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Analysis of Infrared Wireless Microphone

Author:admin   AddTime:2021-06-05

Infrared wireless microphone is a commonly used equipment in KTV private rooms. It uses infrared light as the carrier of sound signals to achieve a wireless pickup system for transmitting and receiving. The basic principle is similar to that of an ordinary radio frequency system, and the process of modulation and demodulation of the sound signal is also required in the process of wireless transmission and reception. However, the carrier of infrared wireless microphones is infrared light, and its frequency is much higher than that of ordinary wireless systems. The frequency of ordinary wireless microphones is 200-900MHz, which is commonly referred to as radio frequency (the frequency band used by radio stations, television stations, and wireless communications); infrared microphones The frequency is above 3G, the frequency environment is clean, and few devices radiate interference waves. People often have the following questions about infrared wireless microphones.

①. Is the use of more mirrors in the KTV private room more beneficial to the acceptance of infrared wireless microphones?
People often think that the more mirrors in KTV rooms are used, the better the reception of infrared microphones. In fact, this is a wrong understanding. Facts have proved that the more mirrors used in the KTV private room, the worse the infrared microphone will receive. Although the energy loss of the mirror in the light reflection process is very small, the mirror will reflect the light signal in one direction, which objectively hinders the formation of a dense optical network in a relatively sealed space, leading to the formation of blind spots in the space. For places with large-area mirror interiors, it can be overcome by increasing the number of receiving heads to achieve satisfactory receiving results.

②. Can the number of spare microphones be reduced by using infrared microphones?
Due to the superiority and versatility of infrared microphones, any set of microphones can be used in any relatively independent space without considering the problem of frequency interference; at the same time, all hair generators are also universal, any pair of A and B channels The transmitter can work with any receiving host to form a system without considering the frequency correspondence between transmitting and receiving, so the number of spare microphones can be greatly reduced, and the occurrence of low room opening rates due to microphone failure can be reduced.

③ Will the infrared microphones interfere with each other?
Infrared rays are transmitted in a straight line, so there will be no interference between infrared wireless microphones in each relatively independent space. However, if infrared microphones of the same frequency are placed in the same space, they cannot be used normally due to mutual interference. At present, infrared microphones generally have two independent distinguishing frequencies, namely, A and B channels (there are obvious distinctions at the transmitting end). An infrared receiving host can simultaneously receive signals from a microphone on A and B channels, but it cannot be accepted. Two or more A channels; two or more B channel signals.

④. Will the infrared microphone be interfered by the light of fluorescent lamps, electric lamps and other lighting equipment?

In the design of the infrared microphone, the selected infrared light frequency band has avoided the infrared light frequency band radiated by these lighting devices, so it will not be interfered.

⑤. Infrared microphones are used in two adjacent spaces. When the door is opened, will they interfere with each other?
Under normal circumstances, there will be no interference, but there is a theoretical possibility of interference. Although infrared light may enter the adjacent space through the open door, the energy of the light entering through the door is much weaker than the infrared microphone in the space, at least an order of magnitude difference. The receiving host always responds to the same frequency signal. It accepts high-energy (high-intensity) signals, so the infrared rays entering through the door are almost impossible to be received. At the same time, adjusting the position of the receiving head can also reduce the possibility of interference caused by the cross-talk of the door-to-door signals.

⑥. Since the infrared microphone uses infrared light as the carrier wave, will the signal be interrupted due to the movement of people in the space or the movement of the transmitter?
The light has a very strong reflective performance. The light signal sent from the transmitting end does not need to reach the receiving end directly, but as long as the light signal reflected and scattered by the reflecting surface reaches the receiving window, reliable reception can be ensured. At present, infrared microphones adopt multi-point emission and multi-point reception technologies to further ensure the reliability of reception. The infrared signals emitted from the transmitter in all directions in the space will be reflected and scattered by each reflecting surface and will be in a relatively sealed space. A dense, invisible optical network without blind spots is formed inside. At the same time, the receiving window is also expandable. Increasing the number of receiving windows and selecting a suitable installation position can increase the receiving reliability factor and increase the receiving radius. Therefore, the infrared microphone will not be interrupted due to the movement of people in the space or the movement of the transmitter.

⑦. Are there any restrictions on the number of infrared wireless microphones used in entertainment venues?
There is no quantitative limit. Infrared wireless microphones have only two frequency points to distinguish the two microphones used in the same space, that is, the two channels A and B. Since infrared light cannot penetrate walls or opaque partitions, they are completely the same in different spaces. The systems will not interfere with each other. It can be used in unlimited amounts.

⑧. Will the infrared microphone be interfered by the plasma TV?
Plasma TVs can radiate very strong infrared light, which everyone knows. Moreover, plasma TVs of different brands and different display sizes have very different infrared light spectrums after being lit, which is technically impossible to avoid The frequency of infrared light that all plasma TVs may radiate, so it is difficult for infrared microphones to truly resist interference from plasma TVs. At present, a better way is to avoid using it with plasma TVs as much as possible. You can choose LCD, projection, rear projection, ordinary TVs, etc. as display devices; or shield the infrared light radiated by plasma TVs to reduce plasma TVs. Infrared light radiation, the current ideal shielding material is automobile anti-riot film.

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