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Basic information about using the microphone

Author:admin   AddTime:2021-03-24

Perhaps many people will think that pick up the microphone, can speak on it, in fact, want to let the microphone make a high-quality sound, its use is also exquisite, now with the small editor to understand the basic use of the microphone.

The choice of microphone, should be based on the use of the occasion and sound quality requirements, combined with the characteristics of a variety of microphones, comprehensive consideration of choice. For example, high-quality recording and broadcasting, the main requirements of good sound quality, should choose an electric microphone, aluminum tape microphone or advanced dynamic microphone; When making a general loudspeaker, choose the ordinary dynamic ring type can be; When the speaker's position moves or speaks from time to time with the loudspeaker distance, such as karaoke singing, should choose a one-directional, less sensitive voice transmitter, to reduce noise interference. The use of capacitive microphones requires phantom power supply, generally in the technical parameters of the microphone has a description of the power supply voltage, to choose the appropriate voltage phantom power supply, the mixer is generally equipped with 48V phantom power supply.

The choice of microphone, should be based on the use of the occasion and sound quality requirements, combined with the characteristics of a variety of microphones, comprehensive consideration of choice. For example, high-quality recording and broadcasting, the main requirements of good sound quality, should choose an electric microphone, aluminum tape microphone or advanced dynamic microphone, such as karaoke singing, should choose a one-directional, less sensitive microphone.

In use, it should also be noted that:

1, impedance matching

When using a microphone, the microphone's output impedance is the same as the amplifier's input impedance, which is the best match and can affect transmission if the mismatch ratio is above 3:1. For example, when connecting a 50-o microphone to an input impedance 150-o amplifier, although the output can be increased by nearly 7Db, the high- and low-frequency sound is significantly lost.

2, the cable

The output voltage of the microphone is very low, in order to protect against loss and interference, the cable must be as short as possible, high-quality microphone should choose the two-core stranded metal shield, the general microphone can use a single-core metal shield. The length of the high-impedance microphone transmission line should not exceed 5 meters, otherwise the treble will be significantly lost. The low-resistance microphone can be extended to 30m-50m.

3, working distance and close talk effect

In general, the working distance between the microphone and the mouth is 750px-1000px, if the distance is too far, the echo increases and the noise increases relatively. Working too close, will be too strong signal distortion, low frequency sound too heavy and affect the clarity of the language. This is because there is a "proximity effect" in directional microphones, where low-frequency sound is significantly improved when broadcast at close range. Sometimes, however, singers deliberately use the term "near-speaking?" Make the singing effect more beautiful and beautiful.

4, the angle between the sound source and the microphone

Each microphone has its effective angle, the general sound source should be quasi-microphone centerline, the greater the angle between the two, the greater the treble loss. Sometimes when using the microphone, there is a "loud" sound, when the microphone deflects some angles, you can reduce some.

5, microphone position and height

When you amplification, the microphone should not be placed or aligned with the speaker first, as this can cause a whistling.

The height of the microphone should be based on the height of the source, if a person speaks or several people sing, the height of the microphone should be consistent with the speaker's mouth; When the number of people, the microphone should choose the average height of placement, and appropriate deployment of the singer and accompaniment and the position of various instruments in the team, do not make the sound too loud, light too light, and make all the sound within the effective angle of the microphone. If there is a lead singer or lead, place a dedicated microphone if necessary.

When several microphones are required to be used at the same time, you can take a joint approach, but you must be aware of the phase problems of several microphones. When the phases are consistent, they can be in union with each other, otherwise they will interfere with each other, reducing the output and distorting them. Different models and different impedance microphones should not be used in union because the high-impedance microphone is "short-circuited" and the output voltage is reduced to a very low level. In general, microphones are used directly in a union and are not as effective as a single microphone.

If you use several microphones for one person to use at the same time, rather than separating several places for different purposes, it is appropriate to choose the same model. Otherwise, the tone of the speech changes due to the speaker's movement or angle change.

The microphone should be used to prevent tapping or falling. It is not advisable to test the microphone with blowing or tapping, as this is prone to damage to the microphone.

When the microphone is used outdoors or recording voice, the wind shield should be used to avoid recording the wind's "whisper" sound. The wind shield also prevents dust from staining the microphone.

When using a wireless microphone, be aware that:

(1) Choose the location of the receiver to avoid the "dead spot".

(2) When receiving, adjust the angle of the receiving antenna, adjust the frequency, adjust the volume so that it is in the best state.

(3) The antenna of the wireless microphone should naturally sagging to reveal the outer part of the garment.

(4) To prevent the battery polarity, use, the battery will be removed in time.

Some microphones, such as polar capacitive microphones and wireless microphones, are battery-powered. If the voltage drops, the sensitivity decreases and the distortion increases. Therefore, when the sound is worse, you should check the battery voltage, when the microphone is not in use should turn off the power switch, long time when not using the battery should be removed.
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