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Audacity quick tip: quickly remove background noise
======
![](https://fedoramagazine.org/wp-content/uploads/2018/03/audacity-noise-816x345.png)
When recording sounds on a laptop — say for a simple first screencast — many users typically use the built-in microphone. However, these small microphones also capture a lot of background noise. In this quick tip, learn how to use [Audacity][1] in Fedora to quickly remove the background noise from audio files.
### Installing Audacity
Audacity is an application in Fedora for mixing, cutting, and editing audio files. It supports a wide range of formats out of the box on Fedora — including MP3 and OGG. Install Audacity from the Software application.
![][2]
If the terminal is more your speed, use the command:
```
sudo dnf install audacity
```
### Import your Audio, sample background noise
After installing Audacity, open the application, and import your sound using the **File > Import** menu item. This example uses a [sound bite from freesound.org][3] to which noise was added:
Next, take a sample of the background noise to be filtered out. With the tracks imported, select an area of the track that contains only the background noise. Then choose **Effect > Noise Reduction** from the menu, and press the **Get Noise Profile** button.
![][4]
### Filter the Noise
Next, select the area of the track you want to filter the noise from. Do this either by selecting with the mouse, or **Ctrl + a** to select the entire track. Finally, open the **Effect > Noise Reduction** dialog again, and click OK to apply the filter.
![][5]
Additionally, play around with the settings until your tracks sound better. Here is the original file again, followed by the noise reduced track for comparison (using the default settings):
https://ryanlerch.fedorapeople.org/sidebyside.ogg?_=2
--------------------------------------------------------------------------------
via: https://fedoramagazine.org/audacity-quick-tip-quickly-remove-background-noise/
作者：[Ryan Lerch][a]
选题：[lujun9972](https://github.com/lujun9972)
译者：[译者ID](https://github.com/译者ID)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]: https://fedoramagazine.org/introducing-flatpak/
[1]:https://www.audacityteam.org/
[2]:https://fedoramagazine.org/wp-content/uploads/2018/03/audacity-software.jpg
[3]:https://freesound.org/people/levinj/sounds/8323/
[4]:https://fedoramagazine.org/wp-content/uploads/2018/03/select-noise-profile.gif
[5]:https://fedoramagazine.org/wp-content/uploads/2018/03/apply-filter.gif

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Audacity 快速指南：快速消除背景噪音
======
![](https://fedoramagazine.org/wp-content/uploads/2018/03/audacity-noise-816x345.png)
当在笔记本电脑上录制声音时 - 比如首次简单地录屏 - 许多用户通常使用内置麦克风。但是，这些小型麦克风也会捕获很多背景噪音。在这个快速指南中，我们会学习如何使用 Fedora 中的 [Audacity][1] 快速移除音频文件中的背景噪音。
### 安装 Audacity
Audacity 是 Fedora 中用于混合、剪切和编辑音频文件的程序。在 Fedora 上它支持各种开箱即用的格式 - 包括 MP3 和 OGG。从软件中心安装 Audacity。
![][2]
如果你更喜欢终端，请使用以下命令：
```
sudo dnf install audacity
```
### 导入您的音频、样本背景噪音
安装 Audacity 后，打开程序，使用 **File > Import** 菜单项导入你的声音。这个例子使用了一个[来自 freesound.org 添加了噪音的声音][3]：
接下来，采样要滤除的背景噪音。导入音轨后，选择仅包含背景噪音的音轨区域。然后从菜单中选择 **Effect > Noise Reduction**，然后按下 **Get Noise Profile** 按钮。
![][4]
### 过滤噪音
接下来，选择你要过滤噪音的音轨区域。通过使用鼠标进行选择，或者按 **Ctrl + a** 来选择整个音轨。最后，再次打开 **Effect > Noise Reduction** 对话框，然后单击确定以应用滤镜。
![][5]
此外，调整设置，直到你的音轨听起来更好。这里是原始文件，接下来是用于比较的降噪音轨（使用默认设置）：
https://ryanlerch.fedorapeople.org/sidebyside.ogg?_=2
--------------------------------------------------------------------------------
via: https://fedoramagazine.org/audacity-quick-tip-quickly-remove-background-noise/
作者：[Ryan Lerch][a]
选题：[lujun9972](https://github.com/lujun9972)
译者：[geekpi](https://github.com/geekpi)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]: https://fedoramagazine.org/introducing-flatpak/
[1]:https://www.audacityteam.org/
[2]:https://fedoramagazine.org/wp-content/uploads/2018/03/audacity-software.jpg
[3]:https://freesound.org/people/levinj/sounds/8323/
[4]:https://fedoramagazine.org/wp-content/uploads/2018/03/select-noise-profile.gif
[5]:https://fedoramagazine.org/wp-content/uploads/2018/03/apply-filter.gif