Wireless microphone is ultra-high frequency (VHF) or UHF (UHF) carrier in the short distance range of the wireless microphone output of the electrical signal through the transmitter in the form of electromagnetic waves to the receiver, the receiver and then by the solution Adjust the high-frequency signal to restore the sound signal. Wireless microphone microphone head a lot, there are moving sound type sound head, there are electret head, or capacitive sound head. Wireless microphone style is also a lot, mainly hand-held, headset and lapel-style.

Let's take a look at the benefits of wireless microphones:

The wireless microphone eliminates the need for transmission cables, making the pickup simple and convenient. Taobao for mobile sound source, which ensures the sound source and the microphone from the distance consistency. In the same period when the film and television recording, you can exclude the microphone or its shadow on the screen image interference, improve the visual effects.

Although there are so many advantages of wireless microphone, but it also has some shortcomings, due to the more transmission equipment and receiving equipment, an increase in the cost of the microphone. Wireless microphone is radio frequency transmission, anti-interference ability, while other electronic equipment also interfere. In addition to restore through the modulation, transmission, reception, demodulation and other more complex process. Sound quality will also be affected.

Wireless Microphone Accessories
Wireless microphone should be based on the overall requirements of the system and the application to choose, the general meeting place, the choice of single-oriented heart-shaped or super-heart-shaped microphone, should be placed in the sound source 20-30CM or so, if the distance is too close, will produce Near the effect of the sound caused by the low frequency too much, affecting the clarity of the language; too far away, resulting in sound pressure is not enough sound, if by increasing the pre-amplification to improve sound pressure, sound waves will cause whistle. With respect to the angle between the sound source and the microphone, the output of the microphone is the best when the sound source is at 0 degrees with the center axis of the microphone. In order to ensure better sound effects, the sound source and the center axis of the microphone should be kept within 30 degrees.

In the high-quality sound reinforcement theater or recording room, you can choose high-quality moving coil microphone, you can also choose frequency wide, smooth frequency curve smooth, low degree of distortion of the condenser microphone, in order to obtain high-fidelity sound recording Replay. If you pick up the sound of a large band, you can choose AB system, MS system, XY stereo microphone sound collection. Put the microphone on the stage mouth, from the band 5-7m position, the microphone axis pointing to the band.

In the theater performances can be selected when the lapel-type wireless microphone, in the performance of crosstalk can be used when the pole microphone; in the opera can be used when the single-directional microphone microphone microphone, placed in the stage of the left, middle and right Position, it can eliminate the impact of the stage surface reflection, but also can effectively suppress the surrounding audience noise, will not affect the audience's attention.

Solo actor pick up, if it is popular songs, folk songs can be used heart-shaped and super-heart-shaped handheld wireless microphone, from the mouth between 1-250px, can pick up the details of the feelings of the song, in order to prevent the sound of teeth, Wireless microphone side, in order to prevent the nozzle sound, such as the initial consonant "pb" when the distance away from the appropriate wireless microphone can be placed in the mouth 20-1000px out.

In the stadium broadcast all kinds of games on the scene, the general use of single-pointing microphone in the rifle, it has strong directivity, can pick up the sound of long distance, single-tone range of small, Only different square, different angles of the microphone. Placed in the periphery of the game, and point to the venue.

Some of the more important meeting venues, the general use of single-oriented gooseneck microphone. Because it has a strong directivity, can be placed in the mouth from 20-750px mouth, mouth and microphone axis angle of not more than 30 degrees, this can increase the clarity of the language. You can also use the interface microphone, its pickup clarity is also very good, and difficult to see.

Drums sound, because the sound pressure is large, the general use of heart-shaped dynamic microphone, and requires the use of less sensitive heart-shaped dynamic microphone, because the low sensitivity of the microphone, can effectively suppress the distortion caused by loud pressure, but also Inhibit the introduction of environmental noise. In the bass drum pickup, the bass drum pickup, the microphone placed in the bass drum inside, with a sponge and other sound-absorbing material tight; and leave the sound source 500px or so, and the sound source into 15 degrees to avoid pickup quality.

The placement of the microphone should not have a large plane reflection, such as walls, mirrors, granite, etc., in order to avoid a strong reflection of the sound caused by the phase interference and damage the natural degree of sound. So the microphone should be placed in the direction of radiation, so as not to cause whistle. If you use more than one microphone, to maintain the consistency of the phase, the mixer often use more than one microphone, if the opposite phase of the microphone exists, the reverse microphone and positive phase microphone input mixer, mixed signal Will offset each other, make the sound lighter and distorted. Especially when the microphone is mixed with different signals, it is used to cause the microphone phase inconsistency. At this time you can use the next method to identify: so that two microphones at the same time to accept a sound source, when the sound source to improve the volume, the sound also will increase, indicating that the two microphone phase consistent, when the sound source volume increased , The sound is not significantly improved, and there is distortion, indicating that the two microphone phase reversed, should use the mixer on the phase switch to be corrected.

The microphone should be used in the outdoor wind shield, to avoid the wind blowing the metal network whistling sound and effectively prevent dust into the microphone and cause signal distortion, pay attention to shock, because the microphone structure is more sophisticated. Strong vibration caused by microphone overload, but also likely to cause damage to the microphone structure, especially the condenser microphone vibration is easy due to vibration caused by breakdown, but also should pay attention to moisture, such as long-term moisture damp, dynamic magnetic circuit is easy to rust, Resulting in moving coil and magnetic circuit collide, will also cause the film moldy and affect the dynamic circle and magnetic circuit will also affect the normal operation of the microphone.

When using the microphone, pay attention to whether the battery is sufficient, the voltage is too low will cause the noise increases, the sound details are serious, it is best to check each time before use. Attention to avoid the blind spot, or will cause the frequency or signal in the middle. The same receiver can not use too many wireless microphones at the same time, to avoid the transmission frequency similar to each other interference. Between the wireless microphone and the receiver to avoid the metal structure of the obstacles, to avoid the signal is absorbed by obstacles. Professional microphone should also pay attention to professional balance and unbalanced connection, balanced connection can effectively reduce the interference caused by the coupling, unbalanced connection will be too long because of the connection, the distribution of capacitance is too large, causing high-frequency signal loss.