Audio Engineering Society Standards Committee

Comments on AES10 (MADI) revision

[Last printing 6 July 2001] Comments to date on Draft Revised AES10-xxxx DRAFT REVISED AES Recommended Practice for Digital Audio Engineering Serial Multichannel Audio Digital Interface (MADI) published 2001-03-09 for comment. The Comment period has closed with no resolution of the comments of Recipon. The call for comment is withdrawn and the draft will be rewritten.

Recipon 2001-04-04

From:   SMTP%""  4-APR-2001 17:28:00.71
Subj: Comment on draft Revised AES10-xxx


At page 14 ...

"7.1.5 Cable length The maximum cable length shall be at least 50 m. Equalization is not permitted. The signal shall have an eye pattern no worse than that defined by figure 9. Longer distances, for example 400 m, may be achieved by the use of re-clocking receivers."

I don't understand why you would like to limit transmission to 50m. Adaptative cable equalization chips are existing and give opportunity to transmit on a 300 m cable.

I work nowdays on such a system, and it seems to work very well (need more tests). Our application is very near to MADI transmission (TaxiChip transmission type at 125 Mbits). Using a standards component, we can transmit signal at more than 300m on a 75 ohms coax cable.

Thank you for your work and best regards

PS : Don't blame me if I'm not really in the AES policies and procedures. I'm still a new member, and need to learn so much...

RD manager
- Innova-SON

Kentish 2001-04-04

From:   SMTP%"" 25-APR-2001 13:14:06.86
Subj: Comment on DRAFT REVISED AES10-xxxx

Hello Standards@AES

A small point (in case nobody else mentioned it yet), on the pdf of the revised MADI standard.

Figure 9 (an eye-pattern diagram), has been used twice. The second occurrence (called Figure 10 but the same diagram), is meant to be an example MADI buffer circuit diagram.


William Kentish [AES Member (UK) 35280]

Thank you for your comment, the missing figure, substantively unchanged from the previous edition, has been replaced.

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