That is why it is no longer viable to use it as a normalization method. Today the different devices that play music read and follow the Replay Gain? Nope.

Of course, we are giving a very simplified explanation, so that it is easily understood. This is saved in a tag in the file and so, when it is run, the music player program knows what amplification it should automatically give to make them sound at very similar levels.

Mp3Gain, based on Replay GainĪll this set of theories and measurements are called “human perception” and then a file is measured in what perception it produces and it is calculated what modification a second or third file needs to sound with a similar perception. How did he achieve it? For example, based on the masking effect that says that two sounds that are close in time, if they have similar frequencies, it will happen that the first one masks the second, that is to say, this second one is redundant and is not heard by the human ear. Later an algorithm emerged that calculated the perceptionĪnd not the spikes. Mp4Gain, in addition to normalizing audio and video files, is a functional option today as we will see later. That is, all the songs had the peaks at the maximum possible level without distortion. Then I used that “factor” of possible amplification and amplified the entire recording / song to increase the peaks.

Decades ago there was the so-called peak normalization, which in a simple way, measured the volume peaks of a recording and calculated how much they could be amplified before reaching distortion.

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