基于EVRC解码算法的语音业务还原设计与实现

The design and implement of voice service restoration based on algorithms of EVRC decode

介绍了一种应用于码分多址(CDMA)移动通讯系统中的增强型变速率语音编解码器(EVRC),阐述该声码器的解码实现原理并对解码过程进行C代码仿真。在此基础上提出了一个语音数据实时解码播放的设计方案,实现对获取的EVRC编码的语音数据流进行解码处理,通过设置数据缓冲池完成对语音数据的缓存,完成解码输出PCM语音数据到WAV文件的编码转换,从而实现输出语音的实时播放和存储。测试效果表明该方案能够较好的实现对合成语音的实时播放。

This paper introduces the Enhanced Variable Rate Codec （EVRC）,which is widely used in Code Division Multiple Access （CDMA） communication system, describes the principal concepts of speech decoding and implement of the floating point C-simulation, then, puts forward a design of voice service real-time restoration to perform voice data for EVRC encoding. In order to store voice data, it also set up buffer pool, thereby it can achieve real-time playback and storage. Finally, the performance testing and analysis results show the design can achieve real-time broadcast for synthesis speech.