CN101155089A - Wireless multimedia real-time learning system and method - Google Patents
Wireless multimedia real-time learning system and method Download PDFInfo
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- CN101155089A CN101155089A CNA2006100323499A CN200610032349A CN101155089A CN 101155089 A CN101155089 A CN 101155089A CN A2006100323499 A CNA2006100323499 A CN A2006100323499A CN 200610032349 A CN200610032349 A CN 200610032349A CN 101155089 A CN101155089 A CN 101155089A
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Abstract
The invention provides a real-time studying system and method of wireless multimedia, referring to real-time embedded type stream media technique based on wireless network. The system is composed of a main control server, a stream media server, a wireless network AP meeting point and a mobile studying terminal. The two servers are connected with each other by a wired Ethernet. The mobile studying terminal is interlinked with the said two servers using wireless network. The main control server manages the user logging validation and the system alternation control. The stream media server maintains the study source and data and collects the data to produce the real-time stream media data issuance. The wireless network AP meeting point provides communication function of the mobile studying terminal and the said server. The mobile studying terminal is and portable embedded device and is interlinked with the said two servers using wireless network to alternate with the stream media. The invention has features of simple operation interface, low cost, convenient disposal, large capacity, rich interface, applicable for a great variety of application, in order to perform individuation study. The system can be used in university teaching, cooperation teaching and referring and so on.
Description
Technical field
The present invention relates to a kind of development and application of the real-time embedded stream media technology based on wireless network, specifically is a kind of wireless multimedia real-time learning system and method.
Background technology
The main purpose of mobile learning is exactly to utilize the relevant activity of imparting knowledge to students of portable terminal and cordless communication network, comprising study on class, visit teaching resource, course evaluation and test or the like.Realize above-mentioned function, combining between mobile device and the wireless network and between wireless network and the INTERNET is extremely important.The mobile learning scheme mainly contains two kinds: the first utilizes short message service to realize mobile learning; It two is to utilize connection-oriented various service to realize mobile learning.Present stage mainly is based on cable network or GSM note system.Based on the mobile learning system of short message, though its data communication has certain real-time, be not continuous, reflect and be difficult to field condition realize the transmission of multimedia messages and browse fast.Mobile learning based on short message uses mobile phone as main study carrier, but the mobile phone of present stage can not satisfy the application demand based on the mobile learning that connects, and needs exploitation at the new mobile learning carrier of mobile learning environment; And nowadays embedded technology and relevant development platform thereof are more and more abundanter and ripe, and the bandwidth that the communication technology provided is also more and more higher, and this just lays the foundation for the mobile learning based on connection.
Summary of the invention
Use present situation at existing mobile learning, main purpose of the present invention provides a kind of wireless multimedia real-time learning system and method, this invention is based on wireless network and embedded system state-of-the-art technology, in conjunction with stream media technology, provide one not limited by room and time, open, autonomous individualized learning platform, it is simple that it has an operation interface, cost is low, it is convenient to dispose, capacity is big, rich interface, the characteristics that are suitable for multiple application, the learner can select arbitrarily and the program request teaching resource by the mobile studying terminal of carrying, and can improve learner's learning initiative and efficient greatly.
For achieving the above object, the invention provides this connection-oriented mobile learning system: by a main control server based on wireless broadband network, one or more streaming media servers, one or more wireless network AP access point and mobile studying terminal are formed, main control server and streaming media server interconnect by wired ethernet, and mobile studying terminal is by wireless network and above-mentioned two server interconnects; Wherein main control server is used for the control of leading subscriber login authentication, system interaction, and streaming media server is used for image data, makes the issue of real time flow medium data; Wireless network AP access point is responsible for providing the communication function of mobile studying terminal and above-mentioned server; Mobile studying terminal is a kind of hand held device, and by wireless network and server interconnect, it is mutual to carry out Streaming Media.
Further, above-mentioned wireless network is the 802.11b wireless network.
Further, above-mentioned mobile studying terminal is according to the research and development of user's characteristics and makes, uses the INTELPXA255 chip.
Further, above-mentioned mobile studying terminal support is based on the Chinese character coding input method and the SD card plug-and-play feature of touch-screen.
