Wav文件作为频率图像 [英] Wav File As Frequency Image

问题描述

我想将wav文件显示为图像，因此频率显示在屏幕上，就像在wav编辑器中看到的一样.有什么想法吗?

I want to show a wav file as an image, so the frequency is charted on screen like you would see in a wav editor. Any ideas?

推荐答案

这是一个粗略的答案，您必须使用这些关键字进行更多的研究...首先，您需要一个 FFT函数 ( http://en.wikipedia.org/wiki/FFT )，我建议你尝试找到一个lib或源代码，无需重新发明轮子.然后，将该FFT功能应用于移动窗口.所以:

This is a rough answer, you have to investigate a little more with these keywords...First you need an FFT-function ( http://en.wikipedia.org/wiki/FFT ), I'd suggest you try to find a lib or source-code, no need to reinvent the wheel. Then you apply that FFT-function to a moving window. So:

1. 从wav文件中获取n个样本
2. 使用FFT函数对其进行转换
3. 将fft值转换为绝对值(即频谱)
4. 移动m个样本
5. 回到1.

1. take n-samples from your wav-file
2. converts them using the FFT-function,
3. convert the fft-values to absolute values (that's the spectrum)
4. moves on m-samples
5. go back to 1.

最后，每个窗口代表一个x值(时间)，光谱值代表y值(频率).这样，您就可以拥有自己的形象.

In the end each window stands for a x-value (time), and the values of the spectrum represent the y-value (frequencies). That way you have your image.

我希望这是中途可以理解的.很难用几句话来解释.祝你好运. :-)

I hope this is half-way understandable. It's hard to explain with just a few words. Good luck. :-)

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