接地回路
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两个接地设备之间的不需要的电流路径,在音频系统中造成可听到的嗡嗡声或嗡鸣声。
当两个设备(如笔记本电脑和放大器)通过不同插座接地时,微小的电压差会产生50/60 Hz的嗡嗡声。解决方案包括接地回路隔离器、光纤线缆(TOSLINK)、平衡连接(XLR)或从同一插座为两个设备供电。