无线列车调度实现数据话音同传

Wireless train order implementing speech and voice data simultaneous transmitting

为了保证行车安全,在无线列车调度系统中,利用话音压缩/扩展技术实现同一无线信道数据话音同时传输。在分析和比较了几种话音编码方式的基础上,确定本系统采用连续可变斜率增量调制方式(CVSD)编解码方式,该编解码方式具有较好的抗误码特性及量化信噪比。根据CVSD的编解码特性,提出了话音压缩/扩展技术在系统中的具体实现。采用TMS320C3X系列DSP芯片实现了该系统功能。

In order to ensure the safety of train traveling,speech and voice data simultaneous transmitting method is implementing on the same wireless information channel using compressing and expanding technologies on Wireless train order system.Based on analyzing and comparing of several voice coding methods,continuous slope-variable delta modulation(CVSD) coding/decoding method is adopted,CVSD has good characteristic of resisting error code and sampling signal noise ratio(SNR).According to the characteristic of CVSD coding/decoding,this system put forward a Specific implementing about voice technology compressing and expanding.The functions of this system was achieved with the TMS320c3x family DSP.