Advances a modification method to CORDIC gain.(4) Researches the digital adaptive filters in system, concluded the common construction of variable adaptive arithmetic.

• 对于CORDIC旋转带来的增益问题，提出了自己的改进方法。(4)对自适应数字滤波器进行了较为系统的研究，归纳了各类自适应算法在具体实现过程中的共同点。