在一个256*256像素的图像中嵌入水印，并经过高斯白噪声，最后在解调出原始图像与水印图像-In a 256* 256 pixel image embedded watermark, and after a Gaussian white noise, and finally demodulate the original image and watermark image

FM without noise Fs = input( enter the value of Fs ) Sampling rate of signal Fc = input( enter the value of Fc ) Carrier frequency t = [0:Fs] /Fs Sampling times x = sin(2*pi*20*t) +2*sin(2*pi*60*t) Channel dev = input( enter the valu