Wireless microphone's history is not long, also a decade or two of history, but the development is extremely rapid. Eighties, we seldom see. Products nothing more than Newman, Siya and other international few microphone manufacturers; in the application, only to see a large concert abroad. Over time, brands such as Audio-Technica, Sennheiser, Sony and EV gradually entered the domestic high-end sound system.
With the development of electronic technology and the growing use of wireless microphone technology, market, applications have made great strides, the price is gradually approachable, all kinds of brands, various types of wireless microphone after another. Especially in recent years, domestic wireless microphone emergently in the middle and low-end market occupy half of the country. Enping Guangdong even appeared in the production of wireless microphone (microphone) distribution center.
Relatively speaking, wireless microphones are more expensive than wired microphones, which are more technically complicated and more delicate in use. Therefore, how to select and use a wireless microphone for this article is introduced.
Wireless microphone technology development
The wireless microphone has gone through about three stages from the very first simpler wireless FM transmitter and wireless FM receiver to the current dedicated PLL (frequency-locked loop) technology.
BY-WM5 Wireless Microphone
BOYA BY-WM5 wireless microphone is for use with DSLR cameras, camcorders. The 2.4 GHz GFSK system result in strong anti-interference, good security and stability.
1. Simple FM transmitter and receiver
At that time, in order to get rid of the fetters of the microphone cable, people came up with the principle of transmitting and receiving similar to FM radio. Through the microphone's transduction principle and audio → modulation → amplification → transmitting process, and then through the FM radio or special receiver ) Receive, playback. Can be imagined, its sound quality, stability, anti-interference ability, etc. can not meet the actual needs.
2. Quartz oscillation FM transmit and receive
Due to the RC or LC oscillation generated by the electronic circuit, the stability of the oscillation frequency is greatly affected by the environment and its frequency can not be very high. Generally, the oscillation frequency is generally lower than two or three hundred megahertz. In such a frequency band, Very susceptible to interference from other signals, this time there has been the use of quartz oscillator transmitting and receiving circuits. As we all know, quartz crystal oscillation frequency is very stable, composed of wireless microphone transmitter and receiver, work more stable, and its operating frequency can be V (30MHZ-250MHZ), U (200 -1000MHZ), the external interference signal is not serious, to the use of wireless microphone has brought better results.