CN202696806U - Image transmission device based on wireless spectrum spread technology - Google Patents
Image transmission device based on wireless spectrum spread technology Download PDFInfo
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- CN202696806U CN202696806U CN 201220370483 CN201220370483U CN202696806U CN 202696806 U CN202696806 U CN 202696806U CN 201220370483 CN201220370483 CN 201220370483 CN 201220370483 U CN201220370483 U CN 201220370483U CN 202696806 U CN202696806 U CN 202696806U
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Abstract
The utility model discloses an image transmission device based on a wireless spectrum spread technology. The image transmission device comprises a portable transmitter and a receiver matched with the portable transmitter; in the transmitter, input video signals are compressed and encoded by an image compressing and encoding circuit, and then, the compressed video signals are subjected to spectrum spread processing by a spectrum spread circuit and then are output to a transmission circuit behind the spectrum spread circuit; and in the receiver, a receiving circuit firstly receives signals sent out by the transmitter, a spectrum despread circuit carries out despread processing on the received signals, and then, an image decompressing and decoding circuit carries out decompression processing to reduce and output the video signals. An output end of the image decompressing and decoding circuit is further connected with a network interface circuit used for outputting the video signals to an external network. By means of the transmitter and receiver, a corresponding wireless image transmission system can be constituted to realize real-time image transmission, so that the working efficiency of rescue and relief work is improved.
Description
Technical field
The utility model relates to field of wireless transmission, relates in particular to a kind of image transmission based on Technology of Wireless Spread Spectrum that fully utilizes wireless communication technology, Image Compression and network technology.
Background technology
After great work safety accident occured, the actual conditions of the scene of the accident will be that relevant leaders at different levels implement to command the first-hand decision-making foundation of rescuing rescue.Owing to lack effective field data transmission and link up command system, relevant leaders at different levels rely on voice messaging to command, or rush towards hurriedly the scene of the accident and implement commander, adopt an effective measure period and to implement the quality time of tissue rescue thereby very likely delayed the accident onset.Simultaneously, owing to the inconvenience of the information communication between scene of the accident different azimuth, the place, even organize and direct work in the scene of the accident, also may occur incuring loss through delay and confusion, can't implement high efficiency tissue rescue.Therefore, in the rescue that great work safety accident occurs, use effective information system, make commanding agency understand rapidly field condition, rational management and use manpower, material resources, concentrate rear leader and expert's wisdom to instruct rescue operation, very important meaning is arranged.
At present, for the real-time condition image to the major accident scene transmits, normally adopt the modes such as satellite transmission, the relay of helicopter-mounted microwave, point-to-point spread spectrum microwave, traffic monitoring probe, the information such as video, audio frequency, data are sent to command centre.Wherein, satellite transmission needs interim leased line, for the major accident of some burst, usually all can't immediately adopt this mode: the lift-off of awaiting orders after the helicopter microwave is relayed and needed helicopter to receive an assignment, required time is more, and costly: existing point-to-point spread spectrum microwave all adopts the 2.4G frequency range, its signal fadeout is serious, and difficulty penetrates building, and its wave beam is very narrow, the sending and receiving antenna needs accurately directed, installs, sets up, uses extremely inconvenient; And fixedly monitoring probe is to be installed in advance ad-hoc location, and its flexible property is not enough, can not photograph the situation of on-the-spot each point.As seen, aforesaid way of the prior art all can not satisfy the needs that the situation at burst major accident scene is carried out the realtime graphic transmission.
The utility model content
Defects for prior art, the utility model can not satisfy the problem of the situation at burst major accident scene being carried out realtime graphic transmission needs for solving the conventional images transmission technology, a kind of image transmission based on Technology of Wireless Spread Spectrum is provided, this installation cost is low, easy to use, can improve the efficient of the work such as rescue and relief work.
