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例4：在sinc(t)信号中叠加噪声，分析对应频谱 fs=100 采样频率,必须大于两倍基带信号最高频率 ts=1/fs 采样时间间隔 T=2 时间窗大小 ( x=x+0.1*randn(1,N) x=awgn(x,-10, measured ) figure plot(t,x) title( 时域信号图 ) xlabel( t /s ) y=fft(x,N) figure if mod(N,2)~=0 N=N-1 end f=linspace(0,fs/2,N/2) plot(f,abs(y(1:N/2))*2/N) title( 叠加噪声的sinc(t)信号频谱 ) xlabel( f /Hz ) figure y0=y(1:N/2) P=y0.*conj(y0)/N P=10*log10(P) plot(f,P) title( 功率谱 ) xlabel( f /Hz ) )

Matlab教程第六章案例，时间序列分析与计量(Matlab Guide Chapter cases, time series analysis and measurement)

说明：  救护车的报警程序，分别为1000Hz和800Hz.(Ambulance alarm procedures were 1000Hz and 800Hz.)

VC调用matlab的典型编程，采用matlab引擎的方法，成功实现了Vc对matlab的调用。并且做了可视化的界面。把程序中的main_edgelink2换成自己要调用的matlab程序(VC typical call Matlab programming using Matlab engine, the successful implementation of the Vc Matlab call. Done a visual interface. The procedures main_edgelink2 replaced by themselves to the calling procedure Matlab)

VC调用matlab画图，需要安装matlab(VC call matlab to draw fig)

在matlab中实现哈夫曼压缩和解压缩。(Huffman compression and decompression in matlab.)

关于支持向量机的MATLABB程序，用于模式识别可直接使用。 (MATLABB program on support vector machine for pattern recognition can be used directly.)

本文提出了一种基于独立分量分析的音频数字水印方法。嵌入水印时,对原始音频文件进行一级小波分解,在分解 得到的逼近分量中利用随机混合方法嵌入水印后进行小波逆变换形成嵌入水印的音频文件。仿真实验结果表明这种方 法的强鲁棒性和可行性。(Abstract:Audio p roduction is one of the important digital multimedias, which transmit becomes more and more convenient. To p revent the multimedia content from being stolen or illegally used, audio content p rotection techniques become increasingly impor2 tant so that the potential of these app lications can be reached. As the importantmethod of copyright p rotection, the digitalwater2 marking technology has been acquired widely recognition and research. This paper p resents a method of digital audio watermark2 ing based on independent component analysis. When embedding watermarking, the original audio is decomposed by single2level discrete 12D wavelet transform, watermarking is embedded by mixing randomly to the app roximation coefficient vector obtained, and the audio is single2level reconstructed receiving audio havingwatermarking. Emulated experiment results show that thismeth2 od is robust and feasible.)

说明：  关于8psk的用星座图检验结果的matlab仿真程序(Constellation on the 8psk of test results with matlab simulation program)

能使桌面上不停的换色.请先生成EXE再运行不然会出错。(Enable non-stop for the desktop color. Please re-run the EXE generated will not go wrong.)