iPhone录音时如何查找频率？
在我的应用程序中，我已经录制了语音并在设备中播放。 现在我想找到录制的声音的音频频率（录制时）。我怎样才能找到？我不知道。我已经下载了“aurio Touch”程序。但是它太难理解我了。那么有没有可用的教程（iPhone）？我怎样才能做到这一点？
请指导我。
谢谢。
In my application i have done to record the voice and playing in the device.
Now i want to find the audio frequency of that recorded voice(While recording). How can i find?.I dont have any idea. I have downloaded "aurio Touch" program.But its too difficult to understand me. So is there any tutorials are avilable(in iPhone)?. How can i achieve this?
Please guide me.
Thanks.
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这就涉及到数学了。如果这让您感到害怕，您可能应该获得/购买一个库来为您进行分析。如果没有，傅立叶变换是一个很好的起点，可以了解所涉及的内容。当我这样做时，我首先浏览 Audacity 的源代码以了解所涉及的内容。
This involves math. If that scares you, you should probably get/buy a library to do the analysis for you. If not, Fourier transform is a good place to start to see what's involved. When I did this, I started by poking around Audacity's source code to get an idea of what's involved.