Conference microphone manufacturers: wireless microphone performance


The performance of wireless microphones is often affected by various factors, such as interference from the frequency of surrounding devices, improper operation by users, and so on. Next, the conference microphone manufacturers talk to you in detail.

1. The compatibility of the whole system is not enough.

Conference microphone manufacturers said that all frequencies have different degrees of compatibility. If you know the system well, you can boldly adopt more systems, but the key is how to weigh the compatibility of the entire system. Most of the frequency compatible software has an important assumption in the design, that is, all receivers are always on or off (even if some transmitters are occasionally off), so as to ensure that all receivers will not pick up intermodulation signals that may produce noise. Therefore, the design of this software needs to leave enough space for the intermodulation signal and the wireless microphone. If you assume that the operator of the sound system should play a more active role in the activity, then the system needs to be more widely compatible.

The conference microphone manufacturer stated that in this case, it is assumed that the operator will mute all receiving machines and all transmitting machines will remain unchanged during the performance. The distance between the transmitter and the receiving antenna is similar. These ideas are perfectly feasible in Broadway theater performances, but in school auditoriums, the system is operated by untrained personnel, so it is impossible to achieve the same expected performance effect. When the transmitter is close to the receiving antenna, or when a high-power transmitter is operating, the interference will be more serious. This is why it is much more difficult to get 40 wireless systems to work at the same time in a movie theater than in a school (many transmitting and receiving machines are very close). In a school, there is a system in every classroom, and the transmitting machine is completely dubious, but each is close to its own receiving machine.

Solution: To achieve a balance between a large number of system devices and high performance, you need to ensure that the level of compatibility between frequencies is appropriate for the system to be used. Keep a distance of at least 10 feet between the transmitter and the receiving antenna. If the RF output power of the transmitter is adjustable, a lower transmit power is used to cover the expected distance between the transmitter and the receiver.

The system itself is not compatible.

Conference microphone manufacturers said that when using wireless microphones, there is always interference between the system itself. Although each system's own frequency or spacing is a few megahertz, intermodulation distortion (IMD) still causes mutual interference between microphones. If there is not enough MHz separation between the intermodulation signal and the operating frequency of the device, it is difficult for the receiver to receive the transmitter signal. Typical phenomena are crosstalk between systems, frequent signal loss or excessive noise and distortion. The small spacing between frequencies depends on the design of the system receiver, and an entry-level receiver may require a 1MHz spacing from an adjacent near-term system. More expensive receivers typically have a narrower adjustment window, so the intermodulation frequency spacing between each system is smaller. Solution: To avoid intermodulation distortion, select a compatible frequency for the calculation. This requires extensive knowledge of transmitter and receiver design, and wireless system manufacturers have calculated these frequencies. For example, when only 8 wireless microphones are used together, thousands of calculations are required to ensure compatibility between the microphones. Therefore, most manufacturers publish lists of compatible frequencies for their systems. In addition, in some cases, software can be used to help users identify compatible frequencies.