用CORDIC算法来计算正弦和余弦函数，稍加修改还可计算其他函数-CORDIC algorithm is used to calculate the sine and cosine functions, other functions can be calculated slightly modified

升余弦滚降系统的源程序(用于调制解调系统中波形成型)-Ascending cosine roll-offs system source program (type used for medium wave modulation demodulation system form)