liaison controlling centers of the trains of the subways so as to be convenient for drivers to monitor the situations of the platforms and the tunnels and be favourable for the safe operation of the subways.
Description
Technical field
The utility model relates to the wireless digital signal transfer equipment, more specifically, relates to the wireless digital TV-set signal transmission apparatus of enclosure spaces such as covering subway and vcehicular tunnel.
Background technology
Simulated television has had seven, 80 years so far by invention, and the development of over half a century has also been experienced in commercial TV broadcasting, but wireless television signal transmits at ground space always, and outside the building face then erects a television antenna and strengthens indoor signal.The emission of conventional analog television signals is the antenna that utilizes at the TV cat head, the user propagates towards periphery, see Fig. 1, owing to adopted " single-point--high-power " emission mode, therefore the effect that causes is the outdoor signal skewness, and indoor signal is faint, and the inferior enclosure space in ground can not receive signal fully, so, can't received television signal in the underground and enclosed environment.In addition, anolog TV signals also can't be done to move because of reflection interference and receive.
China in 2002 in Beijing, Shanghai and Shenzhen open wireless Digital Television pilot, its characteristics of attracting attention most are exactly the TV programme that can receive high definition under mobile status.The wireless digital TV-set signal is in outdoor emission, the general mode that adopts " multiple spot--small-power ", promptly set up a plurality of transponders to transmit the signal that television tower sends, set up a plurality of emissions zonule, to solve the problem of Large Volume Data transmission, its set of systems becomes: television tower+antenna+signal repeater, and as Fig. 2.Because radio signal as light, is propagated with linear fashion in air, its signal strength signal intensity will become very weak after transmitting a very short segment distance, and same, Digital Television also can't receive in underground and enclosed environment.But Digital Television possesses error correction, can realize vehicle mobile reception under steam, and it should be utilized in the train that subway etc. moves in the tunnel.So need to solve the radio signal covering problem in vcehicular tunnel and the subway tunnel.
Existing train-installed closed-circuit television (IN-CABIN CLOSED CIRCUIT TV or IN-CABIN CCTV) can monitor the situation of the place ahead platform for the driver, and contact control centre is to strengthen safe train operation.Up at present, IN-CAB CCTV is microwave and the infrored equipment that adopts Point-to-Point (point-to-point), because subway tunnel has the certain camber and the gradient, the general train preceding 50 meters air line distance that enters the station, could start the platform function for monitoring, this moment, train promptly entered platform in about about 10 seconds, more needed certain distance to stop.During the place ahead platform generation emergency case, because of the reaction time too short, inoperative for vehicle safety.Its function is only limited to and makes things convenient for the train operator stopping that monitored passenger goes out between the starting period, advancing the situation of train.A kind ofly can allow the vehicle drivers that in this kind environment, moves reach the ability of telemonitoring, improve the train operating safety level in enclosure spaces such as subway tunnel transmission and the system that covers the wireless digital TV-set signal by TV.
Summary of the invention
Problem to be solved in the utility model is that signal transmission and the covering system that transmits digital radio TV signal in a kind of feasible picture subway and this class enclosure space of vcehicular tunnel will be provided, and making to receive in this kind enclosure space and transmit Digital Television becomes possibility.
Technical scheme of the present utility model is: transmission of enclosure space wireless digital TV-set signal and covering system is characterized in that comprising:
Digital TV transmitter 3, the digital television signal with input downloads in the radio frequency baseband signal and exports;
Radio frequency mixer 4 is exported after needing radio signals transmitted to close the road radiofrequency signal of described digital TV transmitter 3 and other;
Leaky cable 5 is laid in the enclosure space of demand, the space at transmitting radio frequency signal and covering cable place;
Digital television receiver 7, process reception antenna 6 receives the signal of described leaky cable 5, exports to display.
Transmission covering system of the present utility model can receive and launch the Digital Television radiofrequency signal simultaneously in enclosure space, it is stable that its signal uninterruptedly reaches field intensity, order also can be play real-time news and exploitation business activity for the user provides real-time distinct image on the subway train of high-speed mobile.
In addition, native system is owing to cover subway, tunnel completely, except that digital TV and voice, data, also can realize vehicle-mounted platform closed-circuit television telemonitoring.Train in the tunnel midway or when leaving former platform, the driver can monitor the image of next stop platform, in case run into situation, 80 kilometers of F-Zeros, press the train brake hard, can stop fully in the distance of 190--215 rice, for the time only about 20 seconds, realize security monitoring truly.
Description of drawings
Fig. 1 is a simulated television launching effect schematic diagram.
Fig. 2 is a Digital Television launching effect schematic diagram.
Fig. 3 is a subway television broadcasting system diagram.
Fig. 4 is that the utility model system constitutes block diagram.
Fig. 5 is a leaky cable structural representation in the utility model system.
Embodiment
Below with reference to description of drawings the utility model embodiment.
Fig. 3 is the subway television broadcasting system diagram of the utility model embodiment.Fig. 4 is the block diagram that the transmission covering system of the utility model embodiment constitutes.
Referring to Fig. 3, complete subway television broadcasting system is divided into 3 parts, and its function is as follows:
After A will concoct from the TV signal in the external world, be sent to the transmitter of subway.
B transmits the signal of digital TV transmitter by the tunnel leaky cable, be sent to the train reception antenna that reaches platform in the tunnel.
