CN204350189U - A kind of portable mobile wireless video frequency transmitter - Google Patents
A kind of portable mobile wireless video frequency transmitter Download PDFInfo
- Publication number
- CN204350189U CN204350189U CN201520046509.XU CN201520046509U CN204350189U CN 204350189 U CN204350189 U CN 204350189U CN 201520046509 U CN201520046509 U CN 201520046509U CN 204350189 U CN204350189 U CN 204350189U
- Authority
- CN
- China
- Prior art keywords
- circuit
- signal
- wireless video
- mobile wireless
- portable mobile
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Closed-Circuit Television Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The utility model discloses a kind of portable mobile wireless video frequency transmitter, relate to radio transmission technical field; It comprises wireless video transmitter and multiple portable mobile wireless video receiver, and described wireless video transmitter comprises multi-channel video input interface, image compression encoding circuit, multiplex circuit, modulation circuit and the radiating circuit that the signal of telecommunication successively connects; Described portable mobile wireless video receiver comprises receiving circuit, demodulator circuit, de-multiplexing circuitry, image decoding circuit, Graphics Processing circuit and the display screen that the signal of telecommunication successively connects; The beneficial effects of the utility model are: high ferro is respectively saved, and the image in compartment can be real-time is transferred on portable video reception machine that vehicular police and train crews carry with, the image in compartment can respectively be saved by real-time reception in vehicular police and the train crews any place in train to whole train, thus greatly improve the means of information transmission, improve the operating efficiency of emergency event process.
Description
Technical field
The utility model relates to radio transmission technical field, and more particularly, the utility model relates to a kind of portable mobile wireless video frequency transmitter.
Background technology
Railway is the main artery of Chinese national economy, and be national important transportation department, it is normal and stably run the normal operation determining national product, life, is subject to the great attention of country and railway parent company always.Along with the high speed development of China's economic, China Railway High-speed builds also develop rapidly, and position is at the forefront in the world for its total kilometrage number.
In recent years, Railway Passenger Stations and periphery there occurs the terrified case of a lot of violence in succession, and cloudlike the terrified case of Nanning-Kunming's naked light station 3.01 violence, the felonies etc. such as Urumchi, Xinjiang 4.30 the terrorist bombings case, cause heavy losses to the people's lives and property.
Therefore, on the high ferro train of running at high speed, for vehicular police and train crews are equipped with portable mobile wireless video receiver device, with the monitoring camera head system installed in compartment on train with the use of, once certain joint compartment generation accident, vehicular police and train crews can see the image of the site of the accident in real time in any joint compartment, make alarm reaction and disposal, loss can be reduced to minimum in the very first time.
Because high ferro wireless video transmission system technical requirement is special, threshold is high, need to adopt advanced Video Supervision Technique, high-speed radio video communication technology.
First, bullet train is in the middle of high-speed cruising, and railway car height is closed, serious shielding between compartment and compartment divide.Therefore, require that communication equipment has non line-of-sight communication ability.
Secondly, on bullet train, passenger is a lot, and a lot, electronic signal is complicated for electronic equipment and communication equipment, and electromagnetic environment is severe, therefore requires that equipment has stronger antijamming capability.
Further, owing to high ferro needing the image information of real-time Transmission reach more than eight tunnels, amount of image information is large, and transmission bandwidth is large especially, therefore first requires that wireless image device has higher message transmission rate; Require to adopt Efficient Compression coded image compress technique simultaneously, under ensureing low bit-rate, substantially do not lose the information in image.Image compression can not be too responsive to error code, becomes the difficult problems such as multipath when can adapt to wireless channel high bit-error.
Utility model content
The purpose of this utility model is the deficiency overcoming above-mentioned technology, a kind of portable mobile wireless video frequency transmitter is provided, this device has fully utilized high-speed wireless digital communication technology and high efficiency digital image coding technology, vehicular police when meeting with accident on train and staff can see on-the-spot picture in the very first time and make fastest response, prevent spreading and upgrading of event, its volume is little, lightweight, has good portability and mobility.
