NAudio低通滤波器

Question

我编写了捕获麦克风音频的代码，然后通过扬声器播放音频。我想在e.Buffer byte []上实现一个低通滤波器来减少麦克风的噪音。

一些背景：我打算用这个代码来创建一个VOIP程序。客户端将过滤后的e.Buffer数组发送到另一个客户端，然后再播放音频。

class Program 
{ 
    public static int inputdevicenumber; 
    public static WaveFormat waveformat = new WaveFormat(44100, 16, 1); 
    static BufferedWaveProvider bufferedWaveProvider = new BufferedWaveProvider(waveformat); 
    static WaveOutEvent waveOut = new WaveOutEvent(); 

    static void Main(string[] args) 
    { 
     WaveInEvent waveIn = new WaveInEvent(); 

     int waveInDevices = WaveIn.DeviceCount; 
     for (int waveInDevice = 0; waveInDevice < waveInDevices; waveInDevice++) 
     { 
      WaveInCapabilities deviceInfo = WaveIn.GetCapabilities(waveInDevice); 
      Console.WriteLine("Device {0}: {1}, {2} channels", waveInDevice, deviceInfo.ProductName, deviceInfo.Channels); 
     } 

     string Reply = Console.ReadLine(); 
     inputdevicenumber = Convert.ToInt32(Reply); 

     NAUDIO_Capture(); 
     NAudio_Play(); 

     Console.ReadKey(); 

    } 

    static void NAUDIO_Capture() 
    { 
     WaveInEvent waveIn = new WaveInEvent(); 

     waveIn.BufferMilliseconds = 20; 
     waveIn.DeviceNumber = inputdevicenumber; 
     waveIn.WaveFormat = waveformat; 
     waveIn.DataAvailable += new EventHandler<WaveInEventArgs>(waveIn_DataAvailable); 
     waveIn.StartRecording(); 
    } 

    static void NAudio_Play() 
    { 
     bufferedWaveProvider.DiscardOnBufferOverflow = true; 
     waveOut.Init(bufferedWaveProvider); 
     waveOut.Play(); 
    } 

    static void waveIn_DataAvailable(object sender, WaveInEventArgs e) 
    { 
     bufferedWaveProvider.AddSamples(e.Buffer, 0, e.BytesRecorded); 
    } 
} 

Answer 1

看看在n音讯WPF演示的Equalizer类就看你怎么可以使用BiQuadFilter类应用过滤器。