After C train receiver receives signal, in train, play on the display.
Fig. 4 is the block diagram that the transmission covering system of the utility model embodiment constitutes.Comprise:
The optical fiber of hanging oneself is sent to TV programme receiver 2 and the TV programme through integrating is sent to digital TV transmitter 3, this digital TV transmitter comprises the ASI input port, raise the price through digital processing and COFDM, and exciter (Exciter), TV signal downloaded in the radio frequency baseband signal export.Whole process meets European Digital Television DVB-T standard.
The radiofrequency signal of digital TV transmitter 3 and other radio signal that need transmit are at radio frequency mixer (POI, Point Of Interface) closes the road in 4, process leaky cable 5 transmits in the tunnel and covers then, except digital television frequencies, also can provide the service of the radio signal of other frequency range simultaneously, for example, GSM 900MHz, CDMA 800MHz, DCS1800MHz, UMTS2200MHz etc.Leaky cable 5 is a kind of special coaxial cables, possesses radio signal transmission and emission/reception dual-use function, its structure is seen shown in Figure 5, the inner wire 51 of center for making by copper cash or copper pipe, after the insulating barrier 52 around inner wire 51 completely cut off, the periphery was surrounded by the outer conductor of being made by Copper Foil 53, and outer conductor 53 upper edge cables vertically distribute and offer a plurality of groove windows 54, this is the fenestra of penetrating described outer conductor 53, and outermost layer is a cable jacket 55.Utilize the groove window 54 on the outer conductor, the radio signal of different frequency evenly is transmitted in the enclosure spaces such as tunnel.Be provided with position, shape, size and the quantity of its groove window change according to the frequency needs design.Radio frequency signal and other frequency band signals of being loaded with digital television program are sent to the train that travels in the tunnel by leaky cable 5, are sent to digital television receiver 7 via mobile receiver aerial 6.Digital television receiver 7 changes into TV programme with radiofrequency signal, broadcasts at Vehicular display device 8.Receiver is set to receive the digital signal of different frequency range, and is positioned at the TV code flow of different time-gap.Export multiple programs and other wireless signal simultaneously to other display system.
Transmission covering system of the present utility model has comprised above-mentioned five major parts from 3--7, the TV programme transmitter of label 1 can be digital signal that the image transitions in any source is become or other signal with the form of data code flow, be sent on the long-range receiving system.Transmission covering system of the present utility model has solved the problem of Digital Television in the space transmission of underground, sealing, be provided at and watch the real-time television program on the mobile train, more existing to utilize the VCD playing video at subway (and public transit vehicle) be a breakthrough improvement.Also realized the telemonitoring of train operator to the place ahead platform.
Claims (2)
1. enclosure space wireless digital TV-set signal transmits and covering system, it is characterized in that comprising:
Digital TV transmitter (3), the digital television signal with input downloads in the radio frequency baseband signal and exports;
Radio frequency mixer (4) is exported after needing radio signals transmitted to close the road radiofrequency signal of described digital TV transmitter (3) and other;
Leaky cable (5) is laid in the enclosure space of demand, the space at transmitting radio frequency signal and covering cable place;
Digital television receiver (7), process reception antenna (6) receives the signal of described leaky cable (5), exports to display.
2. according to transmission of the described enclosure space wireless digital TV-set of claim 1 signal and covering system, it is characterized in that described leaky cable (5) is a slotted coaxial cable, the center is the inner wire (51) that copper cash or copper pipe are made, add that insulating barrier (52) surrounds, surround the outer conductor layer (53) that is made of Copper Foil outside described insulating barrier, outermost layer is oversheath (55); Offer a plurality of groove windows (54) vertical distribution of described outer conductor layer (53) upper edge cable, the quantity of described groove window, shape and size are determined according to frequency needs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420000681 CN2676537Y (en) | 2004-02-10 | 2004-02-10 | Wireless digital television signal transmission and covering system for enclosed space |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420000681 CN2676537Y (en) | 2004-02-10 | 2004-02-10 | Wireless digital television signal transmission and covering system for enclosed space |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2676537Y true CN2676537Y (en) | 2005-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420000681 Expired - Fee Related CN2676537Y (en) | 2004-02-10 | 2004-02-10 | Wireless digital television signal transmission and covering system for enclosed space |
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| CN (1) | CN2676537Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100378744C (en) * | 2005-07-01 | 2008-04-02 | 付屹东 | System for tracing target in long and large space using radio card |
| CN100438611C (en) * | 2006-04-27 | 2008-11-26 | 中国电子科技集团公司第十四研究所 | Urban subway passenger information system based on DVB digital television technology of IP network |
| CN105847901A (en) * | 2016-06-16 | 2016-08-10 | 北京北广传媒地铁电视有限公司 | Subway television media system |
-
2004
- 2004-02-10 CN CN 200420000681 patent/CN2676537Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100378744C (en) * | 2005-07-01 | 2008-04-02 | 付屹东 | System for tracing target in long and large space using radio card |
| CN100438611C (en) * | 2006-04-27 | 2008-11-26 | 中国电子科技集团公司第十四研究所 | Urban subway passenger information system based on DVB digital television technology of IP network |
| CN105847901A (en) * | 2016-06-16 | 2016-08-10 | 北京北广传媒地铁电视有限公司 | Subway television media system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |