I am interested in the general information on the implementation of vocoders(voice coders/voice codecs)on both the terminal side and the base station side(including algorithms and standards). General introduction and information sources are requested. I am a developer in China and information concerning the terminals marketed in China such as those sold by Nokia, Siemens,Motorola, Ericson and TCL(Wavecom) are most welcome. Please email me at<llhhxy@yeah.net>.