SC-02-02 meeting, Online, 2023-05

Report of the meeting of the SC-02-02 Working Group on Digital audio interfaces, held online, 2023-05-02.

The meeting was convened by chair John Grant.

Present were Richard Cabot, Paul Treleaven, John Grant, Junichi Yoshio, Jim Meyer, Satoshi Oode, Stephen Scott, Andy Rosen, Fred Morgenstern, Rick Seagull

The formal notice on patent policy was read.

The agenda was approved as written.

There were no comments on the report of the previous meeting, held online, 2022-10-14.

Projects assigned to this group but not mentioned here had no action requested or required - see for details.

Open projects:

AES5-R Review of AES5-2018: AES recommended practice for professional digital audio - Preferred sampling frequencies for applications employing pulse-code modulation

This standard is due for review. Consensus in the meeting was that it should be reaffirmed..

AES10-R Review of AES10-2020: AES Recommended Practice for Digital Audio Engineering -- Serial Multichannel Audio Digital Interface (MADI)

There had been no progress on MADI over twisted pair since the previous meeting. Implementations exist using the same format as on co-ax and also using Fast Ethernet PHY chips which need a larger inter-frame gap than is currently specified in AES10. No text has been proposed for either method. The meeting proposed moving AES10 to the Annex until it is due for review (in 2025).

AES53-R Review of AES53-2018, AES Standard for digital audio - Digital input-output interfacing - Sample-accurate timing in AES47

This standard is due for review; the title refers to AES47, which has been stabilised, but it is also referenced by other standards. It was revised in 2018 to follow changes in a standard to which it refers; the meeting felt that reaffirmation would be better than stabilisation in case any further revision is needed in future.

Other projects:

No activity.


J Yoshio reported that two new Parts for IEC 61937 are at the new project proposal stage.

New projects

No new projects were proposed.

New business

No new business was raised.

The next meeting will be held online in October 2023, scheduled in conjunction with the AES 155th Convention.

AES - Audio Engineering Society