我的directx声音缓冲区有静电噪声。请帮忙。 [英] My directx sound buffer has static noise. Please help.

问题描述

所以我喜欢从事大学任务（保持我的一些技能），我决定解决这个问题：



COS 126编程作业：数字信号处理作业 [ ^ ]



我正在运行MSVS2015 C＃/ Console应用程序以及SharpDX软件包，这使我可以访问一些基础DirectSound功能。我只是想在第一个例子中创建并播放2秒音符'A'。当我运行以下代码时，它会播放2秒，但它非常静态。我假设我的计算中有一些东西，但我无法弄清楚到底是什么。有没有人有写自己的数字声音缓冲区的经验？



谢谢，

- 杰夫



我尝试过：

So I enjoy working on college assignments (to keep some of my skills sharp) and I've decided to tackle this one:

COS 126 Programming Assignment: Digital Signal Processing Assignment[^]

I'm running MSVS2015 C#/Console app along with the SharpDX package that gives me access to some underlying DirectSound capabilities. I'm just trying to create and play a 2 second note 'A' as they go over in the first example. When I run the following code it plays the 2 seconds but it is very static-y. I'm assuming there is something off with my calculations but I can't figure out what exactly. Does anyone have experience writing their own digital sound buffers?

Thanks,
- Jeff

What I have tried:

public class Execution : IDisposable
{
	IntPtr Handle;
	DirectSound Device;
	SecondarySoundBuffer Buffer;

	public Execution()
	{
		Handle = System.Diagnostics.Process.GetCurrentProcess().MainWindowHandle;

		Device = new DirectSound();
		Device.SetCooperativeLevel(Handle, CooperativeLevel.Priority);

		var rate = 44100;
		var bits = 16;
		var channels = 1;
		var waveFormat = new WaveFormat(rate, bits, channels);

		// Create a buffer with 2 seconds of sample data
		var seconds = 2;

		var bufferDescription = new SoundBufferDescription() { Format = waveFormat, BufferBytes = waveFormat.AverageBytesPerSecond * seconds };
		Buffer = new SecondarySoundBuffer(Device, bufferDescription);

		var noteFrequency = 440f;       // A
		var bufferData = new float[bufferDescription.BufferBytes];

		var count = 0;
		for (var sample = 0; sample < bufferDescription.BufferBytes; sample++)
		{
			var sampleInSeconds = (float)sample / (float)bufferDescription.BufferBytes * (float)seconds;
			var value = (float)Math.Sin(2f * Math.PI * noteFrequency * sampleInSeconds );
			bufferData[sample] = value;
		}

		Buffer.Write(bufferData, 0, LockFlags.EntireBuffer);
	}

	public void Execute()
	{
		Buffer.Play(0, 0);
	}

	public void Dispose()
	{
		Buffer.Dispose();
		Device.Dispose();
	}
}

推荐答案

好吧，我认为你是以不正确的格式编写数据。典型的16位波形文件使用整数而不是浮点数。



另外，显然 float 是32位因此它不能成为16位波形文件的正确数据。



鉴于广泛和类型的数据都不同于预期的数据，你会怎么做？期望得到好的结果？



一个好的起点是从分析包含这种波形的波形文件开始，并将数据与数据进行比较。找到生成wave的应用程序或代码应该不难。



另外，通过使用一个不错的声音编辑器，显然数据是正确的如果你将数据放大到足以看到波浪本身的点。

Well, I would think that you are writing the data in an incorrect format. A typical 16 bit wave file uses integers and not floating points.

Also, obviously a float is 32 bit so it cannot be the proper data for a 16 bit wave file.

Given that both the wide and the type of data are different than the expected one, how would you expect to get good result?

A good starting point would be to start by analysing a wave file that contain such wave form and compare the data with your data. It should not be hard to find either application or code to generated a wave.

Also, by using a decent sound editor, it should be obvious it the data is correct if you zoom enough on data to the point you see the wave itself.

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