多媒体系统. 实现互操作性用模拟接口的推荐特性指南

[中文适用范围]： 本文件提供了关于多媒体模拟接口特性的当前实践指南，以实现来自不同制造商的设备之间的互操作性。它不是性能标准。不涉及用于车辆设备的接口建议，也不涉及用于广播及类似设备的模拟视频接口。参考 IEC 60958 获取数字信号互连的指南。 [外文原描述]： IEC 61938:2018 gives guidance on current practice for the characteristics of multimedia analogue interfaces to achieve interoperability between equipment from different manufacturers. It is not a performance standard. Recommendations for interfaces for equipment used in vehicles, and for analogue video interfaces for broadcast and similar equipment, are not given. Refer to IEC 60958 for the interconnection of digital signals. This third edition cancels and replaces the second edition published in 2013. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) electric tolerance is standardized; b) recommended value of output source impedance is adjusted; c) value of 6 Ohms is additionally recommended to impedance-defined loudspeaker systems; d) values in each table are chosen with respect to the state of the art and representative of best practice in industry.