在VC平台上利用Directsound实现的3D音效效果，通过Directsound对声音的模拟效果，编程制作出超炫的3D音效特技-In VC platform using Directsound realize 3 d sound effect, through the Directsound voice to the simulation effect, programming make favorable balance of trade of dazzle 3 d sound stunt

1）编程思路：首先，本练习因为要制作模拟钢琴的实例，所以首先要生成程序界面：先通过语句Image m_ImgUp生成键盘、鼠标松开时显示的键盘图片，再通过语句Image m_ImgDown生成键盘、鼠标按下时显示的键盘图片，最后通过语句m_ImgUp=getImage(getDocumentBase(),"img/up.gif")和语句m_ImgDown=getImage（getDocumentBase（）,"img/down.gif"）加载图片，生成钢琴界面。然后，因为要实现模拟钢琴效果，所以

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 surroun