An equalizer is an electronic device that can separately adjust the amount of electrical signal amplification of various frequency components. It compensates for defects in the speaker and sound field by adjusting the electrical signals of different frequencies, and compensates and modifies various sound sources and other special effects. The equalizer on the general mixer can only adjust the three-stage frequency electrical signals of high frequency, intermediate frequency and low frequency respectively. Strictly speaking, the equalizer should be used to correct the sound according to the frequency response curve of the sound. That is to say, the frequency response curve of the sound is not a horizontal straight line, but in order to restore the sound, we can adjust the equalizer. The original curve becomes a straight line. But most of my friends don't have this condition. I don't know the frequency response curve of headphones or earphones, so we can only adjust according to our own hearing.
Equalizers fall into three categories: graphic equalizers, parametric equalizers, and room equalizers.
1. Graphic equalizer:
Also known as chart equalizer, through the distribution of push-pull keys on the panel, the balanced compensation curve can be visually reflected. The improvement and attenuation of each frequency can be seen at a glance. It uses constant Q-value technology and has a push-pull for each frequency point. The potentiometer does not change the frequency bandwidth of the filter, regardless of whether it is boosted or attenuated. The commonly used professional graphic equalizer is to adjust the signal of 20Hz~20kHz into 10 segments, 15 segments, 27 segments and 31 segments. In this way, people select different frequency equalizers according to different requirements. Generally, the frequency points of the 10-band equalizer are distributed at octave intervals. In general, the 15-band equalizer is a 2/3 octave equalizer. It is used in professional sound reinforcement, and the 31-band equalizer is 1/3 octave equalizers, most of which have the need for fine compensation in the more important cases, the graphic equalizer is simple and straightforward, so it is widely used in professional audio.
2. Parametric equalizer:
The equalizer that can be finely adjusted for various parameters of equalization adjustment, is attached to the mixer, but also has an independent parametric equalizer. The parameters of the adjustment include frequency band, frequency, gain and quality factor Q value, etc., can beautify (including ugly) and modify the sound, so that the sound (or music) style is more prominent and colorful, to achieve the desired artistic effect.
3. Room equalizer:
The equalizer used to adjust the frequency response characteristic curve in the room, due to the difference in the amount of absorption (or reflection) of the decorative material to different frequencies and the effect of the normal resonance, it is necessary to use the room equalizer for the sound construction. Frequency defects are objectively compensated for adjustments. The finer the frequency band is, the sharper the adjusted peak is, that is, the higher the Q value (quality factor), the finer the compensation during adjustment, the thicker the frequency band is, the wider the adjustment peak is. When the sound field transmission frequency characteristic curve is more complicated, it is more difficult to compensate.
The development trend of the equalizer:
With the advent of the digital age, digital mixers have become a trend, so digital equalizers using digital filters have gradually evolved. The digital equalizer can be used as both the Graphic EQ and the Parametric EQ. It not only has excellent performance indicators, but also is easy to operate. It can also store multiple frequency responses at the same time. The equalization feature is available for different program requirements and can store up to 99 frequency response characteristics.
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