The infrared wireless microphone is a commonly used device in the KTV room. It is a wireless pickup system that transmits and receives infrared light as a carrier of sound signals. The basic principle is similar to that of an ordinary radio frequency system. In the process of wireless transmission and reception, the process of modulation and demodulation of the sound signal is also required. However, the carrier of the infrared wireless microphone is infrared light, and its frequency is much higher than that of the ordinary wireless system. The frequency of the ordinary wireless microphone is 200-900 MHz, which is commonly referred to as the radio frequency (the frequency band selected by the radio station, the television station, and the wireless communication); the infrared microphone 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 more use of the mirror in the KTV room, the more favorable the acceptance of the infrared wireless microphone?
People often think that the more mirrors used in KTV rooms, the better the acceptance of infrared microphones. In fact, this is a misunderstanding. It turns out that the more mirrors used in KTV rooms, the worse the infrared microphones accept. Although the energy loss of the mirror during the reflection of light is very small, the mirror reflects the light signal in one direction, which objectively hinders the formation of a dense optical network in the relatively sealed space, resulting in the formation of blind spots in the space. For large-area mirrored interiors, it can be overcome by increasing the number of receiving heads to achieve satisfactory reception.
2. Can I reduce the number of spare microphones by using an infrared microphone?
Due to the superiority and versatility of the infrared microphone, any set of microphones can be used in any relatively independent space without regard to frequency interference; all the body is also universal, any pair of A and B channels The transmitter can work with any receiving host system without regard to the frequency correspondence between the transmission acceptance, so the number of spare microphones can be greatly reduced, and the low opening rate due to the microphone failure can be reduced.
3. Will the infrared microphones interfere with each other?
Infrared rays travel in a straight line, so they do not interfere with each other between the infrared wireless microphones in each relatively independent space. However, if the infrared microphones of the same frequency are placed in the same space, they will not work properly 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). One infrared receiving host can simultaneously receive signals from one microphone of A and B channels, but cannot accept Two or more A channels; two or more B channel signals.
4. Will the infrared microphone be disturbed by the light from the lighting equipment such as fluorescent lamps and electric lights?
When the infrared microphone is designed, the infrared frequency band selected has avoided the infrared light band radiated by these illumination devices, so it will not be disturbed.
5. The infrared microphone is used in two adjacent spaces. When the door is opened to the door, will it interfere with each other?
Usually there is no interference, but there is theoretical possibility of interference. Although infrared light may enter the adjacent space through the open door, the light entering through the door is much weaker in energy than the infrared microphone in the space, at least an order of magnitude different, receiving the host's co-frequency signal, always The signal of high energy (high intensity) is accepted, so the infrared rays entering through the door are hardly received. At the same time, adjusting the position of the receiving head can also reduce the possibility of interference between the door-to-door signals.
6. Since the infrared microphone uses infrared light as the carrier wave, will it be disconnected because of the movement of people in the space or the movement of the transmitting end?
The light has a very strong reflective performance, and the optical signal sent from the transmitting end does not need to directly reach the receiving end, and the optical signal reflected and scattered by the reflecting surface reaches the receiving window to ensure reliable reception. At present, infrared microphones adopt multi-point transmission and multi-point receiving technology, which further ensures the reliability of acceptance. The infrared signals emitted from the transmitting end to all directions of the space are reflected by the respective reflecting surfaces and scattered, and will be in a relatively sealed space. Inside it is a dense, invisible, blind spot. At the same time, the receiving window is also expandable. Increasing the number of receiving windows and selecting a suitable mounting position can increase the receiving reliability factor and increase the receiving radius. Therefore, the infrared microphone does not cause a disconnection due to the movement of people in the space or the movement of the transmitting end.
7. Is there any limit to the number of infrared wireless microphones used in entertainment venues?
There are no quantitative restrictions. The infrared wireless microphone has only two frequency points to distinguish the two microphones used in the same space, that is, the two channels A and B. Since the infrared light cannot penetrate the wall or the opaque partition, the same space is different in different spaces. The systems do not interfere with each other. It can be used in unlimited quantities.
8. Will the infrared microphone be disturbed by the plasma TV?
Plasma TVs radiate very strong infrared light, which is well known to all. Moreover, the spectrum of infrared light radiated by different plasma TVs of different display sizes and different display sizes is very different, which is technically impossible to avoid. The frequency of infrared light that all plasma TVs can radiate, so infrared microphones are difficult to achieve true resistance to plasma TV interference. At present, it is better to use it as far as possible with a plasma TV. LCD, projection, rear projection, ordinary TV, etc. can be used as display devices; or infrared light radiated from plasma TVs can be shielded to reduce plasma TV sets. Infrared light radiation, the current ideal shielding material is automotive anti-riot film.
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