音频、视频和多媒体系统.多声道音频的一般信道分配

[中文适用范围]： 本文件规定了多声道音频格式的通用声道分配和元数据。本文件通过其声道映射和标签内容，为源设备、数字音频接口和接收设备提供了统一的声道分配使用方法。通用声道分配不包括每个扬声器确切位置的规范。元数据包含每个扬声器的确切位置；然而，由于扬声器位置在不同的环绕声格式中各不相同，元数据的位置信息并未标准化。本标准针对消费者应用，但不适用于剧场环境。规定了多达65个扬声器位置标签和15个显示扬声器标签，可用于所有当前的多声道音频格式。声道分配概念以房间和听众为中心。通用声道分配规定了从听众视角看到的扬声器位置。 [外文原描述]： IEC 62574:2020 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 62574:2020 specifies the general channel assignment and the metadata for multichannel audio format. This document, with its channel mapping and labelling content, provides the unified usage of channel assignments for source devices, digital audio interfaces and sink devices. The general channel assignment excludes the specification of the exact position of each loudspeaker. The metadata has the exact position of each loudspeaker; however, since the position of the loudspeaker is different in various surround sound formats, the position information of the metadata is not standardized. It is aimed at consumer applications; it is not targeted at theatrical environments. Up to 65 labels for loudspeaker positions and 15 labels for loudspeakers on the display are specified, which can be used for all current multichannel audio formats. The channel assignment concept is room centric and listener centric. This general channel assignment specifies the position of the loudspeaker as seen from the listener. IEC 62574:2020 cancels and replaces the first edition published in 2011. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) model of channel assignment spaces is changed; b) definition of channel maps and labels is changed; c) metadata is newly specified; d) channel maps and labels from the first edition are included in Annex A.