CN201435790Y - Wireless multi-carrier vehicle bidirectional audio-video and data transmission device - Google Patents
Wireless multi-carrier vehicle bidirectional audio-video and data transmission device Download PDFInfo
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- CN201435790Y CN201435790Y CN 200920130859 CN200920130859U CN201435790Y CN 201435790 Y CN201435790 Y CN 201435790Y CN 200920130859 CN200920130859 CN 200920130859 CN 200920130859 U CN200920130859 U CN 200920130859U CN 201435790 Y CN201435790 Y CN 201435790Y
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Abstract
The utility model discloses a wireless multi-carrier vehicle bidirectional audio-video and data transmission device, which comprises an emission module. The emission module is connected into video information via a video interface and is connected into IP data via an Ethernet interface; the video interface and the IP data are switched via a switch module; when the switch module is switched to thevideo interface, the video information is converted into a TS flow; when the switch module is switched to the Ethernet interface, the IP data are converted into the TS flow by connecting a TS flow /IPdata converting module; finally, the TS flow is processed by means of encoding, converted into radiofrequency signals and then transmitted through an antenna. By adopting a modulation mode of coded orthogonal frequency division multiplexing, the transmission device overcomes multi-path interference, lowers bite error rate, and ensures videos, audios and data to realize stable wireless transmission in the environment of high-speed movement and obstacles.
Description
Technical field:
The utility model relates to wireless communication field, and that be specifically related to is third generation communication technology TDS-OFDM/COFDM (multi-carrier modulation technology), MPEG2 video coding technique and based on Ethernet interface, the device of wireless transmission IP data and video.This device can be in high-speed mobile and the city block the full duplex real time bidirectional transmission that realizes Ethernet data and high definition audio frequency and video under the situation, for emergency command and accident provide on-site supervision.
Background technology:
At present, wireless transmission method roughly has numeral/network radio station, GSM/GPRS, CDMA, digital microwave, spread spectrum microwave, wireless network etc., and advantage and the defective of self should various technical systems be all arranged.Substantially: numeral/network radio station price is low, adopts frequency hopping more, but is essentially single-carrier modulated, and effective transmission speed is generally at 100-300Kbps, video image that can't high quality.
GSM/GPRS, CDMA are mobile communication public network technology, and technology is very ripe, but transmission rate is generally in the 100Kbps level, image that also can't high quality.
Digital carrier, spread spectrum microwave can provide high-rate link, but are the single-carrier modulated technical system, can not use in stopping environment and in moving.
On the other hand, the radio transmission apparatus major part all is single transmission tone video or data at present.In real world applications, because the command centre that a lot of departments such as public security, People's Armed Police, fire-fighting, health, environmental protection, broadcasting and TV, frontier defense and unit all need simultaneously hdtv video image, voice or Ethernet data with the accident scene to be sent to far-end in real time monitors and commands.Adopt existing single ANTENN AUDIO or video or data transmission set, can't finish voice, data, high quality graphic real-time Transmission comprehensive function; Can't satisfy in moving the way or stop under the environment and carry out the transmission of Information requirement with two-forty.
Summary of the invention:
For addressing the above problem, the purpose of this utility model is to be to provide a kind of full duplex real time bidirectional transmission equipment that can realize high speed wireless data " in the high-speed motion ", " non-looking under the poker spare ", finishes in the motion integrated service such as voice, data, high quality graphic transmitted in both directions up hill and dale.
For achieving the above object, the utility model mainly adopts following technical scheme:
The vehicle-mounted two-way audio frequency and video of a kind of wireless multi-carrier, data transmission device include:
One transmitter module, this transmitter module inserts video information by video capture device, and this video information is changed into the TS video flowing;
One IP data/TS stream translation module link to each other with transmitter module, the TS video flowing can be carried out encoding process, change into radiofrequency signal, send by wireless network interface, and by wireless network interface received RF signal, this radiofrequency signal are changed into the TS video flowing;
One TS stream/IP data conversion module links to each other with receiver module, can receive the TS video flowing, and decodes and change into the IP data.
One receiver module links to each other with TS circulation ethernet module, can receive the TS video flowing, and decodes and change into video information.
It also includes a two-way MPEG-2 codec, is used to realize the transmission of the video/audio of two-way DVD form.
What described TS circulation ethernet module adopted is the modulation system of OFDM.
Described receiver module links to each other with external video display apparatus.