For achieving the above object, described image transmission based on Technology of Wireless Spread Spectrum, comprise backpack transmitter and the receiver that cooperates with it, be characterized in that described transmitter comprises image compression encoding circuit, spectrum spreading circuit and the radiating circuit that in turn communication connects; Wherein, the image compression encoding circuit carries out compressed encoding to the vision signal of input to be processed with the output squeezing vision signal, the compressed video signal that described spectrum spreading circuit is exported described compressed encoding circuit carries out spread processing, and the signal of described radiating circuit after with spread processing launched; Described receiver comprises receiving circuit, solution spectrum spreading circuit and the image decompression decoding circuit that in turn communication connects; Wherein, described receiving circuit receives signal that described transmitter sends, the signal that described solution spectrum spreading circuit is exported described receiving circuit is separated spread spectrum and is processed, and the signal that described image decompression decoding circuit is exported described solution spectrum spreading circuit carries out decompression with reduction and outputting video signal.
Preferably, also comprise the modulation circuit that the signal after the spread processing is modulated into intermediate-freuqncy signal in the radiating circuit of described transmitter, be the transmitting terminal frequency changer circuit of high-frequency signal with the intermediate-freuqncy signal frequency-conversion processing after the described modulation, the transmitting terminal amplifying circuit that described high-frequency signal is amplified, and the transmitting antenna launched of the high-frequency signal after will amplifying.
Preferably, between the described transmitting terminal amplifying circuit and transmitting antenna in the radiating circuit of described transmitter, also be connected to a transmitting terminal bandwidth-limited circuit that is used for described transmitting terminal amplifying circuit output high-frequency signal is carried out bandpass filtering treatment.
Preferably, also comprise in the receiving circuit of described receiver be used to the reception antenna that receives high-frequency signal that described transmitter sends, the receiving terminal amplifying circuit that received high-frequency signal is amplified, high-frequency signal after amplifying is carried out frequency-conversion processing with output intermediate-freuqncy signal receiving terminal frequency changer circuit, and described intermediate-freuqncy signal demodulation process become digital video signal and output to the demodulator circuit of described solution spectrum spreading circuit.
Preferably, between the described receiving terminal amplifying circuit and receiving terminal frequency changer circuit in the receiving circuit of described receiver, also be connected to a receiving terminal bandwidth-limited circuit that is used for the high-frequency signal of described receiving terminal amplifying circuit output is carried out bandpass filtering treatment.
Preferably, in described receiver, also comprise with the output of described uncompressed encoding circuit the network interface circuit that is connected, is used for the vision signal that described uncompressed encoding circuit is exported is outputed to external network.
Preferably, described network interface circuit comprises ethernet interface circuit and wireless lan interfaces circuit.
Preferably, described compressed encoding circuit is the MPEG-4 condensing encoder; Described uncompressed encoding circuit is MPEG-4 uncompressed encoding device.
Preferably, described spectrum spreading circuit is the direct sequence spread spectrum circuit, and described solution spectrum spreading circuit is direct sequence solution spectrum spreading circuit.
Preferably, the operating frequency of described transmitter and receiver is the 336-344MHz frequency range.
The beneficial effects of the utility model are that described image transmission based on Technology of Wireless Spread Spectrum has adopted the wireless frequency expansion transmission technology, and antijamming capability is strong, the high communication quality, and level security is good, and diffracting power is strong, can support high speed mobile transmission; In addition, transmitter is portable in this device, and its volume is little, lightweight, have good portability and mobility; Receiver then can be installed near the control centre of or far-end, can carry transmitter to the scene of the accident by the individual, and captured field condition is real-time transmitted to control centre, and use cost is low and very convenient; Receiver is furnished with network interface circuit, can be directly connected to the network, carry out remote video transmission, and can realize the Internet Transmission of the multimedia messagess such as digital video.
Description of drawings
Fig. 1 shows the functional-block diagram of the image transmission based on Technology of Wireless Spread Spectrum described in the utility model.
Fig. 2 shows in preferred enforcement the of the present utility model functional-block diagram to the transmitter after the further refinement of radiating circuit.
Fig. 3 shows the functional-block diagram of the receiver that matches with the radiating circuit shown in Fig. 2
Embodiment
The utility model is described in more detail below in conjunction with the drawings and specific embodiments:
Fig. 1 shows the functional-block diagram of the image transmission based on Technology of Wireless Spread Spectrum described in the utility model, as shown in Figure 1, the utility model is by one or more portable, movable wireless transmitter 10, and cooperation is installed near one or more receivers 20 or far-end control command centre with it, can form corresponding image transmission, make between the scene of the accident and the commanding in the rear control centre, and the different azimuth of the scene of the accident, between the place, can realize real-time image transmitting, thereby greatly improve the means of communication, improve the operating efficiency of rescue and relief work.