The study miscellaneous function of further, above-mentioned mobile studying terminal record support notes, classroom communication and storage.
The present invention also provides a kind of wireless multimedia real-time learning method that adopts above-mentioned wireless multimedia real-time learning system, one or more streaming media server editor and collection teaching material, main information is teacher's video, give lessons three kinds of audio frequency and courseware contents, and encodes and issue by system requirements; On the main control server user identity is managed, teaching resource is carried out copyright management, and system maintenance and management are carried out in whole platform network operation; Wireless network and above-mentioned server interconnect that last mobile studying terminal provides by wireless network AP access point, acceptance comprise the real-time multimedia of audio frequency, video and the picture information of giving lessons, and carry out alternately with the teacher.
In the said method, can come the expansion service scope,, then can in network coverage, select course resources to learn whenever and wherever possible as long as the user hands mobile studying terminal and the validated user identity is arranged by increasing wireless network AP access point and streaming media server; Simultaneously, also can carry out record notes, classroom communication and storage by above-mentioned mobile studying terminal.
Operation principle of the present invention is, utilize soft, the hardware structure of universal PC, utilize CPU that multi-medium data is carried out encoding and decoding, and finish functions such as transmission control and basic student status management, the function such as management, making, issue of teaching resource is provided, by revising the linux operating system nucleus, increasing wireless network card drives and broadcasts and support, the network accessibility and the SD card that increase embedded system drive, revise graphical interfaces, increase Chinese character coding input method and multimedia decoding support, support the control of streaming media playing and real-time Transmission.
Embedded mobile studying terminal among the present invention can be obtained above-mentioned resource and information by wireless network, contains much information, and can use at any time, is easy to carry, and has real flexibility, opening and mobility.In the deployment of system, with main control server and streaming media server system user information and teaching resource are managed respectively, guaranteed extensibility and stability, and can revise driver and agreement, support multicast path by, support the SD storage card, realize teaching auxiliary function.
The present invention is based on wireless network and embedded system state-of-the-art technology,, provide one can not be subjected to the individualized learning platform room and time restriction, open, autonomous in conjunction with stream media technology.The learner can break away from the constraint of desktop computer, can select arbitrarily and the program request teaching resource by the mobile studying terminal of carrying, and have functions such as the management of corresponding teaching course, student status management, personalized customization study, can improve learner's learning initiative and efficient greatly.
Description of drawings:
Fig. 1 wireless multimedia real-time learning system structure chart
Fig. 2 mobile studying terminal hardware structure diagram
Fig. 3 mobile studying terminal software block diagram
Fig. 4 multimedia system information processing framework
In the accompanying drawing:
1-main control server 2-streaming media server
3-wireless network AP access point 4-mobile studying terminal
Embodiment:
The invention will be further described below in conjunction with drawings and Examples:
Among the present invention, utilize PC as main control server and streaming media server, utilization based on the embedded device of PXA255 processor as mobile studying terminal, and, comprise SDRAM, FLASH, infrared interface/USB interface, audio interface for the PXA255 processor has disposed abundant peripheral interface (as Fig. 2).Linux operating system and the QT graphical interfaces of this terminal operating through reducing and customizing.Mainly finish following content:
● increase CF interface wireless NIC driver, provide based on 802.11b wireless network interconnect function;
● the exploitation Chinese character coding input method, improve the input in Chinese efficient of qt graphical interfaces under the touch-screen input;
● exploitation e-learning software systems, cooperate with server software, realize MPEG-4 decoding, AMR decoding, JPEG decoding function, finish the real time flow medium transmission based on the RCP/RTCP agreement; Mutual with server software, realize functions such as classroom communication and record notes;
● customized development authentication security procedure, system authentication program and power managed program;
As shown in Figure 1: a main control server 1 is made up of PC, by wired ethernet and streaming media server 2 interconnection.Safeguard a database on the main control server 1, mainly user identity is managed, as student user, teacher user, administrator, teaching resource is carried out copyright management, and whole platform network operation is controlled; One or more streaming media server 2 is made up of PC, is responsible for gathering audio frequency, video and the teaching notes information that professor gives lessons, and encodes and issue by system requirements; Wireless network AP access point 3 is responsible for providing the communication function of mobile studying terminal 4 with above-mentioned server; Mobile studying terminal 4 is accepted real-time multimedia (audio frequency, video and the picture) information of giving lessons by wireless network and above-mentioned server interconnect, and carries out alternately with the teacher.
