Tag: mp3 volume normalizer online free

Normalize the volume gain of an audio or video file


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During the first years of the appearance of mp3s, a constant problem, which had no solution, were the ups and downs in the volume of mp3 files. There were ups and downs in the volume level of each song.
It was essential to turn the volume knob to manually level the volume.

streaming music

There was no solution to the problem of leveling the volume gain of each mp3, to make the sonosrity of each mp3 file similar to the others.

Soon some ideas emerged, mostly based on looking for the peak of each song, to naively seek to increase the loudness or volume of that mp3, amplifying the mp3 until the peak reached its maximum possible level, without distorting.

Because in music, if the maximum volume level is exceeded, distortion occurs. And if we have looked for the high sound quality, it would be absurd for us to destroy that quality by introducing distorison in our attempt to level the volume of each mp3.

But this method of analyzing each fragment of the mp3, looking for the volume peaks, to then be able to calculate how much the song could be amplified so that that peak reaches its highest possible level, without reaching distortion, it did not get all the mp3s They will sound like that. What was intended was to improve the level of loudness, the level of gain and match them between the different mp3s.

That’s how ideas mature, like the Replay Gain. Where the well-known Mp3Gain came from.

But research and experimentation continued and soon similar paths followed those used in recording studios. A mixture of limiters, compressors, etc. that achieved a better result by matching the volume levels of an mp3.

youtube music

As the normalization algorithms were improving, audio formats began to be added. Looseless formats emerged and gained poipularity. And then it was no longer enough to normalize mp3s. Now it was necessary to normalize the volume gain level of many audio formats: ogg, flacc, acc, mp3, m4a, etc.

And soon, with the popularity of the video, it was also necessary to match the volume levels of the videos. Normalize videos became a daily necessity.

This is how Mp4Gain offers the possibility to normalize the audio of audio files and video files, in all the most popular formats.


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Mp4Gain Features
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Normalize audio: Normalization and normalizer

Normalization – Normalize audio

Normalization is an atypical dynamic process, very different from compression, limitation, expansion or noise reduction:

It does not reduce the relative dynamic range of the audio signal.
It is not applied in “real time”, or at the moment, but it is a process that is carried out “a posteriori”, on the previously recorded material.
The normalizer is a device that falls into the category of dynamics processors.

Analyze the target signal, detect its highest volume peak and increase its gain to the maximum level possible without distorting.
With the same proportion the level of the rest of the signal increases.
The signal, in general, will sound with a greater volume.

It is very unpleasant to have a playlist with mp3 files playing at different volumes. However, it is possible to normalize (equalize) the volume of our mp3s.

Loudness normalizer

You can use the Loudness Normalizer to obtain a specific loudness.

Increasing the loudness to a specific value may cause clipping. To solve it, a peak limiter can be part of the process. The Loudness Normalizer increases the loudness and limits the peaks of the signal at the same time if necessary, to obtain the desired loudness.

This process takes place in several stages, first an analysis and then the final rendering.

What is an audio compressor?

When we talk about compression we also talk about dynamic range. Recall that the dynamic range is the difference in amplitude between the lowest and highest part of a signal. In the compression process, basically and technically it consists in decreasing the dynamic range of a signal.

These are the most common controls or points to control in an audio compressor:

Threshold: This is the point from which the compressor will start working. Any signal that exceeds this point will be compressed.

Ratio: This is the reason for the compression that will be applied to the signal that exceeds the threshold. We see it and find it as 2: 1, 4: 1, etc. The first number means the number of input decibels that exceed the threshold, and the second number the output decibels. In other words, for “X” number of decibels that exceed the threshold, “Y” number of decibels will be output.

Attack: It is the time it takes for the signal to compress after having exceeded the threshold. We see it and find it commonly expressed in milliseconds (ms).

Release: How soon the compressor stops working after the signal falls below the threshold.

Knee: This is a parameter that subtly modifies the compressor threshold. A low setting (Hard knee or 0) means that the compressor will act only from the set threshold. A high setting (Soft knee) will allow the compressor to act gradually from before the signal reaches the threshold. In this way, the threshold can be treated as a range and not as a specific point. As the signal approaches the threshold compression increases. When it exceeds it, it continues to increase until the entire compression ratio is applied.