With the advent of wireless microphones, microphone users (singer, musician, actor or speaker) get rid of the shackles of wires, thereby greatly expanding their space for activity. Early wireless microphones imitated the shape and craftsmanship of traditional wired microphones. Almost all of them were handheld products. Although the handheld microphones had a certain degree of reproducing sound quality and exerting the user's subjective initiative (such as the use of proximity and speaking effects). However, because it occupies a hand of the actor (or speaker) and the user’s face is blocked, it affects the image, making people always feel a little inconvenient and inadequate. The subsequent lavalier microphones, especially the popular head-mounted microphones in recent years, have overcome the above shortcomings to a large extent and have gradually gained wide popularity, becoming the up-and-coming "new favorite" in the microphone family!
1. Clip-on wireless microphone
Clip-on wireless microphones include lavalier microphones for picking up human voices and clip-on microphones for musical instruments.
But in fact, some models of clip-on microphones from many manufacturers are used both for lavalier clips and instrument clips. There are many similar varieties and names of clip-on microphones, such as button type, neck hanging type, pin type, wearable type and so on.
The transmitter of the clip-on wireless microphone is hung on the waist of the actor, and is connected to the microphone pole by a cable. Usually use omnidirectional pole head, and has a specially designed anti-vibration device to reduce the noise caused by the friction between the microphone and the microphone cable and the user's clothes. In order to further reduce this harmful noise, there are also some skills when using the microphone. For example, when wearing the microphone, try to avoid the friction between the microphone head and clothes, use the microphone clip to fix the cable relatively, and make the joint part of the cable and the microphone head not be affected by the cable stretching.
Since the high-frequency component of the voice signal is radiated toward the front of the mouth, the microphone clipped in front of the chest will cause high-frequency signal loss. Therefore, the frequency response of the lavalier microphone is deliberately designed at 2-7 kHz, usually 8-10 dB Boost, the boost peak point is at 5 kHz. This boost can also compensate to a certain extent for the high-frequency loss caused by clothing concealment. In addition, due to the resonance of the chest cavity, there will be a frequency increase at 700 Hz for men and 800 Hz for women. Some lavalier microphones use acoustic or electrical methods to equalize this increase.