The full name of the equalizer is the room equalizer. It has a wide range of applications in audio systems, but in most cases it does not play its due role. It is an electronic device that can separately adjust the amplification of electrical signals of various frequency components. It compensates for defects of 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 mixer can only adjust the three-stage frequency electrical signals of high frequency, intermediate frequency and low frequency respectively. In a communication system, the insertion of an equalizer in the lanyard system can reduce the effects of intersymbol interference. A filter that is inserted in the baseband or intermediate frequency portion of the communication system to reduce inter-symbol interference and to compensate. Divided into frequency domain equalizer and time domain equalizer. Frequency domain equalizer The frequency domain equalizer utilizes the frequency characteristics of the tunable filter to compensate for the amplitude-frequency characteristics and group delay characteristics of the actual channel, so that the total frequency characteristics of the entire system including the equalizer satisfy the inter-codeless interference transmission condition. Time domain equalizer The time domain equalizer is directly considered from the perspective of time response, so that the impulse response of the entire transmission system including the equalizer satisfies the condition of no inter-code interference. The frequency domain equalization satisfies the requirements of the Nyquist's plastic theorem, and the condition that the decision point satisfies the inter-symbol interference is relatively loose. Therefore, in the digital communication, the general time domain equalizer is used more. Time domain equalizers can be divided into two broad categories: linear equalizers and nonlinear equalizers. If the result of the decision in the receiver is fed back to the parameter adjustment of the equalizer, it is a nonlinear equalizer; otherwise, it is a linear equalizer. In a linear equalizer, the most common equalizer structure is a linear transverse equalizer, which consists of a number of tapped delay lines with a delay time interval equal to the symbol interval. There are many types of nonlinear equalizers, including decision feedback equalizer (DFE), maximum likelihood (ML) symbol detector and maximum likelihood sequence estimation. First, the equalizer as a tone controller A few days ago, I went to a certain unit to participate in an activity. Because of the sensitivity of the profession, I went to the sound control room and found that the potentiometers of the 31 frequency points of the equalizer in the audio cabinet were neatly set into the shape of the two heads and the middle bottom. Just ask, the voice controller said that the sound is so good, I can't help but be dumb. There is no such thing, there is also a sound system, the equipment is very high-grade, all-in-one imported goods, but found that the equalizer potentiometers are in a straight line, I think the ideal venue, the frequency response will not be a straight line Let's go! Second, the equalizer as a feedback suppressor One day, I went to participate in the system's acceptance and found that the potentiometer faders of some frequency points in the equalizer were at the bottom, and asked the technical staff of the construction unit. He told me that this is the frequency of some whistling. Point, I will attenuate it to the maximum, and howling will not happen. I can't say it! Try it again soon. So he took out the flower tube and pushed the FM volume fader up. The result was still a howling. He is not okay. Third, the equalizer as a necessary configuration of the sound system At present, there are more outdoor plaza activities, and the number of mobile sound reinforcement equipment is increasing. However, the author finds that most of the systems are equipped with equalizers, and they are all in working condition. Most people who are engaged in sound control can’t say the truth, anyway, they are equipped with Use it. All of the above can be said to be a more common phenomenon. The use of small equalizers to complement the effects of the entire sound system, and vice versa, undermines the stability and balance of the system. We know that an equalizer (specifically a room equalizer). Its role is very specific, and it is clear that the frequency response of the sound system and the site where it is located is compensated, so that it can achieve the sound in a relatively straight frequency response characteristic, and has no other effect. Any expansion of its scope of use is your wishful thinking. Generally, our common equalizers are mostly graphic, 31 segments. The so-called graphic type is the position of the compensation potentiometer on the panel. The height of the potentiometer fader intuitively reflects the adjusted frequency point and the boost or attenuation value. The compensation curve is the position curve of the potentiometer fader. . I split the data of the equalizer to explain their interactions. 1. 20Hz--60Hz part This promotion can give a strong feeling to the music, giving people a very loud feeling, such as thunder. It is a powerful and powerful feeling in music. If the elevation is too high, it will be turbid, resulting in poor definition, especially for low-frequency response and low-frequency audio equipment. 2. 60Hz--250Hz part This is the low-frequency structure of music, which contains the basic sounds of the rhythm part, including the main sound of the pitch and rhythm sounds. Its ratio to the high-pitched tone constitutes the balance of the tone structure. Raising this section will make the sound full, and excessive boost will make a rumble. Attenuating these two segments will make the sound thin. 3. 250Hz--2KHz part This section contains the low-frequency harmonics of most instruments, and if you increase too much, the sound will be like the sound in the phone. Excessive elevation of 600Hz and 1kHz will make the sound like a horn. If the 3kHz is raised too much, the speech recognition tone will be masked, that is, the articulation is unclear, and the lip sound "mbv" is difficult to distinguish. If you increase the 1kHz and 3kHz excessively, the sound will have a metallic feel. Since the human ear is sensitive to this frequency band, this segment is usually not adjusted, and excessively increasing this segment will cause hearing fatigue. 4. 2KHz--4kHz part This frequency is an intermediate frequency. If it is raised too high, it will cover up the speech recognition tone, especially if the 3kHz boost is too high, it will cause hearing fatigue. 5. 4kHz--5KHz part This is a frequency band with a sense of presence that affects the clarity of sounds such as languages ​​and instruments. Raising this frequency band makes people feel that the distance between the sound source and the listener is a little closer; if the attenuation is 5 kHz, the distance of the sound will be farther; if it is raised by 6 dB at around 5 kHz, the sound of the whole mixed sound will be made. The power is increased by 3dB. 6. 6kHz--16kHz part This band controls the brightness, macro brightness and sharpness of the tone. Generally speaking, raising these segments makes the sound loud, but it is not clear. It is impossible to cause the tooth to be too heavy. When the sound is attenuated, the sound becomes clear, but the sound is not loud. The equalizer can also be set according to the limit graph, or it can be self-provisioned. Let the ear feel the sound most easily, so the most natural and best! Don't impose ~ that would rape your ears.
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