The Research Of The Application Of Speech-Processing Technology In The VTS System

With the development of information age, many technologies based on computer have been widely used in Vessel Traffic Services(VTS) System. As an important component, VHF(Very High Frequency Radiotelephony) subsystem utilizes the speech communication to ensure the VTS system has its basic function. But old speech-processing method used in the VHP subsystem can't meet with the development of the VTS system in many aspects, including the storage, query, interface and the integration in the whole VTS information-processing system.To fulfill this requirement, this thesis does some research in the application of speech-processing technology in VTS system. A practicable speech-processing scheme has been brought out. Also, a practicable speech-management system has been realized. With the integration of the VTS system and the speech-management system, the function of the VTS system can be improved highly.In the thesis, the speech coding method defined in the recommendation G.729A, that is Conjugate-Structure Algebraic-Code-Excited Linear-Predictive (CS-ACELP) coding method, is discussed. Based on this method, a multi-channel speech-processing system has been developed.The key technology used in the realization of the speech-processing system is discussed in the thesis. In the end, the performance of the system has been brought forth .The system has many functions, including the speech recordation, real time compression and decompression of speech, rapid location of specific speech. It is realized by software, so the system is easily installed, maintained and extended..The thesis resolved some problem in speech-processing method in VTS system. And the speech-management system realized in the thesis can be used in some other fields besides VTS system. So it has some practical value.