在 Java 中使用傅立叶变换处理音频数据
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Processing Audio Data using Fourier Transforms in Java
提问by dedalo
I'm trying to process audio data. I'm working with Java. I've extracted the audio data to an array. Now I should pass N data samples to a function that calculates the Discrete Fourier Transform (or Fast Fourier Transform, which is more efficient). I've read documentation but I'm getting more and more confused. What I'm trying to calculate is the magnitude spectrum (|X(k)|). Can anyone help me? Thanks
我正在尝试处理音频数据。我正在使用 Java。我已经将音频数据提取到一个数组中。现在我应该将 N 个数据样本传递给一个计算离散傅立叶变换（或更有效的快速傅立叶变换）的函数。我已经阅读了文档，但我越来越困惑。我要计算的是幅度谱 (|X(k)|)。谁能帮我？谢谢
回答by Robert Harvey
Richard G. Baldwin has a number of very good articles on Fast Fourier Transform algorithms in Java on the Developer.com website. In particular, the following articles should prove to be useful:
Richard G. Baldwin 在 Developer.com 网站上有许多关于 Java 中的快速傅立叶变换算法的非常好的文章。特别是，以下文章应该被证明是有用的：
Fun with Java, Understanding the Fast Fourier Transform (FFT) Algorithmhttp://www.developer.com/java/other/article.php/3457251/Fun-with-Java-Understanding-the-Fast-Fourier-Transform-FFT-Algorithm.htm
Java 乐趣，理解快速傅立叶变换 (FFT) 算法http://www.developer.com/java/other/article.php/3457251/Fun-with-Java-Understanding-the-Fast-Fourier-Transform-FFT -算法.htm
Spectrum Analysis using Java, Sampling Frequency, Folding Frequency, and the FFT Algorithmhttp://www.developer.com/java/other/article.php/3380031/Spectrum-Analysis-using-Java-Sampling-Frequency-Folding-Frequency-and-the-FFT-Algorithm.htm
使用 Java、采样频率、折叠频率和 FFT 算法进行频谱分析http://www.developer.com/java/other/article.php/3380031/Spectrum-Analysis-using-Java-Sampling-Frequency-Folding-Frequency -and-the-FFT-Algorithm.htm
回答by Sher
If you only want Magnitude Spectrum of audio, go for jAudio API.
如果您只想要音频的 Magnitude Spectrum，请选择jAudio API。
It provides class for calculating MS.
它提供了计算 MS 的类。
回答by c'quet
The link from @Sher is broken now. There is an API for the same purpose http://code.google.com/p/musicg/
来自@Sher 的链接现在已损坏。有一个用于相同目的的 API http://code.google.com/p/musicg/
