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What is the MP3 compression principle?

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What is the MP3 compression principle?

Mp3 Volume Booster

In fact, there are many audio compression technologies and MP3 compression technology is not the best.

Volume Booster

But now it seems that it is still mainstream.
Musical signals have many redundant components, including spacing and information that the human ear cannot distinguish (such as weak signals mixed with a strong background). The CD sound is not compressed and uses a fixed sampling frequency of 44.1 kHz, which can ensure good playback of maximum dynamic music. Of course, the amount of data is the same where the amount of information is less, so there is a possibility of compression. The audio bandwidth of 20 ~ 20 kHz (upper CD player can be extended up to 2 Hz) has become the current music standard. To reduce sound distortion, MP3 adopts an encoding algorithm called “sensory encoding technology”: the audio file first undergoes spectral analysis during encoding, and then the noise level is reduced by filter, and then the remaining components are quantized by quantization The bits are scattered and arranged, and finally an MP3 file with a higher compression ratio is formed, and the compressed file can achieve a sound effect closer to the original sound source during playback . Although it is a lossy compression, its biggest advantage is very little sound distortion in exchange for a higher compression ratio. And now MP3 adopts a variable compression ratio (VBR) compression technology similar to Dolby AC-3. The sampling compression ratio depends on the amount of information in the music, and the masking effect of the human ear is used to reduce redundant data.

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Volume Enhancer

When you have a good amount of mp3s or in any other format, you always wonder how you can improve the quality of the audio, as well as standardize the volume level.

Mp3 Volume Enhancer

Although we are going to refer to mp3, this applies to many other formats since Mp4Gain is capable of compressing and converting into many audio and video formats and also normalizes the volume to standardize it so that they all have a sound or sound similar to each other. .

The operational part is very simple, since it will suffice to load one or more files in any format (Flac, OGG, mp3, m4a, etc) and convert them to any other. If you want (and it is recommended) at the same time, you can normalize the volume of all of them so that they sound at a fairly even volume level.

Audio & Video Volume Enhancer

As we already mentioned, Mp4Gain can operate simultaneously on audio and video files, managing to do volume enhancer on all of them one after another.

We can even choose to have them all, say, converted to Flac or any other format. Or each one can be processed and after normalizing its volume, a final file can be obtained from each one in the original format that the original file had.
As you will see, Mp4Gain is very versatile and allows us to choose exactly how we want it to work and it is very easy to operate, it does not need a learning curve.

Enhance Volume level of video and audio files

Undoubtedly we have all known the frustration produced by corroborating that our video or audio files (mp3, flac, aac, avi, mpeg, mp4, etc.) have a different loudness and this is noticeable when playing them!

Enhance volume level

Why do the videos or audio files have different loudness?

The reasons can be many. Since the time they were recorded, since in recent years the so-called “volume war” was generated by music producers.

enhance volume level

When sound louder is synonymous with having better sound

And this was because it was discovered that if an audio sounds a little louder, the human ear can perceive it as sounding better.

Indeed, exhibitions were carried out where people (including musician and music professionals) were made to listen to an aido and then they were made to listen to one that had 8% or 10% greater loudness … and the + 95% perceived that the second (which only sounded louder) sounded “better”.
So many products, almost all of them, especially dance music, por, rock, etc. They began to sacrifice the dynamics of the music and gave a little boost to the volume of their productions. But this was a little bit at the beginning, but when everyone went up a little bit, others went up higher and thus began a career that is known as the volume war.

What is the dynamics of music?

Much music with all intentionality has low volume passages and contrasts with others of high sonority. This gives expressiveness to the music, it is another resource to be able to transmit sensations, perceptions, feelings, atmospheres, etc.

The volume war ended that dynamic, making the whole song sound all the time at maximum volume, without reaching distortion. In other words, the only limit was that: the distortion.

Give it all the volume, staying on the edge of distortion.

Then, we will understand that the time in which it was recorded has a lot to do with the loudness of our music or our video.

There are also technical elements. The combination of bitrate, with bipt depth and sample rate, among others (equalization, etc) are other elements that help make each recording have its own loudness.

When having different loudness becomes a problem

Previously, if we listened to a song from a vinyl record or watched a video from a video cassette, to listen to another, it was necessary to change the vinyl record or the video cassette … and those seconds of pause did not make us perceive the difference in loudness that they possibly had both recordings between them.

Now, in the digital age, with playlists, a song begins just after the previous one ends, just as it happens with videos. And the end of one recording is so close to the beginning of the next one, that we perceive the difference in loidness clearly … and we don’t like it.

Mp4Gain is the software (the only one) that can normalize video and audio files of the most popular formats. You can even normalize and convert them at the same time. That is, if you have a music video and want to convert it to mp3, you can normalize and convert it in one step. Even if you have a flac and want to convert it to mp3 or if you have a vi and want to convert it to mp4 and in the process normalize it, quite with the click of a single button.