在使用CCS的Simulator 进行滤波器特性测试时，需要输入时间信号 x[n]。下面给出一个产生输入信号的 C 语言程序，这个信号是频率为 3Hz、40Hz 和 80Hz的混和正弦波信号，文件名为firinput.c-Simulator for the use of CCS test the filter characteristics need to enter the time signal x [n]. The following is an input signal generated C-language program, this signal is a frequency of 3Hz, 40Hz and 80Hz sine wave of mixed signals, the file name firinput.c