这个接口卡程序负责采集低频音频信号，USB控制芯片采用AN2131QC。软件包括3个模块：Keil51编写芯片固件程序，vc++编写USB驱动程序和用户程序-the interface card collection procedures for low-frequency audio signals, control chips using USB Peripheral. The software includes three modules : the preparation Keil51

For USB program, low pass filter for audio,Audio low-frequency Pass filter.-For USB program, low pass filter for audio, Audio low-frequency Pass filter.

音响系统的USB接口开发分析及主流芯片比较。越来越多的音响系统采用USB接口标准，同时市场上出现了各种USB芯片方案，如何选择合适的芯片方案来设计系统具有一定挑战性，设计工程师需要了解USB音响系统的架构、USB主流芯片的功能特性、控制模块的设计。-USB audio system interface chips mainstream development analysis and comparison. An increasing number of audio systems using

* Descr iption: this test program will capture the video and audio stream * from a Logitech QuickCam© Pro 3000 USB camera for 10 seconds and stores * it on a file, named "testcam.avi". You can use the microsoft windows * media player to