amr是一种优秀的变速率语音编码技术，这篇文档介绍了amr中用到的两种帧结构。-amr is outstanding variable-rate speech coding technology, This document describes the amr which use the two frame structure.

amrwb适用于3G系统的变速率语音编码技术，这篇文档介绍了amrwb中的帧结构。-amrwb applicable to the 3G system variable-rate speech coding technology, This document describes the amrwb the frame structure.