多媒体系统.实现互操作性的模拟接口推荐特性指南（GMT

[中文适用范围]： 本文件为多媒体模拟接口的特性提供了当前实践的指导，以实现不同制造商设备之间的互操作性。它不是性能标准。 未给出车辆用设备接口以及广播和类似设备模拟视频接口的建议。 数字信号的互连请参阅IEC 60958。 图1以图表形式显示了音频和视频源及目的地的可能接口。 [外文原描述]： IEC 61938:2018 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. 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.