usb接口控制器可以实时读取外界环境的当前温度，且当温度超过某一阈值或低于某一阈值时发出报警-usb interface controller can immediately read the current external environment temperature, and when the temperature exceeds a certain threshold value or below a certain threshold value warning issued

Signal dimension estimates, Comparison of soft threshold and hard threshold and today various threshold calculation method, Least-squares regression analysis algorithm.