The beneficial effects of the utility model are: the TDS-COFDM modulation technique has overcome multipath to be disturbed and to have reduced the error rate, can guarantee that video, voice-and-data realize stable wireless transmission in high-speed mobile and the environment that stops; There are two kinds of patterns (being switched by easy toggle switch control) in this system, a kind of is high definition bidirectional picture transmission mode, can be used as vehicle-carried mobile two-way video conferencing function, another kind of pattern is the two-way Ethernet data of transmission, and transmission code stream is 4Mbps, can be used as the computer high, realize global function (data, voice, network video server, networking telephone or the like function) transmitted in both directions.And the utility model has simultaneously and sends and receiving function, can use identical equipment with receiving terminal sending, and greatly reduces application cost.
Description of drawings:
Fig. 1 is a system block diagram of the present utility model.
Fig. 2 is the utility model signal flow graph.
Fig. 3 is the utility model systematic schematic diagram
Embodiment:
What TS circulation ethernet module adopted in the utility model is the modulation system of TDS-COFDM (OFDM), overcome the multipath interference and reduced the error rate, can guarantee that video, voice-and-data realize stable wireless transmission in high-speed mobile and the environment that stops, and transmit and receive module, but so the audio frequency and video image and the Ethernet data of high quality to Video signal processing employing MPEG2 video coding technique.
Below in conjunction with the drawings and specific embodiments the utility model is described in further details.
As shown in Figure 1, the utility model is the vehicle-mounted two-way audio frequency and video of a kind of wireless multi-carrier, data transmission device, includes:
Transmitter module, this transmitter module can insert audio/video and data acquisition equipment by input port, as microphone, video camera, IP phone, notebook computer etc., collecting device is input to transmitter module with audio frequency and video and the data message that collects by cable, transmitter module carries out the MPEG2 encoding process to this video information, make it to produce the TS video or the data flow of high definition, and this TS audio frequency and video/data flow is transported to TS circulation ethernet module.
TS circulation ethernet module adopts the TDS-COFDM modulation system to modulate above-mentioned TS audio frequency and video/data flow, and changes into radiofrequency signal and launch.
Two kinds of patterns of this system are switched by easy toggle switch control, and a kind of is high definition bidirectional picture transmission mode; Another kind of pattern is the two-way Ethernet data of transmission.As shown in Figure 2, when radiofrequency signal sends, also can receive outside wireless signal, and send this wireless signal to TS circulation ethernet module, TS circulation ethernet module then changes into the TS video flowing with this signal, again this TS video flowing is sent to receiver module, described receiver module then carries out decoding processing to this TS video flowing, output audio frequency and video/data message.
Audio frequency and video/the data message of receiver module output shows as computer, display, television set etc. by outside identification equipment, and then realize simultaneously show audio frequency and video/data message at transmitting terminal and receiving terminal this moment, thereby reach the effect of synchronous demonstration.
Wherein adopt the two-forty bidirectional data transmission system of TDS-COFDM multi-carrier modulation technology, in moving and practical communication speed can be up to 4Mbps (QPSK) under non line of sight (blocking) environment, flank speed can reach 28Mbps (64QAM), be 150 times of present CDMA1X mobile communications network actual transfer rate, higher 300 times than GPRS mobile communication rate actual transfer rate, also higher more than 2 times than the peak-peak speed of present 3G network; In addition, this device signal cover is big, and communication distance can be up to 50 kilometers under view distance environment, and communication range can be up to the 5-20 kilometer under non line of sight (blocking) environment.
As shown in Figure 2, Fig. 2 is the utility model signal flow graph.At first signal AV1 directly launches by antenna T after by the two-way vehicle-mounted machine of COFDM Ethernet, corresponding filter amplifier 1 then receives it by antenna R, and be input to the two-way indoor set of COFDM Ethernet by radio frequency 1, then directly export after treatment by AV1; The AV2 signal then is input to the two-way indoor set of COFDM Ethernet, output to the two-way off-premises station of COFDM Ethernet through RF then, and send by antenna T, corresponding filter amplifier 1 and filter amplifier 2 receive this signal, be input to the two-way vehicle-mounted machine of COFDM Ethernet by RF1, RF2 respectively, then directly export AV2 after treatment.
All be provided with the LAN mouth in two-way vehicle-mounted machine of COFDM Ethernet and the two-way indoor set of COFDM Ethernet, can realize being connected, information such as received video, data are sent timely with network by the LAN mouth.
As shown in Figure 3, Fig. 3 is the utility model systematic schematic diagram.At first audio-video signal is by MPEG2/MPEG4 coding input TS stream; this TS stream carries out the RS coding by scrambler and outputs to external interleaver; handle the back interleaver through convolutional encoding; then shine upon the formation frame data afterwards; mix pilot tone and TPS signal this moment with described frame data; insert at interval to protection through IFFT, go out by antenna transmission after D/A conversion and quadrature modulation and the radio frequency processing and amplifying carrying out.
