阻抗
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电路中对交流电的阻抗，以欧姆为单位测量，对音频和视频信号质量至关重要。
线缆和设备之间的阻抗不匹配会导致信号反射和质量损失。音频耳机通常为16-600欧姆；同轴视频线缆为75欧姆；以太网为100欧姆。始终将线缆阻抗与设备规格匹配。