12、使用TCP的双人或多人聊天程序

13、生成：生成一个由若干个不同频率的正弦波以及均匀分布噪声组成的信号，并显示。（允许用户挑选正弦波个数、设置不同频率、设置幅值、设置信号长度。）

保存：将生成的信号保存到二进制文件中。

打开：打开二进制文件，并显示。

计算：计算并显示功率谱

滤波：可以设置滤波种类及滤波频率，可以选择是否滤波。

只使用两个Graph，分别用于显示信号和功率谱。（若进行滤波，则只显示滤波后信号和功率谱）-12, Double or multiplayer chat program using TCP 13 generation: to generate a signal noise consisting of several different frequency sine wave, and uniform distribution, and display. (Allowing the user to pick a sine wave number, set a different frequency, set the amplitude, set the length of the signal.) Save: Save the generated signal to a binary file. Open: Open a binary file, and display. Calculation: calculates and displays the power spectral filter: filter types and filter frequency can be set, you can choose whether to filter. Uses only two Graph, respectively, for a display signal and the power spectrum. (If the filtering only display the filtered signal and power spectrum)