, known as microphones, are energy-converting devices that convert sound signals into electrical signals and are translated by Microphone. Also known as microphones, microsonics. In the twentieth century, microphones evolved from inductive and capacitive conversion through resistance conversion to inductive and capacitive conversion, and a number of new microphone technologies were developed, including microphones such as aluminum belts and dynamic rings, as well as capacitive microphones and polar microphones, which are currently widely used.
Microphone classification according to the principle of acoustic conversion is divided into: electric (dynamic ring, aluminum belt), capacitive microphone (DC polarization), ballast (crystal, ceramic), as well as electromagnetic, carbon, semiconductor, etc.
According to the sound field force is divided into: pressure type, pressure differential type, combination type, line column type and so on.
According to the transmission of electrical signals are divided into: wired, wireless.
According to the use of: measuring microphones, vocal microphones, musical instrument microphones, recording microphones and so on.
According to the direction is divided into: heart type, sharp heart type, super heart type, two-way (8-character type), no pointing (all-way type).
Polar-based sound transmitters are small in size and low cost, and are widely used in telephones, mobile phones and other equipment.
Silicon micromicresses are based on CMOSMEMS technology and are smaller. Consistency will be more than 4 times better than polar capacitor microphones, so MEMS microphones are ideal for cost-effective microphone array applications where better-matched microphones improve sound wave formation and reduce noise. Laser sound transmitters are used in eavesdropping.
, is composed of several pocket transmitters (can be packed in a pocket, output power of about 0.01W) and a centralized receiver, each pocket transmitter has a different frequency of work, centralized receiver can simultaneously receive the pocket transmitter issued by the different frequencies of the voice signal. It adapts to occasions such as stage podiums.
The categories of wireless microphones can be distinguished into many different types by different definitions. By rate, it can be divided into the following three categories:
a. FM wireless microphone: Commonly known as FM refers to the FM 88-108MHz international FM broadcast band. Early consumer wireless microphone is the use of FM radio to receive, the system is simple, low cost, but because of the use of the effect, can not meet the requirements of professional quality, the 21st century can only become children or students toys.
b. VHF wireless microphone: also divided into low-frequency and high-frequency band two types, the former using VHF50MHz frequency band, because of the low frequency, the use of antenna length is too long, but also vulnerable to a variety of electrical clutter interference, so this type of product, in the 21st century has been replaced by high-frequency band and gradually disappeared from the market. The latter uses the VHF200MHz frequency band, because of the higher frequency, the use of short antenna, can even be designed as a hidden antenna, convenient, beautiful, by the electrical clutter interference and greatly reduced, circuit design is extremely mature, parts popular and low price, so it has become a popular machine on the market today.
c.UHF wireless microphone: A wireless microphone with a frequency of 300-3000M. It is the mainstream of microphone application in the 21st century. Because the interference of the V-segment talkies and so on is avoided, the stability is greatly improved.
tage: condenser microphone USB microphone