Wireless Microphone Signal Quality and Distance.Conference room audio speakers

　　In the last issue, we talked about one or two points about the signal quality and distance of wireless microphones. Now we send it to discuss that the signal quality of wireless microphones directly affects the transmission distance. The signal quality (S/N) is closely related to the transmit power, the distribution of the spatial field strength, the quality of the receiver, the efficiency of the transceiver antenna and the situation of external interference sources.

　　(3) Transmitting power of wireless microphone

　　Increasing the transmit power can increase the transmission distance of the wireless microphone. However, the transmission power of wireless microphones is limited by the influence of radio waves on the human body, the pressure life of the power supply battery and the interference to adjacent equipment. The transmission power of commercially available products is limited to 2mW to 50mW. Due to the technical reasons of the device, the transmission power of the VHF frequency band is easier to make than the transmission power of the UHF frequency band, and the price is also cheaper.

　　(4) Measures to solve the fluctuation of electromagnetic wave field strength

　　Due to the reflection and absorption of indoor objects, the multi-path propagation of electromagnetic waves and other factors, the field strength of space electromagnetic waves is very complicated. When the distance between the transmitter and the receiving antenna changes frequently, the field strength of this fluctuation also changes. When the receiving antenna is in a weak field strength position, a "mute" point or poor sound quality occurs. To this end, the use of dual-antenna diversity reception technology (Diversity) and AGC automatic gain control technology in the wireless microphone receiver make up for it. The diversity receiving technology is to set two sets of the same receiving antennas and two receiving devices in the receiver, and automatically detect and automatically select the stronger one received signal as the current received signal through a computer chip circuit in the machine. With the cooperation of the control, the problem of "mute" point can be effectively solved.

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