本文档设计的虚拟环绕立体声系统，将普通双声道音频信号经过数字信号处理器(DSP)处理，转变成具有环绕立体声效果的双声道音频信号。-This document is designed for virtual surround sound system, the ordinary two-channel audio signal through a digital signal processor (DSP) treated with a two-channel audio into surround sound effect signal.