CN202049742U - Vehicle-mounted medium play system - Google Patents
Vehicle-mounted medium play system Download PDFInfo
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- CN202049742U CN202049742U CN2011201521012U CN201120152101U CN202049742U CN 202049742 U CN202049742 U CN 202049742U CN 2011201521012 U CN2011201521012 U CN 2011201521012U CN 201120152101 U CN201120152101 U CN 201120152101U CN 202049742 U CN202049742 U CN 202049742U
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- vga
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- media server
- lcd display
- video
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Abstract
The utility model discloses a vehicle-mounted medium play system, comprising a media server used for receiving/processing real-time VGA multimedia information video data flow, a split-screen device used for decoding and distributing video signals and at least two LCD display screens used for displaying videos, wherein a VGA digital encoder is arranged in the media server, and a VGA digital decoder is arranged in the split-screen device. The media server receives VGA media information video data from an external control center in real time, the VGA digital encoder converts the VGA media information video data into TS flow digital signals and transmits the signals to the split-screen device, the VGA digital decoder decodes the TS flow digital signals into VGA video/audio signals, and at last, the VGA video/audio signals are uniformly distributed into each LCD display screen for playing. With a simple wiring, the vehicle-mounted medium play system can transmit high-quality video/audio signals in a complex train environment.
Description
Technical field
The utility model relates to a kind of media play system, particularly is applied to a kind of Vehicular media playing system of train environment.
Background technology
Vision signal is the source of train display device display image in the track traffic, is divided into simulating signal and digital signal.Wherein, simulating signal comprises VGA signal, colour difference signal, S terminal (S-Video) and AV signal, and digital signal then comprises DP digital video signal, HDMI 1.3 digital video signals, HDMI 1.2 digital video signals, DVI digital video signal.And be applied at present in the design of Vehicular media playing system of rail transit train, the transmission course of multimedia messages can be divided into two classes: the one, and the analog transmission mode, the 2nd, digital transmission mode specifically comprises following transmission mode:
(1) composite video (Composite Video) distributes transmission mode: composite video distributes transmission to adopt twisted-pair feeder balance transmission mode, be a kind of of video base band transmission, be that unbalanced mode with 75 Ω is converted to balanced mode and transmits, belong to the analog transmission mode.This mode is not done any processing to 0～6MHz video baseband signal, and from the beginning car cab master to each joint compartment video distributor, arrives the standby media play main frame of trailer cab by the direct transportation simulator vision signal of twisted-pair cable with the media play main frame again.But this transmission mode transmission range is short, the not high (PAL-720*576 of image resolution ratio, NTSC-720*540), transmission of control signals needs other cloth cable, and the high fdrequency component decay is bigger, can't guarantee picture quality, need to use multiple cable wiring, wiring trouble, difficult in maintenance, poor expandability.Simultaneously, under the particular surroundings of rail vehicle (circumstance complications such as electromagnetism, vibration, impact, repeatedly cross hitch), the vision signal that composite video distributes transmission during to display terminal decay serious, a little less than system's anti-electromagnetic interference capability.
(2) VGA twisted-pair visual frequency transmission mode: VGA twisted-pair visual frequency transmission mode is to adopt common netting twine (twisted-pair feeder) to be the VGA video transmission technologies of transmission medium, belongs to the analog transmission mode.This transmission mode respectively is provided with a transmitter at train head, trailer, and every joint compartment is provided with a receipts receptacle, and transmitter carries out recompile with the VGA vision signal to be transmitted on twisted-pair feeder with differential signal, is reduced into the VGA vision signal to the decoding of far-end receiver.There are 4 pairs of twisted-pair feeders netting twine in VGA twisted-pair visual frequency transmission mode the inside, wherein 3 pairs of transmission that are used to finish five kinds of signals of R/G/B/H/V of VGA, and a pair of in addition line is used for transmission of audio.But this transmission mode has only a common netting twine, thereby can't realize the transmission of control signal, needs transmission of control signals just to need other cloth cable between compartment and the compartment, can't satisfy the succinct requirement of train wiring.
