linuxaudio.org

On Sat, January 26, 2013 4:52 am, Fons Adriaensen wrote:
> Word clock only at 48 kHz seems to be a limitation of some particular

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> equipment. It's not clear to me why things should be that way, I can't

> see a good technical reason for it.

Maybe, it has to do with the boxes I was looking at being ADAT boxes.
> I don't think there is a 'standard practice' for audio clock distribution,

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> it will very much depend on the nature of the installation. If there's

> anything video in house as well the primary source is likely to be video,

> with audio derived from it. I a large facility with many studios the

> system will be layered - a GPS driven master with an atomic standard as

> backup driving a second level master generator in each studio. In such

> a case the signal between the primary and secondaries could be video or

> just 1, 5, or 10 MHz if no video sync is needed.

So with video master the audio clock would be derived from the colour

sub-carrier then? (horizontal seems kinda low) It seems odd that for a

non-video source an even ten based frequency would be used rather than

something like 1.536M for example, that divides evenly.
> A few years ago that could have made sense as there were few MADI routers.

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> But e.g.  will allow per

> channel routing between 16 MADI ins and outs. Of course a wall of AES3

> connectors looks cool... In practice the choice may be driven by any

> existing wiring and in-house standards if e.g. a studio is upgraded.

1024 channels of routing seems like more than anyone could need, but I

remember terminating a wall full of audio lines at one of my first jobs in

a small town radio station, so I am sure there are places with more than

one of these boxes.
> Probably yes, AES3 (known as AES/EBU here) surely is free. AES 3 allows

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> unbalanced connections using coax and BNC, this may be a good option for

> installations that have existing video wiring. But if the connector is

> XLR the signal MUST be transformer balanced.

So AES10 (MADI) should be just as free? Or am I missing something? I know

there is a charge for the documentation for both AES 3 and AES 10, but is

there a use fee as well?
--

Len Ovens

www.OvenWerks.net
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