AES Standards News Blog

July 2012

AES41, Audio-embedded metadata parts 1 to 5, has been published

A new multi-part revision of AES41 has been published 2012-07-20. In this revision, the application of the underlying technology has beens expanded from the single role of carrying re-coding metadata to carrying a range of audio-related metadata types.This five-part suite revises and substantially extends AES41-2009: "AES standard for digital audio - Recoding data set for audio bit-rate reduction"

AES41 provides for the carriage of audio metadata by embedding it in the audio samples themselves. This tightly associates the metadata with the audio, yet makes it fragile so that changes to the audio will invalidate the metadata. Several metadata sets have been defined, covering applications such as cascaded compression (bit-rate reduction), and loudness control. These parts are:

AES41-1-2012, "AES standard for digital audio - Audio-embedded metadata - Part 1: General"  Part 1 specifies the method by which a metadata set is embedded in the audio samples. Other parts define the content and format of the metadata sets. This part revises AES41-2009.  http://www.aes.org/publications/standards/search.cfm?docID=37

AES41-2-2012, "AES standard for digital audio - Audio-embedded metadata - Part 2: MPEG-1 Layer II or MPEG-2 LSF Layer II"  Part 2 describes the format for the data to be transmitted with audio decoded from MPEG-1 Layer II or MPEG-2 LSF Layer II encoding. The data may be used to aid a subsequent re-encoding process. This part revises AES41-2009.  http://www.aes.org/publications/standards/search.cfm?docID=87

AES41-3-2012, "AES standard for digital audio - Audio-embedded metadata - Part 3: AAC & HE-AAC"  Part 3 describes the format for the data to be transmitted with audio to signal downmix coefficients, loudness and dynamic range control metadata as used in ISO/IEC 14496-3:2009 Subpart 4 (AAC and HE-AAC). A method of carrying this data is described in Part 1 of this Standard. This part is new.  http://www.aes.org/publications/standards/search.cfm?docID=88

AES41-4-2012, "AES standard for digital audio - Audio-embedded metadata - Part 4: Dolby E"  Part 4 describes the format for the data to be transmitted with audio to signal downmix coefficients, loudness, and channel configuration metadata as used Dolby E. This part is new.  http://www.aes.org/publications/standards/search.cfm?docID=89

AES41-5-2012, "AES standard for digital audio - Audio-embedded metadata - Part 5: EBU loudness, true-peak, and downmix"  Part 5 describes the format for the data to be transmitted with audio to signal loudness and true peak metadata as used in EBU Technical Recommendation R128. This part is new.  http://www.aes.org/publications/standards/search.cfm?docID=90

Click on the links above to access individual documents.  Alternatively, go to http://www.aes.org/publications/standards/  and search using "AES41" to find the whole set. 

 


Posted: Friday, July 20, 2012

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