Search Type:
Keyword:

·You are here:Home > News

Mixer technical knowledge

 Date:2014/3/14 1:59:44 Views:2916

When solving the problem of the sound system, often a key equipment, mixer which this paper briefly introduces the main functions of the mixer and the use the matters needing attention, aims to discuss with you.

A, mixer main functions:

Mixer is a focus on pools of water plant, the whole working process is like water to a variety of audio signal input into the big pool, and then in the pool of water flowing in a variety of reasonable processing, and then from various channels.

The mixer of signal input

Mixer of the input signals can be broadly divided into low resistance microphone input and high impedance circuit signal input two kinds. Each input can regard it as a stream all the way, that is if a mixer with multi-channel signal input as if there are multiple streams of water into the mixer for processing, but is different, the speed of the water low-resistance flow slower, high resistance water faster; Of course two different water flow into the mixer, high resistance of flow faster, flow into the mixer is suitable, low-resistance flow is slow, you need to auxiliary power will slow flow into a fast stream, also is suitable to flow into the mixer, so the low impedance mixer have built-in amplifier circuit in the input channel, the low level to the appropriate level.

2. The channel gain adjustment

Mixer each input channel gain is key, but a lot of tuner seem to gain simply as a volume knob, it is wrong. Actually gain is mainly used to control the input signal dynamic range, the maximum gain transferred to no distortion is the effective dynamic range of the largest, also make better effect. Mixer in the input channel and the input circuit has a basic background noise, this is not to eliminate background noise. If the dynamic range of gain adjustment is insufficient, the background noise can dash forward show come out, then the quality must be bad; Gain adjustment of dynamic range is larger, more reasonable, the sound quality would be good; Certainly not gain the bigger the better, to a degree, right.


3, the adjustment of the mixer channel equalization group after the gain set, generally will adjust the balance of the mixer channel group the next, adjust the sequence should be from bass part first, then adjust the high part of the. Because only the basis of guarantee the sound, to guarantee the multiple harmonic sound good. At present, the professional mixer balanced group with frequency selective adjustment, the actual operation, if you feel the bass music when put music, can put the music channel equalization group's bass frequencies around 200 hz, then use doing moderate adjustment knob to ascend, such efforts in the bass came out; Can also use a balanced set of frequency selective function to suppress acoustic feedback, such as general karaoke bars within the 300 hz or so there's a resonance peak, often easy to produce the frequency acoustic feedback, can be to choose the microphone input channel frequency in about 300 hz, then use doing moderate adjustment knob attenuation, so can effectively reduce acoustic feedback. , of course, each producing acoustic feedback frequency is not the same, but whatever the frequency of the acoustic feedback, can use this method simple control, of course, this need to flexible control according to the experience of the tuner.

4, the adjustment of the mixer channel AUX

AUX term is: auxiliary sends control. Different mixer in the AUX part can be divided into multiple, the principle of it and the pusher, just most of the volume of the AUX switch knob is used to control, the most main is actually understand AUX knob and function of the volume of the mixer is so as you can. Will say next AUX group under the specific method of use: AUX is most commonly used for external of vocal effects, the sound need to be processed with the corresponding AUX switch sent to the effect, after processing to return to the radio. Large mixer AUX would have a pusher before/after conversion, when set in front of the pusher, the passage below the total volume of the volume of the pusher can't control the road AUX. On the contrary it is controlled by the channel of the total volume. AUX other function is for monitoring or recording.

5, mixer audio-visual balance adjustment

Mixer audio-visual is generally understood, but many people's understanding of the more rigid, such as a two channel stereo music signal input to the mixer, the vast majority of people would put the two channels of audio-visual knob to the left and the right to the end, that is "stereo", in fact, so the two channels will appear to be floating out voice, weak, weak middle; Played in the middle if the audio-visual knob will feel listened music sounds very high very suffered, and the width of the sound is not enough; The best location is on the left channel of audio and video button to clock at 9 o 'clock position to the right channel of audio-visual knob to clock 15 point location, this music can neither FaPiao, wide dynamic range, and penetration and better.

6, adjustment of mixer part the main output

Mixer's main output part refers to the marshalling the volume and total volume. Such as make up to 1-2 marshalling the computer; Put the receiver in the 3-4 marshalling; Turn the bass by 5-6 marshalling to control, the secondary speakers by 7-8 marshalling the volume control and so on, in general there are multiple marshalling mixer is better and convenient control. Other marshalling marshalling signals can choose a single output signal or cuts mixer to the master level hybrid control. Other such as channel pusher is very simple, but according to each input channel of pusher, flexible control volume adjustment is simple but very important part of this section, mainly observe various signal input and output signals, there can be a serious distortion.

Second, the mixer used points for attention

1, AUX part need to pay attention to the problem

AUX pusher before/after the transformation, the standard requirements to the stage on monitoring signal with a clipper before sending, but after the performance in general or a pusher sent better. AUX signal is used as the monitor, for example: with AB two CD players take turns to play music, as A Taiwan music played out just down the road is so volume can turn off the sound, then the volume of the B pusher up the road. But at the moment A CD machine could play discs, is still in play, this time if it is sent after the pusher AUX signal, speakers will not have A CD in sound, but if the pusher AUX signal sent by A former, speakers will be continued to send out the voice of A CD, that speakers will also have A, B two CD machine.

2, marshalling allocation problem

Problems need to be aware of marshalling is simpler, because all the volume of the marshalling can separate output without having to switch into the master level, so need to be careful in the middle of the marshalling, such as: use 1-2 marshalling to control the volume of the bass, that most of the input channel tuning stage marshalling 1-2 can press down, but if the receiver channel will be careful, otherwise press the receiver channel 1 or 2 marshalling will generate bass sound feedback; Since there is 1-2 marshalling has relative independent output should be the output signal from behind, don't again by mixer the total volume of output, which is 1 to 2 marshalling to the mixer of the total volume can't press the switch.

3, phantom power supply

Most inside the mixer can have the illusion of a 48 v power supply, it can be used to promote a variety of condenser microphone, but because it is from the microphone line current, so check the microphone line, ensure smooth line or line contact is not good when will be made a lot of current shock.

4, audio input

Most of the mixer of audio input channel is through simple control and directly through the mixer total volume of the output, so be careful operation, do not produce wrong operation, suddenly the sound recording channel volume from the mixer's main out.

5, output level

Recording is the standard level 0 dB, but in practice usually out of many, even to + 10 dB, so don't panic, a look at the red light is actually in the real use of signal level slightly overweight is reasonable, at that time the sound effect is best. There is a need to be aware of is that when the peak level indicator to + 4 db, behind the volume level and its corresponding output to reach 0.775 v 0 db.

6, other function button

In addition to the important adjusting knob, tuning stage and there are many function knob, button or switch, such as: positive and negative phase conversion button, high cut or low conversion button, mute button before and after the cut button, pusher, monitor button, etc., some frequently used to skilled, often do not use on the basis of understanding its basic function, don't often go to adjust them, lest produce wrong operation.



         

Previous:浅谈KTV历史由来及KTV音响设备配置    下一条新闻:计算你房间的混响时间

广州市镭声威科技有限公司 2013版权所有 Copyright 2013 Auto Parts All Right Reserved


粤ICP备13082240号 技术支持:出格