The technical solution of the utility model is achieved in that a kind of portable mobile wireless video frequency transmitter, and comprise wireless video transmitter and multiple portable mobile wireless video receiver, its improvements are:
Described wireless video transmitter comprises the multi-channel video input interface that the signal of telecommunication successively connects, image compression encoding circuit, multiplex circuit, modulation circuit and radiating circuit, described video input interface receives each road vision signal from monitoring camera on bullet train, the each road vision signal of image compression encoding circuit to input carries out compressed encoding process with output squeezing vision signal, described multiplex circuit carries out multiplexing process to compressed video signal, synthesize a road stream of video data, described modulation circuit carries out digital modulation to stream of video data, signal after modulation treatment is launched by transmitting antenna by radiating circuit,
Described portable mobile wireless video receiver comprises the receiving circuit that the signal of telecommunication successively connects, demodulator circuit, de-multiplexing circuitry, image decoding circuit, Graphics Processing circuit and display screen, described receiving circuit receives by reception antenna the signal that above-mentioned transmitting antenna sends, described demodulator circuit carries out demodulation process to the signal that described receiving circuit exports, described de-multiplexing circuitry carries out demultiplexing to the data code flow after demodulation, data code flow is reduced to multi-path video data code stream, the image decoding circuit of described multichannel carries out decompression with reduction also outputting video signal to the stream of video data signal that described de-multiplexing circuitry exports, described Graphics Processing circuit delivers to display screen display after carrying out control treatment to outputting video signal.
In such a configuration, the transmitting terminal amplifying circuit also comprise transmitting terminal frequency changer circuit that the intermediate-freuqncy signal frequency-conversion processing after by described modulation is high-frequency signal in the radiating circuit of described transmitter, amplifying to described high-frequency signal, be used for exporting the transmitting terminal bandwidth-limited circuit that high-frequency signal carries out bandpass filtering treatment and the transmitting antenna launched by the high-frequency signal after amplifying to described transmitting terminal amplifying circuit.
In such a configuration, also comprise in the receiving circuit of described receiver for receive described transmitting antenna send high-frequency signal reception antenna, receiving terminal amplifying circuit, the receiving terminal bandwidth-limited circuit carrying out bandpass filtering treatment for the high-frequency signal exported described receiving terminal amplifying circuit that received high-frequency signal is amplified, frequency-conversion processing is carried out to export intermediate-freuqncy signal receiving terminal frequency changer circuit to the high-frequency signal after amplifying.
In such a configuration, described reception antenna adopts double antenna, the aerial diversity receiving technology of this double antenna support, strengthens the antijamming capability of portable mobile wireless video receiver, improves the sensitivity of portable mobile wireless video receiver.
In such a configuration, the described wireless video transmitter eight road image compression encoding circuit that include eight road video input interfaces and be connected with the eight road video input interface signals of telecommunication respectively.
In such a configuration, described receiver comprises eight road image decoding circuits.
In such a configuration, the image compression encoding circuit in described transmitter adopts H.264 encoder; Image decoding circuit in described receiver adopts H.264 decoder.
In such a configuration, the modulation circuit of described transmitter adopts COFDM modulation technique, and the demodulator circuit of described receiver adopts COFDM demodulation techniques.
In such a configuration, the Graphics Processing circuit of described portable mobile wireless video receiver has MCU processor, realizes the display and control to multi-channel video signal.
In such a configuration, described display screen comprises display drive circuit and the screen for showing the image frame received in real time, and display screen adopts 7 cun of LCDs of 16:9.
The beneficial effects of the utility model are: the portable mobile wireless video frequency transmitter of this kind of bullet train of the present utility model, high ferro is respectively saved, and the image in compartment can be real-time is transferred on portable video reception machine that vehicular police and train crews carry with, the image in compartment can respectively be saved by real-time reception in vehicular police and the train crews any place in train to whole train, thus greatly improve the means of information transmission, improve the operating efficiency of emergency event process; When train occurs quick-fried probably event, the vehicular police on train and staff can see on-the-spot picture in the very first time and make fastest response, and adopt an effective measure, react rapidly, uniform crime, prevents spreading and upgrading of event; In addition, its portable video reception body amass little, lightweight, there is good portability and mobility, can be carried with by vehicular police and staff.
Accompanying drawing explanation
Fig. 1 is the functional-block diagram of the utility model portable mobile wireless video frequency transmitter;
Fig. 2 is the functional-block diagram of wireless video transmitter of the present utility model;
Fig. 3 is the functional-block diagram of portable mobile wireless video receiver of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in more detail.
The utility model discloses a kind of portable mobile wireless video frequency transmitter, Fig. 1 is the functional-block diagram of portable mobile wireless video frequency transmitter described in the utility model, the utility model is fixedly mounted on the transmitting set on high ferro train by one, and coordinate with it the mobile multiple portable receivers used ON TRAINS, corresponding high ferro portable mobile wireless video frequency transmitter can be formed, the image making high ferro respectively save compartment can be transferred on the portable video reception machine that vehicular police and train crews carry with in real time, the image in compartment can respectively be saved by real-time reception in vehicular police and the train crews any place in train to whole train, thus greatly improve the means of information transmission, improve the operating efficiency of emergency event process.
