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A Brief Talk on the Causes of Intermittent and Noise in Wireless Microphones

Author:admin   AddTime:2021-05-26

Many bars, dance halls and other entertainment venues have adopted wireless microphones for aesthetics and convenience. The advantages of wireless microphones are obvious, but their shortcomings cannot be ignored. It can be said that it is a common occurrence that wireless microphones have broken sound or noise. Let's analyze with you the reasons and solutions for broken sound and noise in wireless microphones.

① Analysis of the reasons for the interruption and noise of the wireless microphone:

When the antenna of the wireless microphone receives, in addition to the direct wave of the transmitted signal, it also receives the indirect wave reflected by the surrounding environment. If these two waves are in opposite phases, the signal strength will naturally cancel each other out. The signal strength on the antenna line is lower than the receiver's mute operation point, which results in the so-called "receiving blind spot" phenomenon, and the output of the receiver will appear. Short-term staccato or noise, when the signal intensity is closer to the mute action point, the noise becomes louder.



② The receiving principle of "automatic selection" and the method to improve the interruption:
"Automatic signal selection" uses two tuners with exactly the same specifications and antennas connected to different positions to receive the signal from the same wireless microphone transmitter, using a fast comparator and switching circuit to automatically select no "dead spots" The antenna signal output.
Using this dual-antenna and dual-tuner receiving method, when the signal is weak and long-distance reception, the probability of interruption can be improved by more than five times than that of a single antenna. If the signal strength is increased by about three times (10dB), then It can be improved by about forty-five times or more, and if it is used at a general close distance, there will be almost no intermittent sound. The higher the sensitivity of the receiver, in addition to the longer the receiving distance, the fewer the number of interruptions, and the lower the noise that appears when the signal is weak to close to the mute operation point.
③, "Automatic selection" can ensure perfect sound quality of wireless microphone:
Generally, manufacturers of wireless microphones use simple single-antenna "non-automatically selected" receiving circuits to reduce manufacturing costs and sell them at low prices in the market.
"Non-automatically selected" receivers cannot avoid the trouble of interruption and deterioration of noise when the environment is more complicated or the reception is far away! Therefore, in order to ensure the perfect sound quality in places where singing sound effects and professional audio are important, it is necessary to use the "automatic selection" model.
Although the "automatic selection" model is more expensive, it is the only choice to meet the quality requirements of wireless microphones to avoid interruptions and noise.

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