多通道声音的周期图
对用于双音多频信号（DTMF）中的频率进行匹配.
对每个键创建一对高低频率.
| In[1]:= |  X |
| Out[1]= |  |
| Out[2]= |  |
通过全部12键音调组合，创建12通道的声音.
| In[3]:= |  X |
| Out[3]= |  |
| In[4]:= |  X |
可视化已创建声音的周期图.
| In[5]:= |  X |
| Out[5]= |  |
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