Among the present invention, the overall system multimedia messages is handled framework as shown in Figure 4.The multimedia sources data acquisition is finished on streaming media server with processing, mainly is that teachers' instruction information is gathered.Video, audio frequency and three kinds of data of picture are compressed in requirement by system on server then, are sending according to the Streaming Media host-host protocol; By the control and the UDP transmission of main control server, mobile studying terminal receives above-mentioned stream media information, then respectively three class data are decoded, and the framing playback.
Wireless real time flow medium learning method among the present invention, the user can be with a kind of brand-new learning method, according to the demand of oneself and the study and the plan of interest customization oneself, and the tracking progress.On streaming media server, deposit or gather in real time the teachers' instruction resource, carry out unified management by main control server.Mobile studying terminal is the embedded device of carrying with common PDA function.As long as in the place that wireless network covers, with using this terminal to be connected with main control server by wireless network per family, in case by authentication, the user can enter into selection and the program request that streaming media server carries out the multimedia curricula resource.In case selected corresponding course, stream media information will send to mobile studying terminal in real time for user learning, and user's learning process and record also will be preserved at the streaming media server database accordingly.Characteristics for the use maximum of this terminal are exactly mobility and portability.
Wherein the dirty media delivery effect of wireless network environment is mainly by coding and transmission policy decision.Because real time data is continuous, and packet jitter is recurrent on the network, jitter problem has just become another constraint of recipient: when the firm arrival of data, playback can not begin, recipient's playback that when receiving first data, not will begin in a minute, put into buffer memory but will import data into, this buffer memory is called annular buffer memory, and this buffer memory is operated according to an advanced first dequeue.The recipient is provided with a threshold value K, and this value is bigger than the longest shake time of estimating.During beginning, pending datas such as playback accumulate in buffer memory, and the data in buffer memory are enough play K time quantum.In a single day cache size reaches K unit, and playback just begins, and data are extracted from buffer memory with constant speed.When new grouping arrived, the data in the grouping were added in the buffer memory, and the time delay of short of grouping surpasses K unit, and enough data are used for continuously, not playback interruptedly with regard to having in the buffer memory.At this moment, the recipient also needs a threshold value S is being set.When Network Packet Loss is serious, other situations perhaps appear, cause the arrival rate of playback rate greater than new grouping.Element number will constantly reduce in this time buffer memory, when this quantity just stops to play less than S the time, cushions again, until reaching K unit again.MPEG-4 is 5 groupings of per second in the RTP transmission course.Test through network jitter, and consider the needs of audio-visual synchronization, it is carried out 1 second buffering, just it is accepted buffered gate limit value K and be made as 5.AMR is 50 groupings of per second in the RTP transmission course.Equally it is carried out the buffering in 1 second, K is made as 50 with its threshold value.For jpeg stream, because its sensitivity to continuous broadcast is lower than audio/video flow, its K value is arranged to less, makes it to receive a complete picture and just it is shown.
In addition, the client that runs on mobile studying terminal need receive MPEG-4 video flowing and AMR audio stream simultaneously, and wherein the time synchronized of audio/video flow becomes an important indicator of playback quality:
RTP provides in order to synchronous temporal information---timestamp, according to the entrained timestamp of RTP grouping and the Absolute Time Synchronization information of RTCP grouping, can recover the sampling time of each grouping, can carry out synchronously according to this sampling time:
1. with audio stream as main flow, video flowing is as auxilliary stream.Because the information of giving a lesson contains among teacher's Yu the speech mostly, so can be made as the priority of audio stream the highest.The preferential continuously audio stream of receiving of playing does not take place at network under the situation of packet loss.
2. when audio stream is play, note current in progress grouped time stamps T1, for video flowing provides necessary synchronizing information.
