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Basics of using a microphone

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Time: 2018-09-14

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teanma小编一起去了解了解麦克风的基本使用吧。 Maybe many people think that picking up the microphone is enough to speak. In fact, otherwise, if you want to make the microphone produce high-quality sound, its use is also particular about it. Now let ’s learn about the basic use of the microphone with teanma Right.

The choice of microphone should be based on the use of the situation and the requirements of sound quality, combined with the characteristics of various microphones, comprehensive consideration and selection. ;作一般扩音时,选用普通动圈式即可;当讲话人位置不时移动或讲话时与扩音机距离较大,如卡拉OK演唱,应选用单方向性、灵敏度较低的传声器,以减小杂音干扰等。 For example, high-quality recording and broadcasting mainly requires good sound quality. A condenser microphone, an aluminum ribbon microphone, or an advanced dynamic microphone should be selected . For general sound reinforcement, an ordinary dynamic coil can be used. When the speaker moves from time to time, Or the distance between the speaker and the amplifier is large, such as karaoke singing, should use a unidirectional, low sensitivity microphone to reduce noise interference and so on. The use of condenser microphones requires phantom power. Generally speaking, the technical parameters of the microphone indicate the power supply voltage. To select a phantom power of a suitable voltage, the mixer is usually equipped with 48V phantom power.

The choice of microphone should be based on the use of the situation and the requirements of sound quality, combined with the characteristics of various microphones, comprehensive consideration and selection. OK演唱,应选用单方向性、灵敏度较低的传声器。 For example, high-quality recording and broadcasting mainly requires good sound quality. A condenser microphone, an aluminum ribbon microphone, or an advanced dynamic microphone should be used . For karaoke singing, a unidirectional and low-sensitivity microphone should be used.

In use, you should also pay attention to:

1.Impedance matching

3:1以上,则会影响传输效果。 When using a microphone, the output impedance of the microphone is the same as the input impedance of the amplifier, which is the best match. If the mismatch ratio is more than 3: 1, it will affect the transmission effect. For example, when a 50Ω microphone is connected to a 150Ω input impedance amplifier, although the output can be increased by nearly 7Db, the high and low frequency sounds will be significantly lost.

2, connecting line

The output voltage of the microphone is very low. In order to avoid loss and interference, the connecting wire must be as short as possible. A high-quality microphone should use a double-core twisted metal shielded wire. Generally, a microphone can use a single-core metal shielded wire. 5米,否则高音将显著损失。 The length of the high-impedance microphone transmission line should not exceed 5 meters, otherwise treble will be significantly lost. Low-impedance microphone cable can be extended to 30m--50m.

3. Working distance and near-talk effect

750px--1000px为宜,如果距离太远,则回响增加,噪音相对增长;工作距离过近,会因信号过强而失真,低频声过重而影响语言的清晰度。 Generally, the working distance between the microphone and the mouth is preferably between 750px and 1000px. If the distance is too long, the reverberation increases and the noise increases relatively; if the working distance is too close, it will be distorted due to the strong signal and the low frequency sound will be affected Language intelligibility. This is because the directional microphone has a "close-talk effect", that is, low-frequency sound will be significantly improved when speaking at close range. However, sometimes singers deliberately use "Near Effects?" To make the singing more beautiful and beautiful.

4. Angle between sound source and microphone

Each microphone has its effective angle. Generally, the sound source should be aligned with the center line of the microphone. The larger the deflection angle between the two, the greater the treble loss. “隆嘤”的声音,这时把麦克风偏转一些角度,就可减轻一些。 Sometimes when using a microphone, there is a sound of "booming". At this time, the microphone can be deflected by some angles to reduce it.

5.Microphone position and height

When amplifying, do not place or point the microphone close to the speaker first, otherwise it will cause howling.

;当人数众多时,麦克风应选择平均高度放置,并适当调配演唱者和伴奏以及队中各种乐器的位置,勿使响的过响,轻的过轻,而且要使全部声响都在麦克风有效角度以内。 The height of the microphone should be determined by the height of the sound source. If one person speaks or sings, the height of the microphone should be consistent with the singer's mouth . When there are a large number of people, the microphone should be placed at an average height and the singer should be appropriately deployed The position of the accompaniment and various instruments in the team should not be too loud, light too light, and all sounds should be within the effective angle of the microphone. If there is a lead vocal or lead, if necessary, a dedicated microphone should be placed.

When several microphones are used simultaneously, the parallel connection method can be adopted, but the phase of several microphones must be paid attention to. Only when the phases are consistent, they can be connected in parallel, otherwise they will interfere with each other and reduce the output and distortion. "短路",使输出电压降到很低。 Microphones of different models and different impedances should not be used in parallel, because high-impedance microphones "short-circuit" and reduce the output voltage to a very low level. Normally, microphones are used directly in parallel, and the effect is not as good as a single microphone.

If several microphones are used for one person's presentation at the same time, instead of separating several places for different purposes, it is better to choose the same model of microphone. Otherwise, the pitch of the speech will be changed due to the speaker's walk or angle change.

The microphone should be protected from knocks or falls during use. It is not advisable to test the microphone by blowing or hitting it, otherwise the microphone may be easily damaged.

“噗噗”声。 When the microphone is used outdoors or when recording voice, a windshield should be used to avoid recording the “beep” sound of wind . The draft shield also prevents dust from contaminating the microphone.

When using a wireless microphone:

(1) Choose a location for the receiver to avoid "dead spots".

(2) When receiving, adjust the angle of the receiving antenna, adjust the frequency, and adjust the volume to make it in the best state.

(3) The antenna of the wireless microphone should hang down naturally, exposing outside the clothing.

(4) Prevent the battery polarity from being reversed. After use, remove the battery in time.

(如驻极体电容麦克风、无线麦克风)是用电池供电的。 Some microphones (such as electret condenser microphones, wireless microphones) are battery powered. If the voltage drops, the sensitivity will decrease and the distortion will increase. Therefore, when the sound becomes worse, check the battery voltage, turn off the power switch when the microphone is not in use, and remove the battery when not in use for a long time.

teanma小编为大家介绍的会议麦克风的基本使用。 The above is the basic use of the conference microphone introduced by Teanma.

 

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