The wireless microphone uses the ultra-high frequency (VHF) or ultra-high frequency (UHF) carrier to modulate the electrical signal output by the wireless microphone at close range. After modulation, it is transmitted to the receiver in the form of electromagnetic waves through the transmitter, and then the high frequency is demodulated. The signal reverts to a sound signal. There are many types of wireless phone microphone heads, such as moving coil type microphone heads, electret microphone heads, and condenser microphone heads. There are also many styles of wireless phones, mainly handheld, head-mounted, and collar clips.

The benefits of wireless phones

Cordless phones eliminate the need for transmission cables, so reception is easier to listen to. To ensure the consistency of distance, Taobao is specially designed for moving sound sources. When the movie is recorded in sync with the TV, it can eliminate the interference of the microphone or its shadow on the image and improve the visual effect.

Although wireless microphones have many advantages, there are also some disadvantages, because there are many transmitting and receiving devices, so the cost of the microphone is higher. Wireless phones belong to radio frequency transmission, which has poor anti-interference ability and also interferes with other electronic devices. Then restore the more complex process through modulation, transmission, reception, demodulation, etc. Sound quality also has some impact.

Optional wireless microphone based on system requirements and usage

In general meeting places, unidirectional cardioid or supercardioid microphones should be placed at about 20-30 cm from the sound source. If the distance is too close, a near-talk effect will occur, resulting in too many low-frequency sounds and affecting the intelligibility of the language; If the distance is too far, the sound pressure of sound reinforcement will be insufficient, the low frequency of sound quality will be too large, resulting in insufficient sound pressure of sound reinforcement, and the low frequency of sound quality will be too much, resulting in poor sound reinforcement effect; The sound pressure is too large, so the sound reinforcement effect is not good. As far as the sound source and microphone angle are concerned, when the central axis of the sound source is 0 degrees, the microphone output is the best. In order to ensure better sound pickup, the angle between the sound source and the central axis of the microphone should be kept within 30 degrees.

For high-quality sound reinforcement theaters or recording studios, high-quality moving coil microphones can be selected, and condenser microphones with wide frequency response, smooth frequency response curve and low distortion can be selected to reproduce sound sources with high fidelity. If picking up large sound, you can choose AB system, MS system, XY system stereo microphone pickup. Put the receiver on the stage, 5-7 meters away from the band, and the axis of the microphone points to the band.

The clip-type wireless microphone can be selected for theater performances, and the vertical pole microphone can be used when performing cross talk; in opera performance, the interface microphone in the unidirectional microphone can be used, which can be placed on the stage and can be placed on the stage. On the reflector on the stage, you can also choose a vertical pole microphone; when performing on the stage, you can choose the interface microphone in the unidirectional microphone; when performing sketches on the stage, you can choose a wireless microphone with a microphone. You can choose to have a microphone when performing on stage, you can choose to have a microphone when you play a sketch on the stage, you can choose to have a microphone when you play a sketch on the stage, you can choose to have a microphone when you play a sketch on the stage, and you can choose to play a sketch on the stage. with microphone

Monophonic singing, such as popular tunes and folk songs, can use cardioid and supercardioid handheld wireless microphones, between 1-250 px from the mouth, can pick up the emotional details in the sound, in order to prevent sibilance, the wireless microphone can be properly Turn the microphone over, in order to prevent the sound of the spout, if you encounter the initial "p", you can properly open the distance of the wireless microphone to prevent the sibilance, and place it at 20-1000 px.

When rebroadcasting various ball games in the stadium, single pair of double guns are usually used. It has strong directivity and can receive long-distance sounds. The single pickup range is small. In a ball game, the pickup scene requires multiple different squares and different angles. 's microphone. Placed around the playing field, pointing towards the playing field.

In some places where meetings are more important, unidirectional gooseneck microphones are generally selected. Due to its strong directivity, it can be placed at a distance of 20-750 px from the mouth, and the angle between the mouth and the axis of the microphone does not exceed 30 degrees to increase the clarity of speech. Interface microphones can also be used, and their pickup clarity is also very good, and it is not easy to see.