CN101031076B - System for transmitting in digital AV wireless frequency-extending region - Google Patents
System for transmitting in digital AV wireless frequency-extending region Download PDFInfo
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- CN101031076B CN101031076B CN 200710021326 CN200710021326A CN101031076B CN 101031076 B CN101031076 B CN 101031076B CN 200710021326 CN200710021326 CN 200710021326 CN 200710021326 A CN200710021326 A CN 200710021326A CN 101031076 B CN101031076 B CN 101031076B
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Abstract
The system comprises: an audio/video signal source, a first transceiver, a second transceiver and an audio/video terminal. Said audio/video signal source makes A/D conversion for audio/video signals and sends them to the first transceiver that transmits the received audio/video signals to the second transceiver by using wireless way; the second transceiver makes D/A conversion for the received signals and sends them to the audio/video terminal.
Description
Technical field
What the present invention relates to is transmission system, more particularly, the present invention relates to a kind of system for transmitting in digital AV wireless frequency-extending region.
Background technology
In environment such as original family and production, the use of video terminal all needs to connect signal by wire cable, and promptly the position of video reception is subjected to the restriction of vision signal source position.Vision signal is an analog signal simultaneously, and bandwidth is big, and wireless transmission almost can't guarantee the video of high efficiency and high definition.
Along with the development of digital television techniques and Radio Transmission Technology, the digital applications of home audio-visual devices may become.On display packing, the technological break-through of large-screen, frivolous, flat panel display applications aspect makes the application form of television terminal by huge thick and heavy, has become light and handy nimble.Because the lighting of display terminal, the diversity of video user demand, changeability, and the particularity of Video Applications environment or the like, all to can in certain zone, adopting the mode of wireless connections to come the AV signal application in receiving video signals source to propose demand widely flexibly, easily.
Along with development of wireless communication devices, the especially continuous development and the application of wideband digital wireless communication technology, in conjunction with the development of AV digitizing technique, the inventor has developed regional AV transmission system.System will combine current frivolous digital video display device and use, and greatly satisfy the demand in family wireless Digital Image Transmission field.
Summary of the invention
In order to summarize purpose of the present invention, some aspect of the present invention, advantage and novel feature have been described here.Should be appreciated that, need not all these aspects, advantage and feature and be included among arbitrary special embodiment.
System for transmitting in digital AV wireless frequency-extending region of the present invention is the wireless channel that utilizes 2.4GHz, the novel system of transmission of digital compressed image and audio frequency.
Technical scheme of the present invention is:
A kind of system for transmitting in digital AV wireless frequency-extending region, it comprises: audio-video signal source, transceiver one, transceiver two, audio-video terminal, wherein, the audio-video signal source is sent to transceiver one after with audio-video signal modulus or digital-to-analogue conversion, transceiver one sends to transceiver two by wireless transmission method with audio-video signal, and transceiver two is sent to audio-video signal on the audio-video terminal after modulus or digital-to-analogue conversion and reduces.
Above-mentioned system for transmitting in digital AV wireless frequency-extending region, it is further characterized in that this system adopts MPEG2 numeral AV signal processing technology: audio A/D, D/A adopt PCM1800E and PCM1716E to realize the modulus or the digital-to-analogue conversion of audio signal respectively.The video a/d chip is converted into Y:U:V=4 with the different systems analog video signal: 2: 2 digital signal, digital video coding are output as 8 bit data streams of CCIR-656 form; The D/A chip then converts the digital video signal of CCIR-656 to simulation output, and image output size can be ITU-R 601, CIF, forms such as QCIF.Utilize in the system design MPEG2 process chip with the digital video signal of CCIR-656 with carry out encoding and decoding based on the vision signal of 4: 2: 0 standards of standards such as the main profile at main level of MPEG-2 or MP@SP and handle, simultaneously the digital audio and video signals of input is carried out encoding and decoding by MPEG-1Layer II form and handles.