Particularly, composition graphs 1, shown in Fig. 2, portable mobile wireless video frequency transmitter of the present utility model comprises wireless video transmitter and multiple portable mobile wireless video receiver, wherein, wireless video transmitter comprises the eight road video input interfaces that the signal of telecommunication successively connects, image compression encoding circuit, multiplex circuit, modulation circuit and radiating circuit, the monitoring camera that the signal of eight road video input interfaces of wireless video transmitter is installed by compartment each on bullet train provides, respectively compressed encoding process is carried out to eight tunnel vision signals of input by image compression encoding circuit, by multiplex circuit 13, multiplexing process is carried out to eight road compressed video signals again, then the modulation circuit 14 outputted to thereafter is modulated, again by transmitting terminal frequency changer circuit 151 by modulation after intermediate-freuqncy signal frequency-conversion processing be high-frequency signal, then transmitting terminal amplifying circuit 152 amplifies, deliver to transmitting terminal bandwidth-limited circuit 153 again and carry out High frequency filter, then deliver to transmitting terminal power amplification circuit 154 pairs of high-frequency signals to amplify, finally be sent to transmitting antenna to be launched.
As shown in Figure 3, in portable video reception machine, comprise the receiving circuit that the signal of telecommunication successively connects, demodulator circuit, de-multiplexing circuitry, image decoding circuit, Graphics Processing circuit and display screen, also comprise in receiving circuit for receive described transmitting antenna send the reception antenna of high-frequency signal, receiving terminal amplifying circuit 211, receiving terminal bandwidth-limited circuit 212, receiving terminal frequency changer circuit 213, wherein, reception antenna adopts double antenna, the aerial diversity receiving technology of this double antenna support, strengthen the antijamming capability of portable mobile wireless video receiver, improve the sensitivity of portable mobile wireless video receiver.Carry out describing to the workflow of portable video reception machine below: first receive wireless video signal that transmitter sends by receiving terminal amplifying circuit 211, then be sent to the interference signal outside receiving terminal bandwidth-limited circuit 212 filter out-band, then be intermediate-freuqncy signal by receiving terminal frequency changer circuit 213 by the high-frequency signal frequency-conversion processing received; Intermediate-freuqncy signal is sent to demodulator circuit 22 and carries out demodulation, is reduced to video counts code stream, then will be reduced to eight tunnels independently video counts code stream by the video counts code stream after de-multiplexing circuitry 23 demodulation, and the image decoding circuit delivered to respectively below recovers vision signal; Vision signal delivers to display screen display after Graphics Processing circuit 25 processes.
As can be seen from Figure 3, for being convenient to the display of vision signal further, also having one group of action button at the output of Graphics Processing circuit, being convenient to select the display mode of image: show a road image, display two-way image, shows four road images, shows eight road images.
The utility model emphasis is the difficult problem that the most video informations solving large information capacity realize real-time Transmission under the complex environment of non line of sight, mainly have employed advanced digital image coding technology and radio digital communication technology, below mainly it is discussed.
First image compression encoding circuit is introduced: due to containing much information of image in vision signal, the transmission bandwidth taking memory capacity and requirement is large especially, therefore first Efficient Compression coding to be carried out to it, to reach the image compression of ELF magnetic field, ensure image not loss of information substantially in transmitting procedure simultaneously.In addition, also require that image compression can not be too responsive to error code, can adapt to the high bit-error of wireless channel transmission, time become the problems such as multipath, and cost can not be too high.
For this reason, adopt existing H.264 image compression encoding and decoding technique in the present embodiment, support high-definition image, compression ratio is high, and adopts corresponding ASIC (application-specific integrated circuit (ASIC)) chip.Its image resolution ratio can reach 720X576 pixel/frame (SD), speed can reach 25 frames/second, real-time Transmission dynamic image respond well, without " animation " sensation, clear picture, " action " agility, can meet the needs of scene of the accident realtime graphic transmission.
Then introduce COFDM modulation technique: when information is transmitted under wireless channel conditions, require that there is higher communication quality; Particularly under the geography, electromagnetic environment of more complicated, require that communication port has stronger anti-interference and ability that is anti-fading, anti-multipath, the common communication technology is difficult to meet above-mentioned requirements.Therefore, adopt existing COFDM technology in the present embodiment, and adopt high-speed figure process (DSP) technology and FPGA Integrated design, to realize high performance COFDM circuit design, its circuit design integrated level is high, good reliability.
