Question

求高手解答4个LATEX公式怎么打 公式如图

Answer 1

1、\[\sigma^2=\frac{1}{N}\sum_{n=1}^{N}(x_n-y_n)^2\]

2、\[SNR=10\log_{10}\frac{\sigma_x^2}{\sigma_y^2}\]

3、\[D_{gran}=2\sum\nolimits_{i=1}^{\frac{N}{2}}\int_{(i-1)\Delta}^{i\Delta}(x-\frac{2i-1}{2}\Delta)^2\frac{1}{2X_{max}}{\rm d}x\]

4、\[\left\{\psi_{j,n}(t)=\frac{1}{\sqrt{2j}}\psi\left(\frac{t-2^j n}{2^j}\right)\right\}_{(j,n)\in Z^2}\]