Above-mentioned system for transmitting in digital AV wireless frequency-extending region, it is further characterized in that, system design adopted advanced person's direct sequence spread spectrum (DSSS) wireless broadband transmission technology, and fully used the spread spectrum transmission technical standard of ripe 2.4GHz, not only can satisfy the relevant wireless transmission index request of ISM frequency spectrum planning, and the wideband digital that can satisfy effectively under the MPEG2 quality assurance prerequisite spreads out of performance requirement.Baseband processing chip is RF3002, and the rf modulations chip is RF2958, and power amplifier is RF5189.Realize half-duplex transmission in the wireless transmission simultaneously, receiving terminal can oppositely be controlled the signal source input of transmitting terminal, wireless frequency switching controls.
Beneficial effect of the present invention:
Society is to flexible wireless video transmission requirements ubiquity now, the development and the extensive use of especially current frivolous flat panel display terminal and wireless broadband transmission technology, and the expansion of field of video applications and scope, make the Video Applications of the such target of realization become the extensive trend that may and become Video Applications.The frequency spectrum planning standard of international and China has been followed in the design of native system, system design has comprehensive, advance and the functional diversity on possessing skills, following extensive use for system product, deepen continuously and improve exploitation, all there is actively long-range meaning aspects such as multi-field expansion application.
Description of drawings
Fig. 1 is the system for transmitting in digital AV wireless frequency-extending region transmitting-receiving schematic diagram of the embodiment of the invention;
Fig. 2 is the transmitting terminal principle schematic of the embodiment of the invention;
Fig. 3 is the receiving terminal principle schematic of the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described.
System for transmitting in digital AV wireless frequency-extending region is to utilize the wireless channel of frequency for 2.4GHz, the novel system of transmission of digital compressed image and audio frequency.
The design object and the function of product systems that the present invention researches and develops are: adopt advanced wireless frequency expansion wideband digital transmission technology, and the digitlization MPEG2 coding techniques of analogue AV signal, realize MPEG2 digitlization AV wireless transmission of signal and reception in the small area.
At the trend of zonule WiMAX multimedia communication application demand development, the design work of system for transmitting in digital AV wireless frequency-extending region product systems overall technical architectures has been finished in the invention.
As shown in Figure 1, receive and dispatch schematic diagram for the system for transmitting in digital AV wireless frequency-extending region of the embodiment of the invention.The system for transmitting in digital AV wireless frequency-extending region of present embodiment, it comprises: the audio-video signal source, for example camera, DVD etc., transceiver one, transceiver two, audio-video terminal, for example display, LCD etc., wherein, the audio-video signal source is sent to transceiver one after with audio-video signal modulus or digital-to-analogue conversion, transceiver one sends to transceiver two by wireless transmission method with audio-video signal, and transceiver two is sent to audio-video signal on the audio-video terminal after modulus or digital-to-analogue conversion and reduces.
Fig. 2 is that transmitting terminal principle schematic, Fig. 3 are the receiving terminal principle schematic.
1., MPEG2 numeral AV signal processing technology
Digitlization AV treatment technology is current AV technology trend, and wherein MPEG2 is the digital AV coding method of at present extensive use, comprise the various aspects such as storage, broadcasting and processing of digital AV, therefore, the inventor has followed this technology application development route in the invention.
Audio A/D, D/A adopt PCM1800E and PCM1716E to realize the modulus or the digital-to-analogue conversion of audio signal respectively.
Video a/d chip (SAA7114H) is converted into Y:U:V=4 with the different systems analog video signal: 2: 2 digital signal, digital video coding are output as 8 bit data streams of CCIR-656 form.D/A chip (ADV7170) then converts the digital video signal of CCIR-656 to simulation output (can select CVBS, Y/C, YUV, rgb signal), and image output size can be ITU-R 601, CIF, forms such as QCIF.
The MPEG2 process chip (uPD61051) of utilizing NEC Corporation in the system design be with the digital video signal of CCIR-656 with carry out encoding and decoding based on the vision signal of 4: 2: 0 standards of standards such as the main profile at main level of MPEG-2 or MP@SP and handle, simultaneously the digital audio and video signals of input is carried out encoding and decoding by MPEG-1Layer II form and handles.