Particularly, as shown in Figure 2, in transmitter 10, carry out compressed encoding by the vision signal of 11 pairs of inputs of image compression encoding circuit first and process, the compressed video signal of being exported by 12 pairs of compressed encoding circuit of spectrum spreading circuit again carries out spread processing, then outputs to the radiating circuit 13 of its back; The concrete composition of described radiating circuit 13 is shown in dotted line frame among Fig. 2, wherein, the signal of spectrum spreading circuit 12 being exported by modulation circuit 131 is modulated into intermediate-freuqncy signal, intermediate-freuqncy signal frequency-conversion processing after will being modulated by transmitting terminal frequency changer circuit 132 again is high-frequency signal, then transmitting terminal amplifying circuit 133 amplifies, and delivers to transmitting antenna 135 again it is launched.
As shown in Figure 3, in receiver 20, first by receiving circuit 23 receiver/transmitter 10 signals that send, separate the spread spectrum processing by separating 22 pairs of signals of receiving of spectrum spreading circuit again, and then carry out decompression by image decompression decoding circuit 21, reduction and outputting video signal; The concrete composition of described receiving circuit 23 is shown in dotted line frame among Fig. 3, wherein, by reception antenna 235 receiver/transmitter 10 high-frequency signals that send, amplified by 234 pairs of high-frequency signals of receiving of receiving terminal amplifying circuit again, then carry out frequency-conversion processing with the output intermediate-freuqncy signal by 232 pairs of high-frequency signals of receiving terminal frequency changer circuit, again by demodulator circuit 231 with the intermediate-freuqncy signal demodulation process and output to the solution spectrum spreading circuit 22 of its back.
As can be seen from Figure 4, for further being convenient to the transmission of vision signal, a network interface circuit in that the output of image decompression decoding circuit 21 also connects can be used for the vision signal that image decompression decoding circuit 21 is exported is outputed to external network.
Further, between the described transmitting terminal amplifying circuit 133 and transmitting antenna 135 in the radiating circuit 13 of described transmitter 10, also be connected to a transmitting terminal bandwidth-limited circuit 134 that is used for described transmitting terminal amplifying circuit 133 output high-frequency signals are carried out bandpass filtering treatment.And, between the described receiving terminal amplifying circuit 234 and receiving terminal frequency changer circuit 232 in the receiving circuit 23 of described receiver 20, also be connected to a receiving terminal bandwidth-limited circuit 233 that is used for the high-frequency signal of described receiving terminal amplifying circuit 234 outputs is carried out bandpass filtering treatment.
Each part in radiating circuit 13 of the present utility model and the receiving circuit 23 all is existing mature technology, and therefore following is introduced other several circuit.
Paper image compression encoding circuit 11 and image decompression decoding circuit 21: owing to containing much information of image in the vision signal, the transmission bandwidth that takies memory capacity and requirement is large especially, therefore at first to carry out the Efficient Compression coding to it, to reach the image compression of extremely low code check, guarantee simultaneously image basic loss of information not in transmission course.In addition, also require image compression can not be too responsive to error code, can adapt to the wireless channel transmission high bit-error, the time become the problem such as multipath, and cost can not be too high.
For this reason, adopt existing MPEG-4 image compression encoding and decoding technique (MPEG in the present embodiment, being Motion Picture Experts Group, is the compression standard of the larger live image of a kind of compression ratio and sound), and adopt corresponding ASIC (application-specific integrated circuit (ASIC)) chip.Adopt the TriMedia PNX1311EH chip of Philips company to finish the MPEG4 codec functions in the present embodiment, and adopt SAA7111 video a/d chip that vision signal is converted to digital signal), adopt SAA7121 to carry out video d/a conversion and format conversion, become the output of the TV signal of the NSC/PAL standard that meets international standard, to realize analog image collection, digitlization and complicated extensive compressed encoding computing.Its image resolution ratio can reach 352 * 288 pixel/frame (CIF form), and speed can reach for 25 frame/seconds, real-time Transmission dynamic image respond well, and without " animation " sensation, clear picture, " action " agility can satisfy the needs that scene of the accident realtime graphic transmits.
