(it's important to pay attention to the order):
　　1.EQ：
EQ is equilibrium. Because there are differences in the pickup curve of the microphone and the voice characteristics of the singer, it is generally handled appropriately according to the actual function of the recorded voice. For example, some singers sound too sharp, some sound very stuffy, some have heavy nasal sounds, and some have heavy lip and tooth sounds. These are the auditory differences caused by the imbalance of the strength of each frequency band. It can equalize (increase or decrease) the sound signal of each frequency band through EQ, which can play an improvement role.
2. Motivator:
The stimulator, also known as harmonic generator, can add some random harmonics in some frequency bands of sound. Appropriate encouragement will bring beautification to the sound. The difference between the stimulator and EQ is that EQ only adjusts the signal strength of some frequency bands, while the stimulator adds new acoustic components in some frequency bands. However, inappropriate encouragement can damage the sound and make the sound very "dirty", so many people often don't do encouragement.
3. Constrictor (pressure limiter):
The compressor can actively adjust the dynamic scale of the sound level. Generally speaking, it is to actively process all the sound signals on the time track as follows: when the sound is small, increase the volume according to the preset parameters; when the sound is large beyond a certain boundary, start to reduce the volume according to the share of the preset parameters, The final result is to change the dynamic scale of the whole sound track (the difference between the maximum volume and the minimum volume). Usually, the function of the pressure limiter is to reduce the dynamic scale. The sound passing through the pressure limit sounds fuller and more powerful. It doesn't bother in places with small sound, and it doesn't shock in places with large sound.
4. Reverberators:
The reverberator can beautify the sound, make the sound sound have a sense of space, and the sound is round and transparent.
The following methods are commonly used for noise removal:
1. Noise door:
Set the threshold value of a level, filter out all the signal levels lower than this threshold, and pass all the signal levels higher than the threshold value (here, the signal level refers to the level of the sum of signal and noise levels). This kind of sound data with high signal-to-noise ratio does not need denoising. Rvox in the wave plug-in is the actor of such a noise gate. How many parameters are appropriate? It is generally about - 50 ~ - 40dB, but the actual background noise is not certain, so it needs to be tested by yourself. The correct orientation is not to hear the background noise, but the minimum sound made by human voice is not filtered out.
2. Sampling denoising method:
This is a useful way for professional audio processing software to remove the continuous and stable set noise. The principle of noise removal is to sample the waveform samples of the noise, and then analyze the waveform and sampled noise samples of the whole section of data to actively remove the noise. The advantage of this noise removal is that it can completely remove the noise. The defect is that it can damage the original human voice quality. The lower the signal-to-noise ratio, the greater the damage. Through this noise elimination, the metal smell is very strong. Therefore, this method is generally not recommended to denoise the singing voice. The key to solving the problem is to control the highest signal-to-noise ratio in the early recording as far as possible.
3. Other noise removal methods:

Analyze the frequency band of the noise place with the spectrum, and attenuate the frequency band signal level of the bottom noise place through the adjustment of Eq. However, the signals of the original vocal band are also attenuated, which will pose a new problem, so they are also used less.
EQ treatment:
The spectrum dispersion of human voice source is special. As far as its pronunciation method is concerned, it has three parts: first, the music generated by vocal cord vibration. The pronunciation of this part is flexible, and the spectrum changes greatly with different pitch and pronunciation methods; The second is the low-frequency Kai tone generated by nasal consensus. Frequency equalization can roughly separate these three parts of the spectrum. The frequency band used for nasal tone conditioning is below 500Hz, the midpoint frequency of equalization is generally 80-150hz, and the equalization bandwidth is 4 octaves.
For example, 100Hz can be set as the midpoint of frequency equalization, the equalization curve should transition steeply from 100-400hz, and the conditioning scale of equalization gain can be + 10dB ~ - 6dB. Here we should be reminded that the monitoring speaker during the adjustment of this project shall not use the box with weak low-frequency pronunciation, so as to prevent the nasal sound from being aggravated unintentionally. The spectrum of human voice and dental sound is scattered above 4kHz. Since this frequency band includes part of the music frequency spectrum, it is proposed that the frequency band for conditioning tooth sound should be 6 ~ 16KHz, the equalization bandwidth should be 3 octaves, the equalization midpoint frequency is generally 1 / 2 octaves, and the equalization gain can be reduced to - 10dB as a minimum.
From the above analysis, it can be seen that during the frequency equalization of human voice, the broadband equalization with steep curve shall be used as much as possible to improve the frequency band for an outstanding sound feeling. This is to make the spectrum of nasal, musical and dental sounds of human voice spread evenly and coherently, so as to make their pronunciation natural and smooth.
The improvement of 1 / 2 octave narrow-band equalization is very easy to make the human sound source strange. Although this equalization method can greatly change the sound color of the sound source, if it is not for special effects, the equalization of singing pronunciation should be based on the natural sound feeling. In order to carry out specific function processing on the basis of not damaging the natural sense of human voice, 1 / 5 octave band equalization processing can be used. The following scenes are detailed.
(1) due to narrow sound sense and lack of thickness, 1 / 5 octave attenuation can be applied at 800Hz, and the maximum attenuation can reach - 8dB.
(2) the sound feeling is very bright, but it is weak and lacks penetration. 1 / 5 octave attenuation can be used at 6800hz, and the maximum attenuation value is - 3dB.
(3) the rolling tooth sound has a sharp sound sense, and the "Shh" sound lacks clarity. It can be attenuated by 1 / 5 octave at 6800hz, and the maximum attenuation can reach - 6dB.
For the equalization of sound source, it is best to use the equalizer that can show the equalization curve. For example, the equalizer of all digital mixer has the function of showing the equalization curve. In this way, the shape of the equalization curve can be seen during equalization processing, which brings convenience for future readjustment.
Generally, the equalization gain adjustment button on the equalizer of digital mixer is indicated by "g", the equalization frequency adjustment button is indicated by "F", and the equalization bandwidth adjustment button is identified by "F" or "Q".
Article source: Jiangmen recording production http://www.sjttv.com