COFDM is the high speed transmission technology under a kind of wireless environment, COFDM technology is, in frequency domain, given channel is divided into many orthogonal sub-channels, a subcarrier is used to modulate on each of the sub-channels, and each subcarrier parallel transmission, can interference greatly between erasure signal waveform, turn improve the availability of frequency spectrum simultaneously.COFDM technology is adopted to have following advantage: 1, support non line of sight transmission, signal stabilization is reliable under complex environment; 2, support the communication of high-speed mobile condition, be suitable for airborne equipment and high ferro equipment.3, powerful forward error correction coding technology, antijamming capability is strong, and the error rate is low; 4, modulation efficiency is high, and data rate is high, is suitable for the business of the large information capacities such as real-time Transmission image.
To sum up, the portable mobile wireless video frequency transmitter of this kind of bullet train that the utility model discloses, the image making high ferro respectively save compartment can be transferred on the portable video reception machine that vehicular police and train crews carry with in real time, the image in compartment can respectively be saved by real-time reception in vehicular police and the train crews any place in train to whole train, thus substantially improve the means of information transmission, improve the operating efficiency of emergency event process; When train occurs quick-fried probably event, the vehicular police on train and staff can see on-the-spot picture in the very first time and make fastest response, and adopt an effective measure, react rapidly, uniform crime, prevents spreading and upgrading of event; In addition, its portable video reception body amass little, lightweight, there is good portability and mobility, can be carried with by vehicular police and staff.
Described above is only preferred embodiment of the present utility model, and above-mentioned specific embodiment is not to restriction of the present utility model.In technological thought category of the present utility model, can occur various distortion and amendment, all those of ordinary skill in the art, according to describing retouching, the amendment made above or equivalent replacing, all belong to the scope that the utility model is protected.
Claims (10)
1. a portable mobile wireless video frequency transmitter, comprises wireless video transmitter and multiple portable mobile wireless video receiver, it is characterized in that:
Described wireless video transmitter comprises the multi-channel video input interface that the signal of telecommunication successively connects, image compression encoding circuit, multiplex circuit, modulation circuit and radiating circuit, described video input interface receives each road vision signal from monitoring camera on bullet train, the each road vision signal of image compression encoding circuit to input carries out compressed encoding process with output squeezing vision signal, described multiplex circuit carries out multiplexing process to compressed video signal, synthesize a road stream of video data, described modulation circuit carries out digital modulation to stream of video data, signal after modulation treatment is launched by transmitting antenna by radiating circuit,
Described portable mobile wireless video receiver comprises the receiving circuit that the signal of telecommunication successively connects, demodulator circuit, de-multiplexing circuitry, image decoding circuit, Graphics Processing circuit and display screen, described receiving circuit receives by reception antenna the signal that above-mentioned transmitting antenna sends, described demodulator circuit carries out demodulation process to the signal that described receiving circuit exports, described de-multiplexing circuitry carries out demultiplexing to the data code flow after demodulation, data code flow is reduced to multi-path video data code stream, the image decoding circuit of described multichannel carries out decompression with reduction also outputting video signal to the stream of video data signal that described de-multiplexing circuitry exports, described Graphics Processing circuit delivers to display screen display after carrying out control treatment to outputting video signal.
2. a kind of portable mobile wireless video frequency transmitter according to claim 1, is characterized in that: the transmitting terminal amplifying circuit also comprise transmitting terminal frequency changer circuit that the intermediate-freuqncy signal frequency-conversion processing after by described modulation is high-frequency signal in the radiating circuit of described transmitter, amplifying to described high-frequency signal, be used for exporting the transmitting terminal bandwidth-limited circuit that high-frequency signal carries out bandpass filtering treatment and the transmitting antenna launched by the high-frequency signal after amplifying to described transmitting terminal amplifying circuit.
3. a kind of portable mobile wireless video frequency transmitter according to claim 1, is characterized in that: also comprise in the receiving circuit of described receiver for receive described transmitting antenna send the reception antenna of high-frequency signal, the receiving terminal amplifying circuit that received high-frequency signal is amplified, carry out for the high-frequency signal exported described receiving terminal amplifying circuit bandpass filtering treatment receiving terminal bandwidth-limited circuit, frequency-conversion processing is carried out to export intermediate-freuqncy signal receiving terminal frequency changer circuit to the high-frequency signal after amplifying.
4. a kind of portable mobile wireless video frequency transmitter according to claim 1 and 2, it is characterized in that: described reception antenna adopts double antenna, the aerial diversity receiving technology of this double antenna support, strengthen the antijamming capability of portable mobile wireless video receiver, improve the sensitivity of portable mobile wireless video receiver.