Flash ROM adopts the AM29LV160B chip, and Sdram adopts the HY57V643220 chip.
FPGA adopts the EP2C5T144C-8 of altera corp.Mainly the TS circulation is turned to the serial data stream of coupling radio frequency chip.Control transmitting-receiving control and two-way signaling is mutual in addition.
2., wireless frequency expansion numeral AV transmission technology
System design adopted advanced person's direct sequence spread spectrum (DSSS) wireless broadband transmission technology, and fully used the spread spectrum transmission technical standard of ripe 2.4GHz, not only can satisfy the relevant wireless transmission index request of ISM frequency spectrum planning, and the wideband digital that can satisfy effectively under the MPEG2 quality assurance prerequisite spreads out of performance requirement.Baseband processing chip is RF3002, and the rf modulations chip is RF2958, and power amplifier is RF5189.
Based on this art designs, on the 20MHz transmission bandwidth that the 2.4GHz of standard delimit, with the DSSS spread spectrum of 10dB spreading gain, the CCK modulation system can realize the wireless code flow transmission capacity of maximum 11MBPS.
Realize half-duplex transmission in the wireless transmission simultaneously.Receiving terminal can oppositely be controlled the signal source input of transmitting terminal, wireless frequency switching controls and other operation etc.
As the wireless information system that new and high technology supports, " system for transmitting in digital AV wireless frequency-extending region " has extremely application prospects, specifically mainly comprises:
1., the AV of family radio play uses, and promptly realizes the wireless penetration that family televises.Native system one end is placed on family's image set platform, promptly connect with CABLE, DVD etc., light television terminal such as the other end and LCD is used, to make that TV watching no longer is subjected to the TV position limit within the family, arbitrarily watch the mobile TV position, avoids inefficient many TV configurations of family.
2., the mobile wireless video programme of businessfice is used, this class programme owing to have provisional and the multiple spot display property, is arranged in advance to need to install and laid vision cable, not only waste time and energy, and can influence image effect, and display position also can be subjected to environmental limit.Adopt native system just can be very quick, efficient, high-quality, realize multipoint video programme in the zone flexibly.
3., industry, military affairs, education or the like all kinds of departments, in the time of need be to the mobile wireless image monitoring of interim environment and object, not only have provisionally, and the restriction of a lot of actual environments aspect is often arranged, make system wiring very difficult, obviously native system has great using value.
4., making field such as radio and television, the image wireless surveillance application of floor, the especially open-air cable of taking is laid application under the environmental condition of inconvenience.
Though the present invention with preferred embodiment openly as above; but they are not to be used for limiting the present invention; anyly be familiar with this skill person; without departing from the spirit and scope of the invention; from when can doing various variations or retouching, so being as the criterion of should being defined with the application's claim protection range of protection scope of the present invention.
