平衡音频
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使用三根导体来消除噪音的信号传输方法，专业音频的标准。
平衡线缆在两根极性相反的导体上传输音频信号，加上一根地线。任何拾取的噪音对两根导体影响相等，在接收端被抵消。XLR和TRS线缆支持平衡音频；RCA不支持。