在尝试进行简单的语音旁白时，我们可能会在背景中体验到持续不断的嘶嘶声或口哨声。不必要地受到问题的困扰，我们开始寻找解决此问题的方法并遇到多个教程。不幸的是，其中许多要么明显令人困惑，要么为优质产品推销。别担心，试试Audacity软件吧！^(Audacity)

Audacity是一款免费、开源、跨平台的Windows音频软件。易于使用的软件。我们之前已经介绍过这篇文章，我们在其中学习了使用 Audacity 拆分和合并音频文件的技术。今天，我们将学习通过Audacity减少录音中的背景噪音。

减少或消除背景噪音

降噪

Audacity具有“降噪”音频效果。它可以消除录音中的某些噪音。这种效果最适用于背景嘶嘶声等噪音。要降低噪音水平，您首先选择只是噪音的音频并创建“噪音配置文件”。一旦Audacity知道噪声配置文件，它就可以降低您选择的音频中那种噪声的响度。

首先，将语音文件添加到应用程序。Audacity可以导入许多常见的音频文件格式，包括WAV、AIFF和MP3。

接下来，查看立体声波形。左声道显示在轨道的上半部分，右声道显示在下半部分。观察波形接近轨道顶部和底部的位置，音频更响亮。注意^(Notice)立体声波形。它会告诉你哪些部分是安静的。使用鼠标单击并拖动安静的部分以将其选中。

此后，切换到效果^(Effects)菜单。Audacity包含许多内置效果，可让您使用各种插件效果。此外，所有具有对话框的效果都可以让您在将效果应用于波形之前听到由效果修改的音频。

访问后，转到“降噪^{(Noise Reduction)}”单击它以打开一个窗口^(Window)。寻找读取“噪声配置文件^{(Noise Profile)}”的选项，然后点击确定按钮。

在此之后，选择声音文件中带有画外音的部分。重复上述相同步骤，按顺序重复并根据需要修改降噪级别。

完成后，选择确定。

现在，您会发现文件的波形随着噪音水平的逐渐降低而发生了变化。播放声音片段以验证它。

由于光谱选择^{(Spectral Selection)}功能，所有这些都在Audacity中变得容易。^(Audacity)它是Spectrograms中的特色功能，可让您查看音频的频率内容，然后仅编辑选定的频率。这对于录音特别有用。除其他目的外，光谱选择^{(Spectral Selection)}和编辑可用于：

1. 通过去除频率来清理不需要的声音
2. 增强某些共振
3. 改变声音的质量
4. 从语音工作中删除口音。

希望这对你有用！

Reduce or Remove Background Noise using Audacity for Windows PC

While trying to dо а simple voice nаrration we might experience a continuаl and consistent hіss or whistling sound in the background. Troubled, unnecesѕarily by the issυe, we start looking for ways to resolve this issue and come acroѕs multiple tutorials. Unfortunately, many of these arе either plainly confυsing or pіtch for a premium product. Don’t worry, give Audacity software a try!

Audacity is a free, open source, cross-platform audio software for Windows. The easy-to-use software. We had covered this post earlier in which we learned the technique of splitting and merging Audio files using Audacity. Today, we will learn to reduce background noise in a recording via Audacity.

Reduce or Remove Background Noise

Noise Reduction

Audacity features ‘Noise Reduction’ audio effect. It can remove some kinds of noise from a recording. This effect works best with noises like background hiss. To have the noise levels reduced, you first select audio that is just the noise and create a ‘noise profile’. Once Audacity knows the noise profile, it can reduce the loudness of noise of that kind in audio you select.

To begin, add a voice file to the app. Audacity can import many common audio file formats, including WAV, AIFF, and MP3.

Next, look at the stereo waveform. The left channel is displayed in the top half of the track and the right channel in the bottom half. Observe that where the waveform reaches closer to the top and bottom of the track, the audio is louder. Notice the stereo wave pattern. It will show you which parts are quiet. Use your mouse and click and drag over a quiet part to select it.

Thereafter, switch to Effects menu. Audacity includes many built-in effects that let you use a wide range of plug-in effects. Besides, all effects that have a dialog let you hear the audio as modified by the effect before you apply the effect to the waveform.

Once accessed, go to ‘Noise Reduction’ click it to open a Window. Look for the option reading ‘Noise Profile’, and then hit Ok button.

Following this, select the part of the sound file that has the voice over. Repeat the same steps mentioned above, sequentially and modify the noise reduction level if required.

When done, select OK.

Now, you will find that the file’s wave pattern has changed as the noise levels have been reduced, gradually. Play the sound bite to verify it.

All this has been made easy in Audacity due to Spectral Selection capability. It is the characteristic feature within Spectrograms, which lets you view the frequency content of audio then edit just selected frequencies. This is particularly useful for voice recordings. Among other purposes, Spectral Selection and editing can be used for,

1. Cleaning up the unwanted sound by removing frequencies
2. Enhancing certain resonances
3. Changing the quality of a voice
4. Removing mouth sounds from voice work.

Hope this works for you!

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