(3) SDI (Serial Digital Interface) video transmission mode: SDI is a serial digital interface, be meant the technology that the baseband digital video signal that will meet SMPTE (moving image and Television Engineer association) standard is transmitted by a concentric cable, article one, concentric cable can transmit whole luminance signals, color signal, synchronizing signal and clock information, belongs to digital transmission mode.This transmission mode respectively is provided with a signal transmitter at train head, trailer, and every joint compartment is provided with a signal receiver, finishes the transmission of baseband digital video signal by a concentric cable that runs through the permutation car.But this transmission mode cost is higher, and simultaneously, under the train complex environment, the concentric cable that runs through train needs repeatedly to cross hitch, and decay severity was difficult to the picture quality that reaches desirable when signal arrived trailer in the practice.
The utility model content
Technical problem to be solved in the utility model just provides a kind of Vehicular media playing system, can be in the train environment of complexity high quality video/audio signal, and wiring is simple.
The purpose of this utility model is achieved through the following technical solutions: a kind of Vehicular media playing system, comprise: the media server that is used to receive/handle real-time VGA multimedia messages video data stream, be used to decode and distribute the split screen device of vision signal, at least two LCD display that are used for display video, be provided with the VGA digital encoder in the described media server, be provided with the VGA digital decoder in the described split screen device, described media server is installed on head/tail cab, and described split screen device and LCD display all are installed on compartment, every joint guest room; Wherein, described media server is connected to outside ground control centre, the TCP/IP network that described media server constitutes by CAT5E UTP cable is connected with the split screen device in each saves compartment, can transmit resolution and be 1024 * 768 high-definition image, and the split screen device is connected with LCD display by twisted-pair feeder; Receive VGA media information video data in real time from the outside by media server, convert TS streaming digital signal to and transfer to the split screen device by the VGA digital encoder then, by the VGA digital decoder TS streaming digital signal decoding is reduced into VGA video/audio signal, at last signal-balanced each LCD display that is dispensed to of VGA video/audio is play.
Media server described in the utility model is provided with the control interface of the control signal that is used to receive outside train broadcasting system, be used to receive operation information from train broadcasting system to play on the video window that is superimposed upon LCD display, perhaps adjust the audio volume of media play according to control signal.
Media server described in the utility model is provided with the disk that is used to store non-real time media information, so that call the non-real time media information of playing.
Media server described in the utility model is provided with the remote alarm interface that is used for sending to outside Train Management system alerting signal, crosses when low with convenient disk size and sends alerting signal to the Train Management system.
Split screen device described in the utility model is provided with the H and the V signal that are used for the VGA vision signal and is encoding to the VGA signal transmission device that increases the weight of to handle the back transmission on the rgb signal, described VGA signal transmission device is connected to LCD display by non-shielding five class netting twines, to strengthen inhibition, save the wire rod cost significantly and simplify the engineering wiring common-mode noise and undesired signal.
Be provided with the DC-DC supply convertor in the LCD display described in the utility model, described DC-DC supply convertor is provided with two power interfaces that are used for direct series-fed between each LCD display, to simplify the wiring of inside, guest room.
Compared with prior art, the utlity model has following advantage:
(1) adopts the combination of VGA numerical coding transmission mode and VGA twisted-pair visual frequency transmission mode, the anti-electromagnetic interference performance of system is stronger, video/audio signal attenuation is little, the particular surroundings that can adapt to rail vehicle, and adopt digital IP network, by the Redundancy Design of digital IP network, can improve the reliability of system greatly;
(2) adopt CAT5E UTP cable to make up the TCP/IP Ethernet, realize transmitting video/audio signal and control signal simultaneously between compartment and the compartment, make train wiring brief introduction;
(3) transmit by VGA numerical coding transmission mode and the combination of VGA twisted-pair visual frequency transmission mode, cost is low, the quality height of transmission video/audio.
Description of drawings
Fig. 1 is a system principle synoptic diagram of the present utility model.
Embodiment
Below in conjunction with specific embodiment a kind of Vehicular media playing system described in the utility model is further set forth.
A kind of Vehicular media playing system, comprise: the media server that is used to receive/handle real-time VGA multimedia messages video data stream, be used to decode and distribute the split screen device of vision signal, at least two LCD display that are used for display video, be provided with the VGA digital encoder in the media server, be provided with the VGA digital decoder in the split screen device, media server is installed on head/tail cab, and split screen device and LCD display all are installed on compartment, every joint guest room; Wherein, media server is connected to outside ground control centre, the TCP/IP network that media server constitutes by low smoke and zero halogen type CAT5E UTP cable is connected with the split screen device in each saves compartment, can transmit resolution and be 1024 * 768 high-definition image, and the split screen device is connected with LCD display by twisted-pair feeder; Receive VGA media information video data in real time from outside ground control centre by media server, convert TS streaming digital signal to and transfer to the split screen device by the VGA digital encoder then by 100 m ethernet, by the VGA digital decoder TS streaming digital signal decoding is reduced into VGA video/audio signal, at last signal-balanced each LCD display that is dispensed to of VGA video/audio is play.
