本标准定义了两种方法之一，用于映射与编码音频相关的串行音频元数据流 音频比特流进入标准清晰度或高清的10位垂直辅助（VANC）数据空间 符合SMPTE 291M的数字分量电视信号。这个VANC映射传递音频 元数据元素，并携带有关嵌入音频的位置的信息 元数据是关联的。相关标准2020-1定义了分配给承载该数据的VANC数据包的DID和SDID值 元数据、数据包的位置、元数据的基本结构以及 异步串行数据传输，用于将元数据从设备传送到设备（如果没有 嵌入视频信号中）。注:相关标准2020-3定义了将元数据映射到辅助数据包的替代方法。

This standard defines one of two methods for mapping the serial audio metadata stream related to encoded audio bitstreams into the 10-bit vertical ancillary (VANC) data space of a standard definition or high definition digital component television signal in accordance with SMPTE 291M. This VANC mapping conveys the audio metadata elements and carries information about the location of the embedded audio with which the metadata is associated.An associated standard 2020-1 defines the DID and SDID values assigned to the VANC packets carrying this metadata, the location where packets are to be located, the basic structure of the metadata, and the asynchronous serial data transport which is used to convey the metadata from device to device (when not embedded in a video signal).Note: An associated standard 2020-3 defines an alternate method of mapping the metadata into ancillary data packets.