Method for eliminating audio signal interference

By using the balanced method to transmit signals, there is generally no serious audible interference. However, this problem can occur when different power supplies are used at both ends of the signal. This kind of interference should be signaled to the main signal. This situation often occurs in large stadiums and theaters. In the case where the mixer is far away from the OB van, a serious humming sound occurs. Repeatedly checking the audio signal connection such as balance, unbalanced phase change with four-core shielding and the installation of isolation transformers can not be solved.

The reason is that the devices at both ends of the signal are caused by non-identical power supplies. You can measure the potential difference between the power supply grounding points at both ends. If the potential difference is large, then this potential difference is enough to generate strong AC interference in the loop through the shielded line.

The solution is to ground one end of the shield wire so that it still has a shielding effect and the other end is suspended. The potential difference between the two grounding points cannot make a loop in the connection, and the hum is not generated.

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