音頻，FFT不工作

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]); 
     } 
    } 

} 

}

我同時使用來自AForge的FFT有這個問題。這是使用它的正確方法嗎？返回的複數（此時僅返回前500個）每次都有第二個數字爲0。

Answer 1

您打印出錯誤的數據：

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