Reception antenna received above-mentioned audio-video signal and amplified by tuner and amplifier this moment, change inclined to one side correction of laggard line frequency at process A/D and be input to the FFT unit, carry out phasing through the signal behind the FFT unit at this moment, carrying out TPS decoding simultaneously, with frame pulse and configuration information output, it is synchronous simultaneously this video information to be carried out timing, and the information is synchronously re-send to tuner by A/D converter.
Then carry out after the channel estimating measuring through the video information behind the phasing and quantize to CITERBI, interweave in separating afterwards, CITERBI decoding, RS is synchronized to and separates outer interweaving, decipher by RS then and carry out descrambling code input TS stream after the processing, enter video information then after these TS streams are decoded through MPEG2/MPEG4.
Here all can control in the input of audio-video signal and the output procedure, and become the IP data to transmit by IP/TS stream translation module converts these signals by switch.
More than the vehicle-mounted two-way audio frequency and video of a kind of wireless multi-carrier provided by the utility model, data transmission device are described in detail, used specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (4)
1, the vehicle-mounted two-way audio frequency and video of a kind of wireless multi-carrier, data transmission device is characterized in that including:
One transmitter module, this transmitter module inserts video information by video interface, and this video information is changed into the TS video flowing; Insert the IP data by the Ethernet data interface;
One switch module, this module is switched video interface and Ethernet interface;
One IP data/TS stream translation module link to each other with transmitter module, TS stream can be carried out encoding process, change into radiofrequency signal, send by wireless network interface, and by the antenna received RF signal, this radiofrequency signal are changed into TS stream; Link to each other with receiver module, can receive the TS video flowing, and decode and change into the IP data;
One receiver module when switch module switches to the Ethernet data interface, links to each other with IP data/TS stream translation module, receives TS stream, and decodes and change into the IP data, when switch module switches to video interface, with TS stream decoding output video information;
2, the vehicle-mounted two-way audio frequency and video of wireless multi-carrier according to claim 1, data transmission device is characterized in that also including a two-way MPEG-2 codec, are used to realize the transmission of the video/audio of two-way DVD form.
3, the vehicle-mounted two-way audio frequency and video of wireless multi-carrier according to claim 1, data transmission device is characterized in that: what described TS circulation ethernet module adopted is the modulation system of OFDM.
4, the vehicle-mounted two-way audio frequency and video of wireless multi-carrier according to claim 1, data transmission device, it is characterized in that: described receiver module links to each other with external video display apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200920130859 CN201435790Y (en) | 2009-04-17 | 2009-04-17 | Wireless multi-carrier vehicle bidirectional audio-video and data transmission device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200920130859 CN201435790Y (en) | 2009-04-17 | 2009-04-17 | Wireless multi-carrier vehicle bidirectional audio-video and data transmission device |
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| CN201435790Y true CN201435790Y (en) | 2010-03-31 |
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| CN 200920130859 Expired - Fee Related CN201435790Y (en) | 2009-04-17 | 2009-04-17 | Wireless multi-carrier vehicle bidirectional audio-video and data transmission device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102215371A (en) * | 2010-04-02 | 2011-10-12 | 宁波Gqy视讯股份有限公司 | Coded orthogonal frequency division multiplexing (COFDM)-technology-based wireless mobile video conference system |
| CN103002325A (en) * | 2012-12-20 | 2013-03-27 | 湖南纽曼数码科技有限公司 | Vehicle-mounted device for transmitting digital video/audio signals by using twisted pair |
| CN106060449A (en) * | 2016-07-15 | 2016-10-26 | 厦门理工学院 | Information transmission measurement and control system and method suitable for video intercom system |
-
2009
- 2009-04-17 CN CN 200920130859 patent/CN201435790Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102215371A (en) * | 2010-04-02 | 2011-10-12 | 宁波Gqy视讯股份有限公司 | Coded orthogonal frequency division multiplexing (COFDM)-technology-based wireless mobile video conference system |
| CN103002325A (en) * | 2012-12-20 | 2013-03-27 | 湖南纽曼数码科技有限公司 | Vehicle-mounted device for transmitting digital video/audio signals by using twisted pair |
| CN103002325B (en) * | 2012-12-20 | 2015-11-11 | 湖南纽曼数码科技有限公司 | A kind of mobile unit utilizing Double-strand transmission digital audio-video signal |
| CN106060449A (en) * | 2016-07-15 | 2016-10-26 | 厦门理工学院 | Information transmission measurement and control system and method suitable for video intercom system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100331 Termination date: 20110417 |