Then introduce spectrum spreading circuit 12 and separate spectrum spreading circuit 22: when information is transmitted, require to have higher communication quality under wireless channel conditions; Particularly under the abominable geography in the scene of the accident, electromagnetic environment, require communication port to have stronger anti-interference and ability anti-fading, anti-multipath.Common non-spreading channel is difficult to satisfy above-mentioned requirements.Therefore, adopt existing spread spectrum technic in the present embodiment, carry out band-spread wireless digital in 336 ~ 344MHz frequency range, and adopt high-speed figure to process (DSP) technology and FPGA Integrated design, to realize high performance spectrum spreading circuit 12 designs, its circuit design integrated level is high, good reliability.Channel speed can carry out flexible configuration as requested from 512Kbps ~ 1Mbps.
Adopt direct sequence spread spectrum skill in the present embodiment, in the spectrum spreading circuit 12 of transmitter 10, the signal that will send expands on the very wide frequency band with two-forty pseudo noise code (spreading code); In the solution spectrum spreading circuit 22 of receiver 20, with identical pseudo noise code the signal of receiving is carried out relevant treatment, recover original signal.
After adopting above-mentioned spectrum spreading circuit 12, interference power can be expanded to very wide frequency band and get on, the interference power of entering signal frequency band be reduced greatly, thereby make whole device have stronger antijamming capability; Because the signal spectrum after the direct sequence spread spectrum is very wide, the sub-fraction decline is little on the impact of whole signal, so the anti fading performance of whole device is good, particularly the performance of anti-frequency selective fading is fine; Simultaneously, the correlation properties of direct sequence spread spectrum skill pseudo-code can work system under the environment with a varied topography such as city, and the performance that anti-multipath disturbs is fine; In addition, can make whole device have very strong disguise and the ability of anti-intercepting and capturing, have stronger level security.
Introduce at last network interface circuit: the transmitter 10 that this is practical and the effective propagation path between the receiver 20 are about 10 kilometers, in some major accident, on-the-spot realtime graphic information need to be sent to farther place, all advantages of Internet-based, best bet is to carry out remote transmission by existing network, realize the Internet Transmission of digitized video, can adopt the IP technology of the present most widely used network transmission protocol, the code stream that video compression coding is formed adapts to interface and the protocol architecture thereof that Internet Transmission requires.For this reason, adopt the Ethernet interface 10BASE/l00BASE-T of present extensive use in the present embodiment, for example utilize the RTL8019AS of Realtek company that physical layer interface is provided, network upper-layer protocol family content is then realized by dsp software, can finish the digital network transmission that realizes video.Simultaneously, also adopted the wireless lan interfaces circuit in the present embodiment, receiver 20 can directly be connected with WLAN (wireless local area network) (WLAN), the video information of receiving to long-range transmission by WLAN (wireless local area network).
Like this, can carry out by means of existing computer network system the real time remote transmission of scene of the accident image, as passing through LAN (Local Area Network) (LAN), wide area network (WAN) and the Internet (Intemet) carry out the transmission of image file and browse, the remote transmission problem is converted into the image file (or saying Streaming Media) after the compression, be that image compression encoder can directly access Intranet, even Intemet, the user who is authorized to (for example controlling command centre) can in the online of the office of this locality, also can long-range online carry out picture browsing and on-site supervision.
Being the utility model preferred embodiment only in sum, is not to limit practical range of the present utility model.Be that all equivalences of doing according to the content of the utility model claim change and modification, all should belong to technology category of the present utility model.
Claims (10)
1. the image transmission based on Technology of Wireless Spread Spectrum comprises backpack transmitter and the receiver that cooperates with it, it is characterized in that:
Described transmitter comprises image compression encoding circuit, spectrum spreading circuit and the radiating circuit that in turn communication connects; Wherein, the image compression encoding circuit carries out compressed encoding to the vision signal of input to be processed with the output squeezing vision signal, the compressed video signal that described spectrum spreading circuit is exported described compressed encoding circuit carries out spread processing, and the signal of described radiating circuit after with spread processing launched;
Described receiver comprises receiving circuit, solution spectrum spreading circuit and the image decompression decoding circuit that in turn communication connects; Wherein, described receiving circuit receives signal that described transmitter sends, the signal that described solution spectrum spreading circuit is exported described receiving circuit is separated spread spectrum and is processed, and the signal that described image decompression decoding circuit is exported described solution spectrum spreading circuit carries out decompression with reduction and outputting video signal.
