虚拟声卡频率计 该程序是在VC++6.0环境中，用C++语言编写的，分三个模块：一个是程序框架模块，实现程序的框架结构；二是声卡采样模块，实现声卡对外部模拟信号的采样；三是对采得的信号进行频率值计算。-The program is in VC++6.0 environment, using C++ language and is divided into three modules: Module One is the procedural framework, the framework o