Applications

How to Amplify, Normalize, and Improve MP3 Audio Quality in Windows Using Audacity

Today we are going to talk about the way to amplify, normalize and improve the quality of MP3 audio in Windows with Audacity , very important for improve the quality of voice recording .

Anyway, before starting, it is recommended to download the latest version of Audacity , remember that this is a completely free application.

Amplify mp3 audio with Audacity

Amplifying audio is a simple way to increase overall volume of a track. This is one of the most basic options that we find in Audacity and it is done in the following way.

  • The first thing to do is to select all audio . You can do it faster by pressing the Ctrl + A key key combination .
  • Once you have selected all the audio, go to the section » Effet «.
  • Here you will find the option " Amplify «. Keep in mind that by default the highest boost value will be handled at 0,0, which is the maximum volume point.
  • However, if for some reason you wish to amplify beyond the limits (causing audio distortion) you will need to activate the option " Allow the clipping «.
  • Once the configuration is complete, simply click on the option " OK «.

Use the normalization tool

Normalization seeks to bring all the peaks in an audio to a similar level, that is, the volume is very similar throughout the recording.

  • To apply this effect, select the audio to which you want to apply normalization.
  • Now go to the section » Effet "And select the option" Normalize » .
  • You will need to select the peak amplitude you want in decibels (it is certainly not recommended to make more settings) finally press the key. OK .

In addition to this action, it is advisable to remove background noise from audio recording with Audacity , which greatly contributes to improving the sound.

Use compressor for mp3 audio with Audacity

The squeeze tool can help balance audios and is highly recommended for improvement adequate sound and voice when singing or speaking with Audacity .

The compressor is a bit more complicated than the amplifier, however, knowing what each point is for, it will be easier to apply it.

  • Threshold: the threshold is the one that determines when the volume changes will be made. In other words, all values ​​above the threshold value will be changed to reduce this volume. The threshold will depend on what you want to achieve, if it is narration, a setting of -15 dB would suit.
  • Lower noise limit: the purpose of this function is to limiter the volume of background noises or whatever is quieter. The values between -50 et -40 dB are generally processed .
  • Proportion: this will depend precisely on the nature of your project, for the narratives, the values ​​between 1,8 and 3,0 are not bad. In any case, if the recording has a large dynamic range, you may need to deal with higher values.

  • Attack time: represents from what point before the peaks the compression effect will be applied.
  • Temps de decrease: time to decreasing is the exact opposite of attack time, that is, it indicates at what point the effect will be applied after peaks. Now that you know the settings in a nutshell, it's time to start the process.

Apply the compressor in Audacity

  • The first thing to do is to select audio .
  • Once the audio has been selected, go to the »tab Effet «.
  • There, search " compressor And set the parameters that you consider valid compared to what has been shown before.
  • It should be noted that there are two boxes " Gain composition for 0 dB after compression " and "Peak-based compression" , the truth is, we don't recommend activating any.
  • After making the changes, click on the " OK And the compression will be applied. As you will see, you will get a much more balanced sound.

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