Tag: audio equalizer how to use

Volume equalizer, how does it work?


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Volume equalizer, how does it work?

Volume Equalizer

Many people ask us how an mp3, mp4, etc. They save so much space.

volume equalizer

First of all there is obviously the zip type compression. That is, those algorithms that reduce the space basically seeking to eliminate the redundancy of symbols. That is, if in a row you find: 11111110000000 what you do is put 7-1,7-0 implying that there are 7 times a one and 7 times a zero. You save space by describing what you write when you have repetitive characters.

This is just a very simplified example.

But there is also another compression that is based on knowing how the human ear works. We already know that there are low and high frequencies that the human ear does not perceive, so everything that is outside the hearing range of the human ear can be ruled out.

There is also masking, which implies that if two similar frequencies sound almost simultaneously, one of them at a higher volume, it will mask the second, that is, we will not hear the second, so it can be discarded.

It is obvious that all these processes cause information to be discarded and that can damage the quality, but in general, if it is done correctly, the human ear, even the trained one, cannot perceive the difference.

Thousands of tests have been done making people, including musicians, listen to high bitrate mp3s and listen to a WAV and it has been verified that they cannot tell the difference.


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HOW TO CORRECTLY USE AN EQUALIZER

An equalizer, concealer or equalizer in English, is a tool also used for recording, mixing or reinforcing sound, to increase or decrease the volume of certain frequency bands of a sound.

I – HARMONIC ANALYSIS OF SOUND

On the sound page, we have seen that the audible frequency spectrum, that is, the range of frequencies perceived by the human ear, extended from 16 to 20,000 Hz. Each sound has its own frequency spectrum corresponding to the “signature acoustics”. The 3 voiceprint examples below will allow you to practice frequency analysis.

equalizer
Example 1

This harmonic analysis is carried out from a wav file. There are 4 frequency bands (around 330, 660, 990, and 1600 Hz). We note that the 660 Hz band dominates with its strongest energy: it defines the dominant tone. The other bands are secondary tones. Voices are not the only voices featuring spectrums with particular dominant tones; This is also the case for musical instruments. This is what differentiates them from noises that also have secondary tones that overlap without any relationship between them.

Audio Equalizer

Example 2

Recording of a female voice characterized by a low-mid dominant spectrum. Low frequencies at the beginning of the low-mid range and in the bass register.

female_vote_equalizing
Example 3

Recording of a female voice, voiceover on television. The registration is more extensive in the range of low and low mids.

II – RECOGNIZING FREQUENCIES

The equalizer allows you to intervene in the frequency spectrum of a sound by increasing (increasing) or attenuating (cutting) certain bands. In this way, we can eliminate unnecessary or unpleasant frequencies, strengthen a voice, correct the instruments so that they do not overlap too much when playing simultaneously or create a musical style. Such manipulations must be exercised with discernment. Before embarking on frequency corrections, you must learn to recognize the most important frequencies of a sound. This will avoid big mistakes that could kill crucial ranges of the spectrum … A little too low or an exaggeration of the treble and the song will quickly transform into an amalgam of frequencies that will sound more like noise than music! In isolated sounds, identification of different frequency bands is relatively easy. Choose audio files for vocals or instruments instead of composite songs.

III – THE EQUALIZER SETTING

The correct setting of an equalizer is not obvious since there is no miracle recipe. Adjustments are just compromises for a set to keep its balance while making corrections on certain instruments. Musical tastes and sensibilities also influence the stages. Therefore, in this area it is difficult to give absolute rules, but we can reflect on the following points to avoid …

There is no need to cut entire ranges of the spectrum. Pay attention to strong fades in the mid range. You run the risk of getting a confusing set. Preferably make corrections in a very narrow spectrum or specific frequencies.

IV – GAIN OR  LIMITATER?

In a composition, most of the corrections correspond to attenuations that allow giving rise to each instrument. In some cases, a positive gain is applied to increase the presence of a voice or to give air to an ensemble. Corrections are generally between -6 dB and +6 dB, but we can also reserve a space for creativity by deviating from these values.