Claims (1)
1. system for transmitting in digital AV wireless frequency-extending region, it comprises: audio-video signal source, transceiver one, transceiver two, audio-video terminal, it is characterized in that, the audio-video signal source is sent to transceiver one after with audio-video signal modulus or digital-to-analogue conversion, transceiver one sends to transceiver two by wireless transmission method with audio-video signal, and transceiver two is sent to audio-video signal on the audio-video terminal after modulus or digital-to-analogue conversion and reduces;
Audio A/D, D/A adopt PCM1800E and PCM1716E to realize the modulus or the digital-to-analogue conversion of audio signal respectively;
The video a/d chip is converted into the digital signal of Y:U:V=4:2:2 with the different systems analog video signal, and digital video coding is output as 8 bit data streams of CCIR-656 form; The D/A chip then converts the digital video signal of CCIR-656 to simulation output, and the form of image output is ITU-R 601, CIF, one of form of QCIF;
Utilize the MPEG2 process chip with the digital video signal of CCIR-656 with carry out encoding and decoding based on the vision signal of the 4:2:0 standard of the main profile at main level of MPEG-2 or MP@SP standard and handle, simultaneously the digital audio and video signals of input is carried out encoding and decoding by MPEG-1 Layer II form and handles;
Described wireless transmission method is to adopt advanced direct sequence spread spectrum (DSSS) wireless broadband transmission technology, the spread spectrum transmission technical standard of 2.4GHz, and baseband processing chip is RF3002, and the rf modulations chip is RF2958, and power amplifier is RF5189;
Realize half-duplex transmission in the described wireless transmission, receiving terminal can oppositely be controlled the signal source input of transmitting terminal, wireless frequency switching controls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200710021326 CN101031076B (en) | 2007-04-06 | 2007-04-06 | System for transmitting in digital AV wireless frequency-extending region |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200710021326 CN101031076B (en) | 2007-04-06 | 2007-04-06 | System for transmitting in digital AV wireless frequency-extending region |
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| CN101031076A CN101031076A (en) | 2007-09-05 |
| CN101031076B true CN101031076B (en) | 2011-01-19 |
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| CN 200710021326 Expired - Fee Related CN101031076B (en) | 2007-04-06 | 2007-04-06 | System for transmitting in digital AV wireless frequency-extending region |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185624A (en) * | 2011-04-26 | 2011-09-14 | 杭州神弓电子实业有限公司 | Radio signal transmitter-receiver |
| TWI449430B (en) * | 2011-08-01 | 2014-08-11 | Hides Inc | High - bandwidth audio and video transmission processing system |
| CN111031288B (en) * | 2019-12-24 | 2021-10-08 | 中国兵器装备集团自动化研究所有限公司 | Real-time video acquisition system and method based on wireless transmission |
| CN112839209A (en) * | 2021-01-19 | 2021-05-25 | 大连理工大学 | RF passive video monitoring system and monitoring method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1432245A (en) * | 2000-06-02 | 2003-07-23 | 英特赛尔公司 | Double information packet configuration of radio communication |
| CN1543215A (en) * | 2003-04-28 | 2004-11-03 | 联想(北京)有限公司 | A home multimedia system |
| CN1588990A (en) * | 2004-08-18 | 2005-03-02 | 友达光电股份有限公司 | Image playing system and its method |
| CN1632860A (en) * | 2004-12-10 | 2005-06-29 | 邓学锋 | Method for preventing virus by adding watermark to digital audio information |
| CN1891004A (en) * | 2003-12-03 | 2007-01-03 | 英国电讯有限公司 | Communications method and system |
| CN1893417A (en) * | 2005-07-06 | 2007-01-10 | 邓学锋 | Internal and external network information safety transmission system and method |
-
2007
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1432245A (en) * | 2000-06-02 | 2003-07-23 | 英特赛尔公司 | Double information packet configuration of radio communication |
| CN1543215A (en) * | 2003-04-28 | 2004-11-03 | 联想(北京)有限公司 | A home multimedia system |
| CN1891004A (en) * | 2003-12-03 | 2007-01-03 | 英国电讯有限公司 | Communications method and system |
| CN1588990A (en) * | 2004-08-18 | 2005-03-02 | 友达光电股份有限公司 | Image playing system and its method |
| CN1632860A (en) * | 2004-12-10 | 2005-06-29 | 邓学锋 | Method for preventing virus by adding watermark to digital audio information |
| CN1893417A (en) * | 2005-07-06 | 2007-01-10 | 邓学锋 | Internal and external network information safety transmission system and method |
Non-Patent Citations (1)
| Title |
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| CN 1891004 A,全文. |
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Application publication date: 20070905 Assignee: JIANGSU AUSTIN OPTRONICS TECHNOLOGY Co.,Ltd. Assignor: Shunpu Electronic Co., Ltd., Nanjing Contract record no.: 2013320000468 Denomination of invention: System for transmitting in digital AV wireless frequency-extending region Granted publication date: 20110119 License type: Exclusive License Record date: 20130529 |
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Granted publication date: 20110119 Termination date: 20210406 |