When U-band wireless microphones are emerging, everyone is familiar with diversity reception technology. Now, whenever you search for wireless microphones on the Internet, you will often see true diversity receiving wireless microphones instead of the previous diversity receiving wireless microphones. And in the communication technology, we only see the theory of diversity reception. Then, how does this true diversity reception come from?
Below, let's explore this topic together.
First, let's take a brief look at the working principle of wireless microphones. Let's use a hand-held wireless microphone as an example. The microphone core in the handheld microphone converts the picked-up sound signal into an electrical signal. After amplification, the electrical signal passes through the transmitter antenna. The radio wave is transmitted out and then received by the antenna of the wireless microphone receiver of the same frequency at a distance, and the electrical signal is transmitted to other audio devices. Therefore, the integrity of electrical signal reception is very important.
When radio waves are propagating, they will encounter a lot of interference, such as being blocked, absorbed, and reflected. When wireless microphones are used in a complicated environment, frequency breaks often occur, which affects the quality of use. For this reason, the great gods The diversity receiving technology is studied. Two high-frequency receiving chips in the receiver receive the same transmitting signal at the same time, and will automatically switch to the chip with stronger signal to receive, which greatly eliminates the dead frequency of the broken frequency. Representatives include the international brand Sennheiser's E-series products, two high-frequency receiver chips in the receiver are equipped with a high-frequency antenna, and later it became the leader in the microphone.
After that, major manufacturers in China have successively researched the diversity receiving technology, and even more directly used these technologies in one to two wireless microphones (ie, one receiver with two handheld microphones), and two high-frequency receivers in the receiver. The chip receives the electrical signals of the two microphones at the same time, and the merchants also say that they are diversity receiving technologies for propaganda. However, in actual use, the frequency break phenomenon often occurs, resulting in incomplete sound. In order to distinguish the two, the two high-frequency receiving chips receive two microphones called antenna diversity reception, and the two high-frequency receiving chips receive one. The microphone is called true diversity reception.
In the era of continuous development of technology, large manufacturers soon developed a one-two wireless microphone for true diversity reception. Each channel in the receiver has two high-frequency receiving chips, which respectively receive the electrical signals of the microphones of each channel, and also adopts the classic true diversity receiving technology. Some manufacturers design the products into two high-frequency receiving chips. One antenna, some manufacturers give each high-frequency receiving chip an antenna, and the indoor dedicated wireless microphone is designed as two antennas. The wireless microphone suitable for indoor and outdoor and other environments is designed as four antennas. The same is true diversity reception technology, but the stability of the four antennas is better than the stability of the two antennas. So you can choose the wireless microphone that suits you according to your needs.
At the same time, we must also pay attention to some bad businesses. Although we have made four antennas, each channel in the circuit has only one high-frequency receiving chip, and two of them are only placed.
I believe that everyone has already learned about the diversity receiving technology and true diversity receiving technology of wireless microphones. If there are any leaks, please correct them.
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