本文介绍一种新的语言信号压扩增量调制编译码器,即环外压扩.它能够满足接入实际电信网路所要求的性能.在叙述了各种自适应增量调制之后,对环外压扩增量调制作详细的论述.叙述计算机模拟并分析了主要参数的影响.给出了对不同频率下用计算机模拟和实测的信噪比数据.术语索引:增量调制,音节压扩,传输误码,取样频率,综合通信网. This paper presents a new speech signal augmentation delta modulation codec, that is, out-of-band compression.It can meet the performance required to access the actual telecommunications network.After describing a variety of adaptive delta-modulation, Loop companding amplification modulation is described in detail.The computer simulation is described and the influence of the main parameters is analyzed.The signal to noise ratio data obtained by computer simulation and measurement under different frequencies are given.The term index: incremental modulation, syllable pressure Expansion, transmission error, sampling frequency, integrated communications network.