交流供电的电子设备，由于整流滤波不净、变压器杂散电磁感应以及共模干扰等所造成的嗡嗡声。
... A whirring noise;a hum.呼呼的声音;哼哼声 alternating current hum交流声 Black hum our;dark comedy黑色星期一 ...
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它以风速飞行，发出了音调优美的声音(交流声？)
It flew with the speed of the wind and gave forth a melodious sound a humming noise?
“这些交流声通常只有一两句，然后，声音就消失了，”他说。
"And the communication sound is usually only one or two or three utterances and then it's gone, " he says.
同时分析了现场扩声中极易出现的交流声、啸叫声产生的原因，并介绍了有关应对的方法。参考文献7。
It also has analyzed the reason why hum and whistle cry are frequently produced and has introduced the method to deal with them. 7 refs.
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