NAudio 低通滤波器

Posted 2023-02-25

【中文标题】NAudio 低通滤波器

【英文标题】：NAudio Low Pass Filter

【发布时间】：2017-03-08 22:59:41

【问题描述】：

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，以减少来自麦克风的噪音。

一些背景：我打算用这段代码来创建一个VOIP程序。客户端将过滤后的 e.Buffer 数组发送给另一个客户端，然后播放音频。

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);
    

【参考方案1】：

查看 NAudio WPF 演示中的 Equalizer 类，了解如何使用 BiQuadFilter 类应用过滤器。