基于MATLAB和usb外置声卡的信号回检，检测信号频率，幅值，功率等。-Based on MATLAB and usb external sound card signal back to check, test signal frequency, amplitude, power, etc..

USB摄像头人脸检测与识别，实时分析，实时获取人脸部信息，python语言开发。(Face detection and recognition of USB camera and real-time analysis.)