c# - 音频，FFT不起作用

Question

class Main
{

    WaveFileReader reader;
    short[] sample;
    Complex[] tmpComplexArray;

    public Main()
    {

        //read in wav, to raw data in byte array then to short array.
        reader = new WaveFileReader("C:\\Users\\minford\\Downloads\\English_Subtitles_.wav");

        byte[] buffer = new byte[reader.Length];
        reader.Read(buffer, 0 , buffer.Length);
        sample = new short[reader.Length];
        for (int n = 0; n < buffer.Length; n += 2)
        {
            sample[n] = BitConverter.ToInt16(buffer, n);

        }




        // short array to complex
       Complex[] complexData = new Complex[sample.Length];
        for (int i = 0; i < complexData.Length; i++)
        {
            Complex tmp = new Complex(sample[i],0);

            complexData[i] = tmp;


        }

        //to get first 500 for testing.
        tmpComplexArray = new Complex[500];
        for (int i = 0; i < 500; i++)
        {
           Complex a = new Complex(complexData[i]);
           tmpComplexArray[i] = a;
        }
        //run FFT
        FourierTransform.DFT(tmpComplexArray ,FourierTransform.Direction.Forward);

        //print result
        for (int i = 0; i < complexData.Length; i++)
        {
            Console.Write(complexData[i]);
        }
    }

}

}

使用AForge的FFT时遇到此问题。这是正确的使用方式吗？返回的复数(此时仅返回前500个)每次都将第二个数字设为0。

Answer 1

您正在打印错误的数据:

    //print result      vvvvvvvvvvvvvvv
    for (int i = 0; i < tmpComplexArray.Length; i++)
    {
        Console.Write(tmpComplexArray[i]);
    }