笔记本音频输出端口的电干扰比测试细节分析  

Detail Analysis of Electrical Interference Ratio Testing of Audio Output Port for Laptops

作　　者：刘金龙 阮武 王壮 侯青俊 董良锁 董智芝 王荣锋 Liu Jinlong;Ruan Wu;Wang Zhuang;Hou Qingjun;Dong Liangsuo;Dong Zhizhi;Wang Rongfeng

机构地区：[1]联想(上海)信息技术有限公司 [2]合肥联宝信息技术有限公司 [3]德凯认证服务(苏州)有限公司

出　　处：《安全与电磁兼容》2024年第3期75-80,共6页Safety & EMC

摘　　要：针对具有音频输出功能的多媒体产品,重点探讨了其电干扰比测试要求以及实际测试中易被忽视的关键环节。以笔记本电脑的3.5 mm音频输出端口为例,深入分析了音频信号线、推荐阻抗的确定、音源文件的品质和特性、参考电平的调整方法等对测试结果的影响。研究表明,音源文件对试验结果的影响最明显。文章同时提供了查验音源文件有效性的方法及适用的试验参数,并建议记录选用推荐阻抗的依据,以重现测试结果。该研究对相关厂商进行数据分析和完善测试方法、提高音频输出产品的电磁兼容性能具有一定的参考意义。Focusing on multimedia products with audio output functions,this paper mainly discusses the testing requirements of electrical interference ratio and the key links that are easily neglected in practical testing.Taking the 3.5 mm audio output port of notebook computers as an example,this paper analyzes the impact of audio signal line,determination of recommended impedance,quality and characteristics of audio source files,and adjustment methods of reference level on the test results.The study shows that the audio source file has the most significant impact on the test results.The paper also provides methods to check the validity of audio source files and applicable test parameters,and recommends recording the basis for selecting the recommended impedance to reproduce the test results.This research has certain reference significance for relevant manufacturers to conduct data analysis,improve test methods,and enhance the electromagnetic compatibility of audio output products.

关 键 词：电磁兼容 音频输出 电干扰比 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]