Why do lavalier and headset microphones have advantages over handheld microphones?
The emergence of wireless microphones, Contact:Song Haizhu Contact:Make the user of the microphone (singer, musician, actor or speaker) free from the constraints of the wire, thus greatly expanding its activity space. Early wireless microphone is modelled on the traditional wired microphone shape and process, almost all handheld (handheld mic.) products, although in the playback of sound quality and play the user's subjective initiative (such as the use of near, speaking effect), handheld microphone has certain advantages, but because of the occupation of the actor (or speaker) of a hand, coupled with the user's face obscured, so that people always feel a little bit of the image. Affect the image, so people always feel a little inconvenience and beauty.
Subsequently began to appear lavalier microphone, especially in China in recent years the popular headset microphone, to a large extent to overcome these shortcomings thus can be gradually developed by the community widely welcomed, has become a microphone family in the emerging "new favorite"!
1、Clip-on wireless microphone
Clip-on wireless microphones include lavalier microphones that pick up the human voice and clip-on microphones for musical instruments (clip-on mic.), the shape of which are shown in Figure 1, Figure 2.
In fact, however, many manufacturers produce certain types of clip-on microphones for both lapel clips and instrument clips. Clip-on microphones come in a variety of similar varieties and names, such as button-on, neck-hanging, pin-on, and wearable.
The transmitter of a lavalier wireless microphone hangs from the actor's waist and is connected to the microphone's pole head by a cable. Usually omnidirectional poles are used and have specially designed anti-vibration devices to reduce the noise generated by the microphone and microphone cable rubbing against the user's clothes.
In order to further reduce this harmful noise, there are some tips for microphone use. For example, try to avoid friction between the microphone head and clothing when wearing the microphone, use microphone clips to keep the cable relatively fixed, and keep the connector part of the cable and microphone head from being affected by the stretching of the cable.
Since the high-frequency component of the speech signal is radiated towards the front of the mouth, microphone clips in front of the chest pickup will have a loss of high-frequency signal, so the frequency response of the lavalier microphone is intentionally designed to have a boost of usually 8-10 dB at 2-7 kHz, with a boost peak at 5 kHz, and this boost also compensates to some extent for the high-frequency loss caused by clothing shading.
In addition, there is frequency boost at 700 Hz for men and 800 Hz for women due to resonance in the chest cavity, and some lavalier microphones use acoustic or electrical methods to equalize this boost.
The birth of the clip-on (later described as head-to-head) wireless microphone took stage sound amplification and conference sound amplification technology to a new level. It completely freed up the user's hands and greatly expanded the user's range of motion.
The speaker is no longer tied to the microphone lead, nor does he or she have to hold the microphone and take up a hand and cover the face (the lavalier wireless microphone is easy to hide).
You can also leave the podium when needed, fully use vivid body language, operate the presentation equipment, point to the wall chart with a whip, write on the blackboard with chalk or write on the whiteboard with a special pen, switch the AV system with a hand click on the touch screen, and even walk to any location in the classroom or conference hall to interact with the audience.
Singers and musicians can play among themselves on stage while dancing and singing, or they can directly pull a violin, play guitar or even play the saxophone into the audience for more intimate interactive communication. As for drama, opera, operetta, musicals, all achieved unprecedented aural and visual effects!
The lavalier microphone is mainly used for language enhancement (conference presentations, teaching and training, news broadcasts, drama, comedy and other performances, film and television synchronized sound source), with good results. However, because the microphone position is far from the mouth, the directionality of the microphone can only be omnidirectional, so it is easy to produce feedback whistling, need to pay attention to the regulation of the system. Lavalier wireless microphone is generally not suitable for singing, the effect is not good.
Clip-on instruments using microphone work can usually clip on the trumpet, trombone, tuba and saxophone bell, guitar plucking treatment position information as well as through the fiddle code position, can get a fairly good pickup effect, see Figure 2.
Clip-on microphone for musical instrument
Headset microphone is a rapidly developing variety of wireless microphone in recent years. People can see the development trend of microphone technology from the CCTV Spring Festival Gala for many years. In the early days, handheld wireless microphones were widely used for singing and dancing performances, while stand-up microphones were used for comedy and musical instrument performances.
Later, some language programs, such as skits, gradually adopted clip-on wireless microphones. With the development of technology, as the headset microphone pickup head near the mouth, can be equipped with a heart-shaped or super heart-shaped microphone, pickup effect is getting better and better, and not easy to whistle, especially the shape is increasingly small and chic, coupled with people's aesthetic changes, early thought that hanging a thing by the ear indecent, but now feel that hanging a new trend of headset microphone is "cool ".
Including singing and dancing, singing, language programs and interview programs, including variety shows are also increasingly using headset microphones.
The use of headset microphones is also becoming increasingly popular in a wide range of areas such as training, teaching, tour guiding, exhibition lectures, fitness lead dancing, and live conducting.
Headset microphone pickup head has omnidirectional ** and single pointing ** two kinds, such as Figure 6 (a) and (b). The former is worn as long as the pickup head is adjusted on the left and right sides of the mouth, about a finger's distance from the corners of the mouth, and maintain a vertical direction with the corners of the mouth, you can avoid airburst murmurs, to achieve the clearest acoustics, such as Figure 6 (a).
The latter pickups because of the directionality, in live singing, than the omnidirectional microphone has a richer bass and wider dynamic range, better sound quality, but the pickups hanging way is relatively more critical, in addition to sensitivity will change due to the distance from the mouth, the pickups near the effect of speaking and airburst murmur response is also more sensitive.
Theoretically, the pickup head is located directly in front of the mouth of the best sound quality, but our social location on the singer's "image" seems to have a slightly different impact, and easy to develop by the interference of air bursts, so companies usually use the recommended students still need to avoid the front of the mouth to the middle of the chin position will be more secure.
Experience has shown that the front of the microphone pickup head and the corner of the mouth to maintain a distance of about a finger, and the corner of the mouth to maintain a horizontal direction of about 45 ° is more ideal for hanging position, such as Figure 6 (b), you can avoid the destruction of the sound of air bursts, but also to show the best sensitivity and sound quality.
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