音频时间序列特性
ExampleData 包含有 1970 年 4 月 1 3日著名的阿波罗 13 号乘组向休斯敦任务控制中心报告氧气罐爆炸的录音.
In[1]:=
![Click for copyable input](assets.zh/audio-time-series-properties/In_73.png)
audio = ExampleData[{"Sound", "Apollo13Problem"}, "Audio"]
功率和音量显示出说话的声音出现的时间.
In[2]:=
![Click for copyable input](assets.zh/audio-time-series-properties/In_74.png)
{power, loudness} =
AudioLocalMeasurements[audio, {"Power", "Loudness"}, "List"]
Out[2]=
![](assets.zh/audio-time-series-properties/O_38.png)
In[3]:=
![Click for copyable input](assets.zh/audio-time-series-properties/In_75.png)
ListLinePlot[{power, loudness}, PlotRange -> All,
PlotLegends -> {"Power", "Loudness"}]
Out[3]=
![](assets.zh/audio-time-series-properties/O_39.png)
计算功率和音量时间序列的某些概括统计量.
In[4]:=
![Click for copyable input](assets.zh/audio-time-series-properties/In_76.png)
summary[ts_] := {Min[ts], Mean[ts], Median[ts], Max[ts]};
In[5]:=
![Click for copyable input](assets.zh/audio-time-series-properties/In_77.png)
TableForm[{summary[power], summary[loudness]},
TableHeadings -> {{"Power", "Loudness"}, {"Min", "Mean", "Median",
"Max"}}]
Out[5]//TableForm=
![](assets.zh/audio-time-series-properties/O_40.png)