5. a kind of bullet train portable mobile wireless video frequency transmitter according to claim 1, is characterized in that: the eight road image compression encoding circuit that described wireless video transmitter includes eight road video input interfaces and is connected with the eight road video input interface signals of telecommunication respectively.
6. a kind of bullet train portable mobile wireless video frequency transmitter according to claim 1, is characterized in that: described receiver comprises eight road image decoding circuits.
7. a kind of portable mobile wireless video frequency transmitter according to claim 1, is characterized in that: the image compression encoding circuit in described transmitter adopts H.264 encoder; Image decoding circuit in described receiver adopts H.264 decoder.
8. a kind of portable mobile wireless video frequency transmitter according to claim 1, is characterized in that: the modulation circuit of described transmitter adopts COFDM modulation technique, and the demodulator circuit of described receiver adopts COFDM demodulation techniques.
9. a kind of portable mobile wireless video frequency transmitter according to claim 1, is characterized in that: the Graphics Processing circuit of described portable mobile wireless video receiver has MCU processor, realizes the display and control to multi-channel video signal.
10. a kind of portable mobile wireless video frequency transmitter according to claim 1, is characterized in that: described display screen comprises display drive circuit and the screen for showing the image frame received in real time, and display screen adopts 7 cun of LCDs of 16:9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520046509.XU CN204350189U (en) | 2015-01-22 | 2015-01-22 | A kind of portable mobile wireless video frequency transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520046509.XU CN204350189U (en) | 2015-01-22 | 2015-01-22 | A kind of portable mobile wireless video frequency transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204350189U true CN204350189U (en) | 2015-05-20 |
Family
ID=53233426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520046509.XU Expired - Fee Related CN204350189U (en) | 2015-01-22 | 2015-01-22 | A kind of portable mobile wireless video frequency transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204350189U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105763852A (en) * | 2016-04-06 | 2016-07-13 | 华东师范大学 | Wireless high-definition video real-time transmission method and device |
-
2015
- 2015-01-22 CN CN201520046509.XU patent/CN204350189U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105763852A (en) * | 2016-04-06 | 2016-07-13 | 华东师范大学 | Wireless high-definition video real-time transmission method and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE69737708T2 (en) | A single-chip solution for multimedia GSM systems with mobile stations | |
| CN103051928A (en) | Method and device for wireless audio and video data transmission | |
| CN107359900A (en) | A kind of modem suitable for overlength distance scattering link | |
| CN104459721A (en) | Beidou short message all-directional receiving and sending user receiver terminal | |
| CN117833977A (en) | Beidou communication system for transmitting voice and pictures based on soft compression coding | |
| CN103501424A (en) | TDMA+TDD model high-speed image transmitting system, communication control method and working method | |
| CN102821072B (en) | Sending method, receiving method, sending system, receiving system, sending device and receiving device for IQ (In-phase quadrature) data | |
| CN104038843A (en) | Train comprehensive service platform on basis of gigabit Ethernet and WIFI (wireless fidelity) technology | |
| CN1777291A (en) | Wireless digital multi-channel video, voice and data mobile transmission device | |
| CN204498226U (en) | A kind of WirelessHD network camera device | |
| CN101882935A (en) | Dual-mode transmitter | |
| CN204350189U (en) | A kind of portable mobile wireless video frequency transmitter | |
| CN106412384A (en) | Video processing system | |
| CN111225360B (en) | Narrow-band wireless communication system and method | |
| CN100505583C (en) | Ultra-short wave OFDM mobile multimedia sensor network transmission system | |
| CN102217208A (en) | A method for transmitting signals, a combiner and a system thereof | |
| CN203608303U (en) | Unmanned plane ultralow time-delay digital high-definition image emission module | |
| CN109617594B (en) | Instruction image transmission system and method of frequency division multiple access and time division multiple access mixed system | |
| CN201533412U (en) | Dual-mode transmitter | |
| CN101562472A (en) | System and method for realizing mobile communication on high-speed motion apparatus | |
| CN201435790Y (en) | Wireless multi-carrier vehicle bidirectional audio-video and data transmission device | |
| CN204945791U (en) | A kind of single rotor wing unmanned aerial vehicle flight control system | |
| CN202043215U (en) | Mobile live broadcast car | |
| CN2865164Y (en) | Ultra-short wave wireless digital video frequency mobile communication machine | |
| CN101742253A (en) | Microwave digital image transmission system for mobile command of power emergency repair work |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150520 Termination date: 20160122 |
|
| EXPY | Termination of patent right or utility model |