本标准定义了映射与编码音频相关的串行音频元数据流的两种方法之一 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。此VANC映射旨在供使用 作为通过视频传输以某种方式透明地传输音频元数据元素的一种手段 这使得VANC接收器重构的元数据流与 到达VANC发射机。相关标准SMPTE 2020-1定义了分配给VANC数据包的DID和SDID值 携带此元数据、数据包的位置、元数据的基本结构，以及 异步串行数据传输，用于将元数据从一个设备传送到另一个设备（如果没有） 嵌入视频信号中）。注:相关标准SMPTE 2020-2定义了将元数据映射到辅助数据的替代方法 小包。

This standard defines one of two methods of 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 is intended for use as a means of transparently conveying the audio metadata elements through the video transport in a way which allows the metadata stream reconstituted by a VANC receiver to be effectively identical to that which arrived at the VANC transmitter.An associated standard SMPTE 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 SMPTE 2020-2 defines an alternate method of mapping the metadata into ancillary data packets.