Design And Implementation Of PC-To-Phone Voice Terminal Software

This paper, combined with related scientific research, mainly develops the implementation of PC-To-Phone voice terminal software based on H.323 protocol. It includes some core technologies as signalling, network transmission controlling, voice real-time collecting and playing, voice encoding .decoding and disposing.In the part of basic theory , this paper particularly analyzes the socket programming based on TCP/UDP on windows platform, multi-thread technology ,H.323 protocol stack, the information of internet phone gateway and etc. In the part of conceptual project about terminal software, this paper mainly discusses the component of the software, modules partition and the development of main flow. And in the implementation of signalling module, this paper uses status machine and status table , which ensures the reliability of this software. In the development of network transmission module, it uses multi-thread technology and standard socket interface. In the part of voice encoding .decoding and disposing module , it takes use of prestore technology to solve the problem of voice twitter .Finally it analyzes the principle of voice real-time collecting and playing, and brings forward the double buffer alternation sampling technology to sample audio signal.