Media server adopts the technical grade computing machine, and the plug-in card mode is not used in whole machine using low power consumption CPU, whole plate design, components and parts such as CPU, internal memory all are welded on the wiring board, avoid improving the main frame reliability because equipment anti-vibration ability is strengthened in the influence of connector.Media server is by Vehicle Controller, switch, bridge and antenna acceptance is in real time sent by control center from the external wireless LAN real-time multimedia information video data stream, non real-time multimedia file and the playlist of outside, support the breakpoint transmission function of same transmission content, guarantee the orderly reception information content, do not destroy the integrality and the quality of data of content.
Also be provided with the control interface and the audio interface of the control signal that is used to receive outside train broadcasting system in the media server, be used to receive operation information from train broadcasting system to play on the video window that is superimposed upon LCD display, perhaps the LCD media play system will by with the audio interface and the control signal interface communication of train broadcasting system, realize broadcasting sound accompaniment effect, finish the output of audio frequency by the broadcasting loudspeaker of each guest room; When broadcasting for train, the sound of LCD media play system can automatically switch or force down, and broadcasting for train is when stopping, and it is normal that the sound of vehicle-mounted LCD media play system recovers.When vehicle-mounted LCD media play system was out of service when running into power interruption, behind service restoration, media server can start automatically, and sent to other device of this train LCD media play system by control interface and to restart steering order.
Media server is provided with the disk that is used to store non-real time media information, comprise and store non real-time multimedia file and playlist, so that call the non-real time media information of playing, D1 pictorial data (DVD quality) according to MPEG-2 is stored (compressed encoding that also can carry out the high definition image as required), 120 minutes needs 4GB capacity to multimedia messages.As requested, every train was runed 20 hours every day, needed 3 days program source of storage, then memory capacity=20 (hour) * 60 (minute) * 3 (my god) ÷ 120 (minute) * 4 (GB)=120GB.When not having real-time play stream received signal, media server reads video play lists from the file directory of local appointment, order according to video file in the video play lists reads video file again, after processing such as multiwindow, character stack, output TS flow to the TCP/IP network, and the split screen device on every joint car is decoded and distributed output four tunnel vision signals and sync tone to look signal to play to four the LCD display terminals in this section compartment and show.The log record of multimedia messages that disk also receives and application operating information completely, the record that comprises accepting state, time of reception, do not receive or take defeat, log record saves as text formatting.
Media server is provided with the remote alarm interface that is used for sending to outside Train Management system alerting signal, cross when low (less than 5%) with convenient disk size and send alerting signal to the Train Management system, and in case of emergency at train, by the outside emergency alert signals of this remote alarm interface communications reception, the corresponding prediction scheme emergency treatment of this train equal full screen display of all LCD display terminals information.
VGA digital decoder in the split screen device includes TS stream decoding signals, VGA signal transmission device, wherein the VGA signal transmission device comprises the signal-balanced modular converter of VGA, VGA balanced signal distribution transport module again, the VGA signal transmission device is encoding to the H in the VGA vision signal and V signal to be connected by non-shielding five class netting twines after increasing the weight of on the rgb signal to handle again and is sent to LCD display, to strengthen inhibition, save the wire rod cost significantly and simplify the engineering wiring common-mode noise and undesired signal.The Industrial Ethernet switch module that also comprises DC110V power conversion, 8 100M electricity ports in the split screen device.Because adopt the transmission of digital TS stream signal, signal can guarantee that each compartment is consistent.Divider adopts the balanced signal transmission to LCD display, and the audio/video signal adopts a network cable (4 pairs of lines) just can connect.
Four LCD display are installed in the compartment, every joint guest room, and LCD display carries two loudspeakers, is used for the sound of playing media information; Be provided with the DC-DC supply convertor in LCD display, described DC-DC supply convertor is provided with two power interfaces that are used for direct series-fed between each LCD display, to simplify the wiring of inside, guest room.LCD display terminal screen resolution is set to 1024 * 768, and the LCD screen shows in the mode of multiwindow stack, supports news broadcast window, date time window, the prompt window that arrives at a station, rolling information window.
