半速率，是一条信道承载2个通话的方式。很明显，半速率会使通话质量明显下降.在运营商信道资源紧缺的情况下，通常使用半速率来缓解。
Compared with traditional full rate and half rate network,using AMR technology is able to improve network capability and quality greatly.
与传统的全速率和半速率网络相比,应用AMR技术能使网络容量和质量大幅提高。
参考来源 - AMR技术在GSM网络中的应用Half-rate speech coding technology (HR) is a fast way to improve network capacity.
半速率语音编码技术是一种能够快速提高网络容量的方法。
参考来源 - GSM蜂窝移动通信中的语音质量研究·2,447,543篇论文数据，部分数据来源于NoteExpress
双速率，半速率首选，第一次信道分配后速率的改变是允许的。
Dual rate, Half rate preferred, Change allowed after first channel allocation as a result of the request.
双速率，信道的首选项能过话音编码首选项来指示，第一次信道分配后全速率和半速率之间的改变是允许的。
Dual rate, channel preference indicated by the Speech coder preference, Changes between full rate and half rate allowed after first channel allocation as a result of the request.
双速率，信道的首选项能过话音编码首选项来指示，第一次信道分配后全速率和半速率之间的改变是允许的。
DRSC Dual rate, channel preference indicated by the Speech coder preference, Changes between full rate and half rate allowed after first channel allocation as a result of the request.
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