The Research And Implementation Of Online Spoken Training System

Under the support of two major technniques of the network and multimedia, remote tutoring system develops vigorously. As one new way of knowledge propagate, it is paid more and more attention .The online spoken language training system is an important component of the remote tutoring system , at the same time it is difficult to realize in the remote tutoring system. The main performance of this thesis is to realize global frame of online spoken language training system, study and solve the problem of playing stop, discontinous playing and the problem of out of step to play in what network appear in transmitting especially.With the existing online spoken training system deeply analyzed, according to the problem of playing stop, discontinous playing and the problem of out of step to play in what network appear in system, the implementation of online spoken training system base on RTP (real-time transport protocol) is put forward. Namely in the course of transmission of multimedia, at first ,the multimedia data is compressed in real time by MPEG-1 standard; then, the multimedia data is scheduled and repaired in real time ; finally, on UDP layer ,the new-type real time network and transport protocol-RTP/RTCP is adopted to control the transmission of multimedia data. With deeply analyzing algorithm of schedualing patch flow ,the alternative scheduling algorithm that is suitable to the system is put forward to schedual the multimedia data; On the basis of deeply analyzing algorithm of forward error correction (FEC),the repairing algorithm that is suitable for MPEG-1 video and audio is proposed. By means of above process the techniques which include the multi-media synchronism, the recovery of error in network transimission ,the transimission of multi-media in narrow band width are soloved. About realization of the whole system ,in this thesis, the concrete realization scheme which is on the basis of the method of the RTP implementation ,is put forward and applying object- Oriented method,the system is analyzed and designed in detail, then forms the whole application system further.On the basis of implementation of whole system,by testing each function of this system,it is show that :this system not only greatly responds to the request of the different fields of system, but also improve in more extent than the past system on the quality of playing multimedia.