设计一个窗口，包含一个或两个或四个轴系，若干输入框和按钮。按钮功能包括：

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：计算并显示功率谱密度

功率谱密度。可以设置滤波：滤波并显示滤波后的信号和滤波种类及滤波频率。-

Design a window that contains one or two or four shafts, several input boxes and buttons. Button functions include:

Generate a signal consisting of a number of sine waves of different frequencies and uniformly distributed noise and display. (Allows the user to set different frequencies, set the amplitude, and set the signal length.)

Save: Save the generated signal to a binary file.

Open: Open the binary file and display it.

Calculate and calculate the power spectral density

Power Spectral Density. You can set the filter: filter and display the filtered signal and filter type and filter frequency.