C# 如何从Accord.NET中的信号对象创建ComplexSignal对象？

我正在尝试对由.wav文件生成的信号执行FFT，该文件具有1个通道和64064个样本（16k时约4秒长）。我正在使用Accord.NET和以下代码尝试创建一个ComplexSignal对象，这是执行FFT所必需的

string fileName = "mu1.wav"; //the name of my wave file
WaveDecoder sourceDecoder = new WaveDecoder(fileName); //Accord.Audio.Formats.WaveDecoder
Signal s = sourceDecoder.Decode(); //SampleFormat says Format32bitIeeeFloat
ComplexSignal = s.ToComplex(); //This throws the following exception:

//InvalidSignalPropertiesException 
//Signals length should be a power of 2. 

读取Signal的源代码时，仅当Signal.SampleFormat不是Format32Bitieefloat时才应抛出此命令，事实上是这样的

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我真的很惊讶，在C#中操纵wav文件的音频功能（特别是频率）并不容易。

您需要创建一个大小为2次方的Hamming（或其他方法）窗口（我在这里选择了1024）。然后，在执行前向傅里叶变换之前，将窗口应用于复信号

        string fileName = "mu1.wav";
        WaveDecoder sourceDecoder = new WaveDecoder(fileName);
        Signal sourceSignal = sourceDecoder.Decode();

        //Create Hamming window so that signal will fit into power of 2:           
        RaisedCosineWindow window = RaisedCosineWindow.Hamming(1024);

        // Splits the source signal by walking each 512 samples, then creating 
        // a 1024 sample window. Note that this will result in overlapped windows.
        Signal[] windows = sourceSignal.Split(window, 512);

        // You might need to import Accord.Math in order to call this:
        ComplexSignal[] complex = windows.Apply(ComplexSignal.FromSignal);

        // Forward to the Fourier domain
        complex.ForwardFourierTransform(); //Complete!

        //Recommend building a histogram to see the results

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您需要创建一个大小为2次方的Hamming（或其他方法）窗口（我在这里选择了1024）。然后，在执行前向傅里叶变换之前，将窗口应用于复信号

        string fileName = "mu1.wav";
        WaveDecoder sourceDecoder = new WaveDecoder(fileName);
        Signal sourceSignal = sourceDecoder.Decode();

        //Create Hamming window so that signal will fit into power of 2:           
        RaisedCosineWindow window = RaisedCosineWindow.Hamming(1024);

        // Splits the source signal by walking each 512 samples, then creating 
        // a 1024 sample window. Note that this will result in overlapped windows.
        Signal[] windows = sourceSignal.Split(window, 512);

        // You might need to import Accord.Math in order to call this:
        ComplexSignal[] complex = windows.Apply(ComplexSignal.FromSignal);

        // Forward to the Fourier domain
        complex.ForwardFourierTransform(); //Complete!

        //Recommend building a histogram to see the results

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这些结果与udpated Accord.NET库有关，可在此处找到：从昨天起，它现在也可以与最新版本（2.12）一起使用-感谢您报告此问题！这将为我返回所有

NaN

（@Meekohi检查您的源数据，确保您的汉明窗口为2的幂。这可能是Cesar的问题（参见上面的回答，其中说明这应该在他的2.12版中得到修复。也许它作为一个bug重新引入？）这些结果与udpated Accord.NET库有关，可在此处找到：从昨天起，它现在也可以与最新版本（2.12）一起使用-感谢您报告此问题！这将为我返回所有

NaN

：（@Meekohi检查您的源数据，确保您的汉明窗口为2的幂。这可能是Cesar的问题（参见上面他的回答，其中指出这应该在他的2.12版中修复。也许它作为一个bug被重新引入？）