如何在给定频率下获得音频输入信号强度？ [英] How to get audio input signal intensity at given frequency?

问题描述

我正在寻找一些方法如何从音频输入每秒获得给定频率的信号强度。我找到了waveIn函数，但我不知道如何获取这些参数。



谢谢

Hi,
I'm looking for some way how to get signal intensity at given frequency from audio input every second. I found waveIn functions but I have no idea how to get these parameters.

Thank you

推荐答案

您需要的是频谱分析。数学背景称为傅里叶变换，它不能直接在有限的机器上实现，但有许多受限制的实现，如DFT和FFT。我想FFT是您正在寻找的关键字。请参阅以下说明： http://www.altdevblogaday.com/2011/05/17 / Understanding-the-fourier-transform / [ ^ ]



您可以使用 NAudio [ ^ ]如果您要使用c＃作为示例。



对于MFC，请查看以下内容：

使用DX11进行快速傅里叶变换 [ ^ ]

http://blogs.msdn.com/b/nativeconcurrency/archive/2011/11/15/fast-fourier-transforms- fft-on-the-gpu.aspx？Redirected = true [ ^ ]



但是首先，这一个： waveIn音频信号的FFT [ ^ ]

What you need is called spectrum analysis. The mathematical background is called Fourier transformation, which can't be implemented directly on a finite machine, but has many restricted implementations, like DFT and FFT. I suppose FFT is the keyword you are looking for. See this explanation: http://www.altdevblogaday.com/2011/05/17/understanding-the-fourier-transform/[^]

You could use NAudio[^] if you would use c# for example.

For MFC check these:
Fast Fourier transform using DX11[^]
http://blogs.msdn.com/b/nativeconcurrency/archive/2011/11/15/fast-fourier-transforms-fft-on-the-gpu.aspx?Redirected=true[^]

But first of all, this one: FFT of waveIn audio signals[^]

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