On the basis of PCM Encoding Theorem, a method for low rate equipments' imported into high rate digital transmission systems is given.
给出一种基于脉冲编码调制原理实现高速数字传输系统中低速设备接入的方法。
However, the digital speech needs much higher code rate than analogue signals resulting in high pressure on data transmission.
语音数字化以后，码率大幅度上升，给系统的数据传输造成了很大的压力，因此进行语音压缩编码是非常必要的。
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