2. the image transmission based on Technology of Wireless Spread Spectrum according to claim 1, it is characterized in that: also comprise the modulation circuit that the signal after the spread processing is modulated into intermediate-freuqncy signal in the radiating circuit of described transmitter, be the transmitting terminal frequency changer circuit of high-frequency signal with the intermediate-freuqncy signal frequency-conversion processing after the described modulation, the transmitting terminal amplifying circuit that described high-frequency signal is amplified, and the transmitting antenna launched of the high-frequency signal after will amplifying.
3. the image transmission based on Technology of Wireless Spread Spectrum according to claim 2, it is characterized in that: between the described transmitting terminal amplifying circuit and transmitting antenna in the radiating circuit of described transmitter, also be connected to a transmitting terminal bandwidth-limited circuit that is used for described transmitting terminal amplifying circuit output high-frequency signal is carried out bandpass filtering treatment.
4. the image transmission based on Technology of Wireless Spread Spectrum according to claim 1, it is characterized in that: also comprise in the receiving circuit of described receiver be used to the reception antenna that receives high-frequency signal that described transmitter sends, the receiving terminal amplifying circuit that received high-frequency signal is amplified, high-frequency signal after amplifying is carried out frequency-conversion processing with output intermediate-freuqncy signal receiving terminal frequency changer circuit, and described intermediate-freuqncy signal demodulation process become digital video signal and output to the demodulator circuit of described solution spectrum spreading circuit.
5. the image transmission based on Technology of Wireless Spread Spectrum according to claim 4, it is characterized in that: between the described receiving terminal amplifying circuit and receiving terminal frequency changer circuit in the receiving circuit of described receiver, also be connected to a receiving terminal bandwidth-limited circuit that is used for the high-frequency signal of described receiving terminal amplifying circuit output is carried out bandpass filtering treatment.
6. the described image transmission based on Technology of Wireless Spread Spectrum of any one in 5 according to claim 1 is characterized in that: also comprise with the output of described uncompressed encoding circuit the network interface circuit that is connected, is used for the vision signal that described uncompressed encoding circuit is exported is outputed to external network in described receiver.
7. the image transmission based on Technology of Wireless Spread Spectrum according to claim 6, it is characterized in that: described network interface circuit comprises ethernet interface circuit and wireless lan interfaces circuit.
8. the image transmission based on Technology of Wireless Spread Spectrum according to claim 6, it is characterized in that: described compressed encoding circuit is the MPEG-4 condensing encoder; Described uncompressed encoding circuit is MPEG-4 uncompressed encoding device.
9. the image transmission based on Technology of Wireless Spread Spectrum according to claim 6, it is characterized in that: described spectrum spreading circuit is the direct sequence spread spectrum circuit, described solution spectrum spreading circuit is direct sequence solution spectrum spreading circuit.
10. the image transmission based on Technology of Wireless Spread Spectrum according to claim 6, it is characterized in that: the operating frequency of described transmitter and receiver is the 336-344MHz frequency range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220370483 CN202696806U (en) | 2012-07-30 | 2012-07-30 | Image transmission device based on wireless spectrum spread technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220370483 CN202696806U (en) | 2012-07-30 | 2012-07-30 | Image transmission device based on wireless spectrum spread technology |
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| CN202696806U true CN202696806U (en) | 2013-01-23 |
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| CN 201220370483 Expired - Fee Related CN202696806U (en) | 2012-07-30 | 2012-07-30 | Image transmission device based on wireless spectrum spread technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112821962A (en) * | 2021-04-19 | 2021-05-18 | 江西锦源自动化技术有限公司 | Underwater wireless communication system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112821962A (en) * | 2021-04-19 | 2021-05-18 | 江西锦源自动化技术有限公司 | Underwater wireless communication system |
| CN112821962B (en) * | 2021-04-19 | 2021-06-25 | 江西锦源自动化技术有限公司 | Underwater wireless communication system |
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Legal Events
| Date | Code | Title | Description |
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| 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: 20130123 Termination date: 20150730 |
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| EXPY | Termination of patent right or utility model |