The mounted on surface of LCD display has AR antireflection tempered glass, both can protect liquid crystal display, can prevent the ambient light line reflection simultaneously, the passenger can be seen more clearly illustrate effect.Antireflection tempered glass (AR) also claims the anti-reflection glass of penetrating.By improving the glass transmissivity, reduce glass-reflected rate principle and make.Can reduce electronics screen, video screen and under environment light source, produce reflective, glare problem, can prevent from the direct reflection of glass material and reach best consistance and sharpness, be applicable to train environment.
Embodiment of the present utility model is not limited thereto, according to foregoing, ordinary skill knowledge and customary means according to this area, do not breaking away under the above-mentioned basic fundamental thought of the utility model prerequisite, equivalent modifications, replacement or change that the utility model can also be made other various ways all can realize the utility model purpose.
Claims (6)
1. Vehicular media playing system, it is characterized in that comprising: the media server that is used to receive/handle real-time VGA multimedia messages video data stream, be used to decode and distribute the split screen device of vision signal, at least two LCD display that are used for display video, be provided with the VGA digital encoder in the described media server, be provided with the VGA digital decoder in the described split screen device, described media server is installed on head/tail cab, and described split screen device and LCD display all are installed on compartment, every joint guest room; Wherein, described media server is connected to outside ground control centre, and the TCP/IP network that described media server constitutes by CAT5E UTP cable is connected with the split screen device in each saves compartment, and the split screen device is connected with LCD display by twisted-pair feeder; Receive VGA media information video data in real time from outside ground control centre by media server, convert TS streaming digital signal to and transfer to the split screen device by the VGA digital encoder then, by the VGA digital decoder TS streaming digital signal decoding is reduced into VGA video/audio signal, at last signal-balanced each LCD display that is dispensed to of VGA video/audio is play.
2. Vehicular media playing system according to claim 1 is characterized in that: described media server is provided with the control interface of the control signal that is used to receive outside train broadcasting system.
3. Vehicular media playing system according to claim 1 is characterized in that: described media server is provided with the disk that is used to store non-real time media information.
4. Vehicular media playing system according to claim 1 is characterized in that: described media server is provided with the remote alarm interface that is used for sending to outside Train Management system alerting signal.
5. Vehicular media playing system according to claim 1, it is characterized in that: described split screen device is provided with the H and the V signal that are used for the VGA vision signal and is encoding to the VGA signal transmission device that increases the weight of to handle the back transmission on the rgb signal, and described VGA signal transmission device is connected to LCD display by non-shielding five class netting twines.
6. Vehicular media playing system according to claim 1 is characterized in that: be provided with the DC-DC supply convertor in the described LCD display, described DC-DC supply convertor is provided with two power interfaces that are used for direct series-fed between each LCD display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201521012U CN202049742U (en) | 2011-05-13 | 2011-05-13 | Vehicle-mounted medium play system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201521012U CN202049742U (en) | 2011-05-13 | 2011-05-13 | Vehicle-mounted medium play system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202049742U true CN202049742U (en) | 2011-11-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201521012U Expired - Fee Related CN202049742U (en) | 2011-05-13 | 2011-05-13 | Vehicle-mounted medium play system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202049742U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102194505A (en) * | 2011-05-13 | 2011-09-21 | 广州国联通信有限公司 | Vehicle-mounted media play system |
| CN105100643A (en) * | 2014-08-06 | 2015-11-25 | 天津高清科技有限公司 | Video transmission and playing structure with multiple terminals and transmission method |
| US10434878B2 (en) | 2015-07-02 | 2019-10-08 | Volvo Truck Corporation | Information system for a vehicle with virtual control of a secondary in-vehicle display unit |
-
2011
- 2011-05-13 CN CN2011201521012U patent/CN202049742U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102194505A (en) * | 2011-05-13 | 2011-09-21 | 广州国联通信有限公司 | Vehicle-mounted media play system |
| CN105100643A (en) * | 2014-08-06 | 2015-11-25 | 天津高清科技有限公司 | Video transmission and playing structure with multiple terminals and transmission method |
| US10434878B2 (en) | 2015-07-02 | 2019-10-08 | Volvo Truck Corporation | Information system for a vehicle with virtual control of a secondary in-vehicle display unit |
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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: 20111123 Termination date: 20120513 |