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在低速率终端设备的语音信号传输中由于带宽的限制不可避免要进行编码调制 ,其中ITU推荐的自适应差分脉冲码调制 (ADPCM)是自适应技术 (自适应预测和自适应量化 )和差分脉冲码调制的结合。介绍了ADPCM的原理及编码方案 ,对适用于12 8kbit/s的均匀PCM信道数据和 16kbit/s的ADPCM数据的转换的编码方案进行了实验测试 ,给出了分析实验结果
It is unavoidable to perform coding modulation in the voice signal transmission of low-rate terminal equipment due to the limitation of bandwidth. Among them, ADPCM proposed by ITU is adaptive technology (adaptive prediction and adaptive quantization) and differential pulse The combination of code modulation. The principle and coding scheme of ADPCM are introduced. The coding scheme of the conversion of uniform PCM channel data and 16 kbit / s ADPCM data suitable for 12 8 kbit / s is tested. The experimental results