Abstract:

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.

Key words: embedded system, streaming media system, Speex audio engine, echo cancelation