如何从.wav声音转换为double [] C# [英] How to get from .wav sound into double[] C#

问题描述

我需要执行FFT，并且我有一个声音样本.wav格式. 函数需要double[] xRe, double[] xIm, REAL PART and imaginary part如何将声音文件转换为double []? 我从未见过这样的事情.在互联网上找不到这种操作. 这是声音示例: http://www.speedyshare.com/fFD8t/e.wav

I need to perform FFT and I have a sound sample .wav format. The function needs double[] xRe, double[] xIm, REAL PART and imaginary part How to convert the sound file into double[]? I have never seen something like that. Could not find in the internet that kind of operation. This is this sound sample: http://www.speedyshare.com/fFD8t/e.wav

请帮助，因为我使用过Pascal，但现在不知道该怎么办.

Please help, cause I used Pascal and now don't know what to do here.

推荐答案

这是一个简单的流操作.

It's a simple stream operation.

1. 您必须阅读wav文件头.
2. 您必须读取数据字节.

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

这是更详细的说明:

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

在这里您可以阅读有关WAV文件格式的信息:

And here you can read about WAV file format:

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

关于WAV的复数和FFT:

And something about WAV as complex numbers and FFT:

如何将波浪数据转换为复数

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