如何从.wav声音变成double [] C#

Question

我需要执行FFT,我有一个声音样本.wav格式.该功能需要 double[] xRe, double[] xIm, REAL PART and imaginary part如何将声音文件转换为double []？我从来没有见过这样的东西.无法在互联网上找到那种操作.这是一个声音样本:http: //www.speedyshare.com/fFD8t/e.wav

请帮助,因为我使用Pascal,现在不知道该怎么做.

Answer 1

这是一个简单的流操作.

1. 你必须阅读wav文件头.
2. 你必须读取数据字节.

从MSDN粘贴:

BinaryReader reader = new BinaryReader(waveFileStream);

//Read the wave file header from the buffer. 

int chunkID = reader.ReadInt32();
int fileSize = reader.ReadInt32();
int riffType = reader.ReadInt32();
int fmtID = reader.ReadInt32();
int fmtSize = reader.ReadInt32();
int fmtCode = reader.ReadInt16();
int channels = reader.ReadInt16();
int sampleRate = reader.ReadInt32();
int fmtAvgBPS = reader.ReadInt32();
int fmtBlockAlign = reader.ReadInt16();
int bitDepth = reader.ReadInt16();

if (fmtSize == 18)
{
    // Read any extra values
    int fmtExtraSize = reader.ReadInt16();
    reader.ReadBytes(fmtExtraSize);
}

int dataID = reader.ReadInt32();
int dataSize = reader.ReadInt32();


// Store the audio data of the wave file to a byte array. 

byteArray = reader.ReadBytes(dataSize);

// After this you have to split that byte array for each channel (Left,Right)
// Wav supports many channels, so you have to read channel from header

这里有更详细的解释:

http://msdn.microsoft.com/en-us/library/ff827591.aspx

在这里你可以阅读有关WAV文件格式:

https://ccrma.stanford.edu/courses/422/projects/WaveFormat/

关于WAV的复杂数字和FFT:

如何将波形数据转换为复数