使用dev-c++（gcc）开发环境，2048点定点FFT程序，使用查找表得到旋转因子-The use of dev-c++ (gcc) development environment, fixed-point 2048-point FFT, the use of look-up table has been rotating factor

31階低通濾波器有限脈衝響應濾波器（Finite Impulse Response Filter，FIR Filter），此濾波器主要功能為濾除不必要的高頻訊號，其濾波器係數為固定之係數。係數在程式碼的parameter宣告中。-31-order low-pass filter finite impulse response filter (Finite Impulse Response Filter, FIR Filter), the main function of this filter