3. when preparing frame of video of playback, at first obtain current preparation and play grouped time stamps T2, itself and T1 are compared, if T2 and T1 then play this frame in same error range.If T2 is leading in time with respect to T1, then wait for.If T2 falls behind in time with respect to T1, then skip this frame.
The labial that realizes audio/video flow by said method is synchronous, for system provides reliable and stable multimedia information stream.
Operating process of the present invention is, the PC of an INTEL Pentium 4 processor is as main control server 1, the PC of an INTEL Pentium 4 processor is all installed winxp operating system as streaming media server, and linux operating system and application software are installed on mobile studying terminal simultaneously.
The first step is opened streaming media server and main control server.
Second step, utilize the teacher to authorize ID to login at the end PC that gives lessons, open the disconnected server interface of giving lessons, carry out the data acquisition of courseware content, teacher's video, audio frequency.
In the 3rd step, open mobile studying terminal linux operating system and graphical interfaces.
The 4th step connected wireless network, and use authority student ID login enters course and selects the interface, selects course to accept.
In the 5th step, mobile studying terminal receives the multi-medium data that server end sends, and plays in real time.
In the 6th step, the user can use functions such as the Chinese character coding input method, classroom notes, e-schoolbag of mobile studying terminal touch-screen.
Claims (7)
1. wireless multimedia real-time learning system, by a main control server (1), one or more streaming media servers (2), one or more wireless network Ap access points (3) and mobile studying terminal (4) are formed, it is characterized in that, main control server (1) interconnects by wired ethernet with streaming media server (2), and mobile studying terminal (4) is by wireless network and above-mentioned two server interconnects; Main control server (1) leading subscriber login authentication, system interaction control; Streaming media server (2) is safeguarded teaching resource and data, and image data, makes the issue of real time flow medium data; Wireless network AP access point (3) provides the communication function of mobile studying terminal (4) with above-mentioned server; Mobile studying terminal (4) is a kind of hand held device, and by wireless network and server interconnect, it is mutual to carry out Streaming Media.
2. wireless multimedia real-time learning system according to claim 1 is characterized in that, described wireless network is the 802.11b wireless network.
3. wireless multimedia real-time learning system according to claim 1 is characterized in that, described mobile studying terminal (4) is according to the research and development of user's characteristics and makes, uses INTEL PXA255 chip.
4. wireless multimedia real-time learning system according to claim 1 is characterized in that, described mobile studying terminal (4) is supported Chinese character coding input method and the SD card plug-and-play feature based on touch-screen.
5. wireless multimedia real-time learning system according to claim 1 is characterized in that, the study miscellaneous function of described mobile studying terminal (4) record support notes, classroom communication and storage.
6. a wireless multimedia real-time learning method is characterized in that, main control server (1) is gone up and safeguarded a database, mainly user identity is managed, and teaching resource is carried out copyright management, and system maintenance and management are carried out in whole platform network operation; One or more streaming media server (2) editor and gather teaching material, main information is teacher's video, give lessons three kinds of audio frequency and courseware contents, and encodes and issue by system requirements; Wireless network and above-mentioned server interconnect that mobile studying terminal (4) provides by wireless network AP access point (3), the real-time multimedia of accepting to comprise audio frequency, video and the picture information of giving lessons, and carry out alternately with the teacher.
