关键词: 多路语音混合, 模拟语音通讯系统, 同步机制, 缓冲队列, 衰减因子

Abstract: Based on the tower control communication simulation system, the function of multi-voice mixing is designed and implemented. The sending parts use the mechanism of double threads and multi-buffer to guarantee real-time data transmission; the introduction of more than one buffer queues in synchronization mechanism creates good conditions for the implementation of synchronization for mixing; some improvements are proposed for the key mixing algorithms, and mixing efficiency is significantly improved. The system uses Speex voice compression library which is specially designed for sound decompression. Its high decompression efficiency of voice signal has been well reflected in the application. Simulation results show that the set of multi-voice mixing is feasible, and has a certain validity and superiority.

Key words: multi-voice mixing, simular voice communication system, synchronization mechanism, buffer queue;attenuation factor