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阐述了新型数话兼容列车无线调度通信系统的关键技术——数话同传和话音压缩／扩展，比较分析了几种数字编码方式，着重论述了连续可变斜率增量调制（ＣＶＳＤ）编码方式的原理、性能、编解码过程及在本系统中的应用。
In this paper, the key technologies of the new digital speech-compatible train wireless dispatching communication system are described, which are digital simultaneous speech and voice compression / expansion. Several digital coding methods are compared and analyzed. The CVSD coding method Principle, performance, codec process and application in this system.