7. a kind of wireless multimedia real-time learning method according to claim 6 is characterized in that, increasing wireless network AP access point (3) and streaming media server (2) can the expansion service scope.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986373A (en) * | 2010-10-26 | 2011-03-16 | 大连工业大学 | Teaching experiment system and experimental method suitable for communication type specialties |
| CN102186050A (en) * | 2011-04-26 | 2011-09-14 | 苏州阔地网络科技有限公司 | Webpage-based remote video conference method and system |
| CN102497291A (en) * | 2011-11-30 | 2012-06-13 | 江苏奇异点网络有限公司 | Time counting method for streaming media distance education |
| CN103794098A (en) * | 2014-01-01 | 2014-05-14 | 广州东软科技有限公司 | Intelligent teaching management system |
| CN104020752A (en) * | 2014-06-24 | 2014-09-03 | 南京化工职业技术学院 | Polystyrene teaching factory for teaching and training and chemical equipment thereof |
| CN104485030A (en) * | 2014-12-17 | 2015-04-01 | 天脉聚源（北京）教育科技有限公司 | Method for displaying courseware on intelligent teaching system learning terminal |
| CN104484760A (en) * | 2014-12-17 | 2015-04-01 | 天脉聚源（北京）教育科技有限公司 | Teaching course configuration method and device for intelligent teaching system |
| CN104504948A (en) * | 2014-12-17 | 2015-04-08 | 天脉聚源（北京）教育科技有限公司 | Method and device for displaying pushed course for intelligent teaching system |
| CN104994081A (en) * | 2015-02-10 | 2015-10-21 | 阔地教育科技有限公司 | Data flow control system, data flow control equipment and terminal |
| CN105225557A (en) * | 2014-09-02 | 2016-01-06 | 山东轻工职业学院 | A kind of mobile interactive teaching platform |
| CN105516137A (en) * | 2015-12-08 | 2016-04-20 | 英业达科技有限公司 | Certification system of learning platform and method thereof |
| CN105975520A (en) * | 2016-04-29 | 2016-09-28 | 东北大学 | System and method for customizing flexibly configured individualized learning scheme |
| CN106683525A (en) * | 2016-11-16 | 2017-05-17 | 凌涛 | Practical teaching support platform in real scene |
| CN111009163A (en) * | 2019-12-17 | 2020-04-14 | 上海墨说科教设备有限公司 | Bidirectional interactive teaching method and system |
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2006
- 2006-09-29 CN CNA2006100323499A patent/CN101155089A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986373A (en) * | 2010-10-26 | 2011-03-16 | 大连工业大学 | Teaching experiment system and experimental method suitable for communication type specialties |
| CN102186050A (en) * | 2011-04-26 | 2011-09-14 | 苏州阔地网络科技有限公司 | Webpage-based remote video conference method and system |
| CN102497291A (en) * | 2011-11-30 | 2012-06-13 | 江苏奇异点网络有限公司 | Time counting method for streaming media distance education |
| CN103794098A (en) * | 2014-01-01 | 2014-05-14 | 广州东软科技有限公司 | Intelligent teaching management system |
| CN104020752A (en) * | 2014-06-24 | 2014-09-03 | 南京化工职业技术学院 | Polystyrene teaching factory for teaching and training and chemical equipment thereof |
| CN105225557A (en) * | 2014-09-02 | 2016-01-06 | 山东轻工职业学院 | A kind of mobile interactive teaching platform |
| CN104484760A (en) * | 2014-12-17 | 2015-04-01 | 天脉聚源（北京）教育科技有限公司 | Teaching course configuration method and device for intelligent teaching system |
| CN104504948A (en) * | 2014-12-17 | 2015-04-08 | 天脉聚源（北京）教育科技有限公司 | Method and device for displaying pushed course for intelligent teaching system |
| CN104485030A (en) * | 2014-12-17 | 2015-04-01 | 天脉聚源（北京）教育科技有限公司 | Method for displaying courseware on intelligent teaching system learning terminal |
| CN104994081A (en) * | 2015-02-10 | 2015-10-21 | 阔地教育科技有限公司 | Data flow control system, data flow control equipment and terminal |
| CN105516137A (en) * | 2015-12-08 | 2016-04-20 | 英业达科技有限公司 | Certification system of learning platform and method thereof |
| CN105975520A (en) * | 2016-04-29 | 2016-09-28 | 东北大学 | System and method for customizing flexibly configured individualized learning scheme |
| CN105975520B (en) * | 2016-04-29 | 2019-07-23 | 东北大学 | A kind of the individualized learning scheme custom-built system and its method for customizing of flexible configuration |
| CN106683525A (en) * | 2016-11-16 | 2017-05-17 | 凌涛 | Practical teaching support platform in real scene |
| CN111009163A (en) * | 2019-12-17 | 2020-04-14 | 上海墨说科教设备有限公司 | Bidirectional interactive teaching method and system |
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