基于Speex的嵌入式无线数字音频交互系统

为改善IP电话的话音服务质量问题, 设计一种集无线数字语音的实时交互和语音记录功能于一体的具有良好音质的嵌入式语音终端。选取ARM Linux嵌入式系统作为语音通信的平台, 利用流媒体协议进行WiFi网络环境下数字语音的实时传输, 采用Speex语音引擎实现数字音频的编解码, 并利用Speex的预处理功能和回声消除功能提高话音的质量。测试结果表明, 当通信距离小于20 m时, 该语音交互系统具有良好的实时性, 话音流畅, 并且具有高质量的音质, 消除了通话中的回音并使噪声得到很好抑制。

Embedded Wireless Digital Audio Interactive System Based on Speex

In order to meet the demands for improving IP phone services problems, we proposed a design for embedded wireless audio real-time interactive and recording terminal with good communication quality. ARM Linux embedded system is used as the communication platform. Streaming media protocol is used to implement the digital audio real-time communication under WiFi network surroundings. Speex codec is used to implement the audio coding and decoding. And in order to improve the communication quality, the preprocessor and echo cancelation functions of Speex are utilized. The communication distance is less than 20 m, the system have good real-time feature, and the speech is fluent with good audio quality. The most outstanding advantage is that the echo is canceled and the noise is deeply depressed in communications.