音頻噪聲抑制

Laying down some vocals?? Starting your own podcast?? Here’s how to remove noise from a messy audio track in Audacity quickly and easily.

放下人聲？ 開始自己的播客？ 這是在Audacity中快速輕松地消除雜亂音軌中噪聲的方法。

This is the second part in our series covering how to edit audio and create music using your PC. Be sure to check out the first part in the series, where we covered the basics of using Audacity, and then check out how to add MP3 format support as well.

這是我們系列的第二部分，涵蓋了如何使用PC編輯音頻和創建音樂。 一定要檢查該系列的第一部分，其中介紹了使用Audacity的基礎知識，然后檢查如何添加MP3格式支持。

消除大膽的噪音 (Removing Noise in Audacity)

Open up your file in Audacity, and find the largest contiguous silence in the track.? What we’re going to do is find a baseline for the “noise” so that Audacity knows what to look for.? You can play through the audio to find some silence, but once you do, hit the “Stop” button, and highlight the silence by left-clicking and dragging.? It’s just like selecting anything else, really.

在Audacity中打開文件，并找到曲目中最大的連續靜音。 我們要做的是找到“噪音”的基線，以便Audacity知道要尋找什么。 您可以播放音頻以找到一些靜音，但是一旦完成，請單擊“停止”按鈕，并通過單擊和拖動來突出顯示靜音。 就像選擇其他任何東西一樣。

Next, go to Effect > Noise Removal.

接下來，轉到效果>噪聲消除。

You’ll see a window pop up like so:

您會看到一個彈出窗口，如下所示：

Click on the “Get Noise Profile” button and the window will go away.? Now, select the portion of the track you want to remove noise from.? For me, it was everything, so I hit CTRL+A to select all.?

單擊“獲取噪聲曲線”按鈕，窗口將消失。 現在，選擇要從中消除噪音的軌道部分。 對我來說，這就是一切，所以我按CTRL + A選擇了所有。

Again, go to Effect > Noise Removal.? By moving the slider for noise reduction, you’re telling Audacity how much to filter out.? Higher values will be more aggressive removal, while lower values will be more subtle.

再次，轉到效果>噪聲消除。 通過移動滑塊以減少噪聲，您可以告訴Audacity過濾掉多少。 較高的值將更積極地刪除，而較低的值將更微妙。

You can click the “Preview” button if you want to listen to a small snippet of your track.? You can leave the other two sliders alone, and hit OK when you’re done.

如果您想聽一小段曲目，可以單擊“預覽”按鈕。 您可以不理會其他兩個滑塊，并在完成后單擊OK。

Give your track a listen, and if you need to tweak, you can always hit CTRL+Z to undo and start over.? If you reduce by too much, the track will noticeably sound a little off.? It’s best to be more subtle, that way the audio still sounds natural.

試聽一下曲目，如果需要調整，可以隨時按CTRL + Z撤消并重新開始。 如果減少太多，音軌將聽起來有些偏離。 最好變得更微妙，那樣聲音仍然聽起來自然。

The changes may not be so obvious on the waveform, so I zoomed in to illustrate the smoothing of the waveform.? Here’s what it looks like before and after the effect is processed:

這些變化在波形上可能不太明顯，所以我放大以說明波形的平滑度。 效果處理前后的外觀如下：

Enjoy your noise-free audio.

享受無噪音的音頻。

翻譯自: https://www.howtogeek.com/howto/40469/the-how-to-geek-guide-to-audio-editing-basic-noise-removal/

音頻噪聲抑制