包括单边带、双边带、载波抑制及四倍频,利用最小二乘法进行拟合多元非线性方程，实现用SDRAM运行nios，同时用SRAM保存摄像头数据。- Including single sideband, double sideband, suppressed carrier and quadruple, Multivariate least squares fitting method of nonlinear equations, Implemented with SDRAM run nios, whi