Wireless microphone is the use of ultra-high frequency (VHF) or ultra-high frequency (UHF) carrier to close modulation of the wireless microphone output electrical signal, after modulation through the transmitter in the form of electromagnetic wave to the receiver, and then demodulated the high-frequency signal back to sound signal. There are many kinds of radio telephone sound transmission head, there are moving coil sound transmission head, electret sound transmission head, capacitor sound transmission and so on. There are also many styles of wireless phones, mainly hand-held, headwear, collar clips.
The benefits of wireless phones
Wireless phones are easier to listen to because they dispense with transmission cables. In order to ensure the consistency of distance, Taobao is specially designed for mobile sound sources. When the movie is recorded simultaneously with the TV, the microphone or its shadow can be eliminated to interfere with the image and improve the visual effect.
Although wireless microphones have many advantages, there are also some disadvantages, because there are many sending devices and receiving devices, so the microphone cost is higher. Wireless telephone belongs to radio frequency transmission, anti-interference ability is poor, while interfering with other electronic equipment. Rereduction through modulation, transmission, reception, demodulation and other more complex processes. Sound quality also has some effect.
Wireless microphones are available depending on system requirements and usage
Usually, in the meeting place, the single-directional heart-shaped or super-heart-shaped microphone should be placed in the sound source about 20-30 CM, if the distance is too close, it will produce a near-speaking effect, so that the sound is too low frequency, affecting the clarity of the language; The distance is too far, resulting in insufficient sound pressure, so that the sound quality is too low frequency, resulting in insufficient sound pressure, so that the sound quality is too low frequency, resulting in poor sound reinforcement effect; The distance is too far, resulting in insufficient sound pressure, so that the sound pressure is too large, so that the sound reinforcement effect is not good. As far as the Angle of sound source and microphone is concerned, the microphone output is best when the central axis of sound source is 0 degrees. In order to ensure a better sound effect, the Angle between the sound source and the microphone center axis should be kept within 30 degrees.
For high quality sound amplification theater or recording room, you can choose a high quality moving coil microphone, or you can choose a capacitive microphone with wide frequency response, smooth frequency response curve and low distortion to achieve high fidelity sound source playback. If you pick up a large stereo, you can choose AB, MS, XY stereo microphone pickup. Place the receiver on the top of the stage, 5-7 meters away from the band, with the axis of the microphone pointing towards the band.
In the theater, you can choose a wireless microphone with a clip, and you can choose a vertical microphone when performing crosstalk. In the opera performance, you can choose the interface microphone in the single directional microphone, placed on the stage on the stage, can be placed on the stage reflector, or you can choose the vertical rod microphone; When performing on stage, you can choose an interface microphone in a single directional microphone, when performing skits on stage, you can choose a wireless microphone with a microphone, when performing on stage, you can choose to use a microphone when playing skits on stage, you can choose to use a microphone when playing skits on stage, you can choose to use a microphone when playing skits on stage, you can choose to use a microphone when playing skits on stage. A microphone is optional when performing a skit on stage
Mono singing, such as pop tunes, folk songs can use heart-shaped and super-heart-shaped handheld wireless microphone, 1-250 px away from the mouth, you can pick up the emotional details in the sound, in order to prevent teeth, you can properly turn the wireless microphone to the side, in order to prevent the spout sound, such as encounter the initial "p", you can properly open the distance of the wireless microphone to prevent teeth. Place at 20-1000 px.
When broadcasting all kinds of ball games in the stadium, the single pair of double guns is usually used, which has strong directivity and can receive distant sounds, and the single pickup range is small. In a ball game, the pickup scene needs multiple microphones with different squares and different angles. Place around the playing field, pointing towards the playing field.
Some meetings are more important places, generally choose a single directional gooseneck microphone. Because of its strong directivity, it can be placed 20-750 px away from the mouth, and the Angle of the mouth and the microphone axis does not exceed 30 degrees to increase the clarity of the language. Interface microphones can also be used, whose pickup clarity is also very good, and not easy to see.