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 > 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, > 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. > But e.g. <http://www.directout.eu/en/products/m.1k2.html> 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 > 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 _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
