Real-time speech coding and decoding for GSM system and its implement in VC
Guojin Wan, Qingyi Xu, Jing Zhong Xiao, Sheng Lu · 2011
Speech signal is the most important part of the GSM mobile communication, thus the speech coding technology and high efficiency digital modulation technology can provide a higher system capacity for digital mobile networks than analog mobile network. Most of the implementation of speech code-decode is mainly in DSP platform, but this paper presents three low- rate speech coding schemes provided in the 3GPP protocol and the way to implement them in VC platform. We describe a compressed method to greatly reduce the size of the coded audio files. In addition, we can play decoded audio files in VC++ in real-time. It is impossible to play audio files in the DSP platform. So our method in VC platform is better than the method in DSP platform.