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Embedded audio

Digital audio that is multiplexed and carried within an SDI connection.

Embedded audio is audio payload which is (typically) the soundtrack (music, dialogue, and sound effects) for the video program. Two standards, SMPTE 272M (for SD) and SMPTE 299M (for HD and 3G) define how audio is embedded into the ancillary space. The SD and HD standards provide for up to 16 channels of PCM audio, while 3G allows up to 32 channels, typically encoded in the AES3 format. In HD, the embedded audio data packets are carried in the HANC space of Cb/Cr (chroma) parallel data stream.

In addition, both standards define audio control packets. The audio control packets are carried in the HANC space of the Y (luminance) parallel data steam and are inserted once per field at the second video line past the switching point (see SMPTE RP168 for switching points of various video standards). The audio control packet contains audio-related metadata, such as its timing relative to video, which channels are present, etc.

Embedded audio packets are Type 1 packets.

Key Terms

audio
audio control packets
audio payload
channels
definition
hd
sd
soundtrack
standards
usage

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Acronymn

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Synonymns

Embedded audio
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Sources & Credits

Last modified on February 18 2020
Content adapted from Wikipedia
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