This seemed to be true of at least the older AES3 interfaces on
Wheatstone boards. If the "consumer bit" was set in the header, the
board wouldn't accept data. Our Logitek boards ignored that bit. For the
first few years of operation we used some $25 USB to TOSLINK (Optical
SPDIF) block bought on eBay connected to an TOSLINK to AES3 converter.
We stopped when the drivers for those fell out of a new Centos release.
The same outfit also made USB to coaxial (RCA pin jack) SPDIF versions.
I found a nice paper written by Rane that goes into some detail about
converting AES and SPDIF at the electrical level.
https://www.ranecommercial.com/legacy/pdf/ranenotes/Interfacing_AES3_&_SPDIF.pdf
<https://www.ranecommercial.com/legacy/pdf/ranenotes/Interfacing_AES3_&_SPDIF.pdf>
- Bill
On 2/21/22 6:20 AM, Fred Gleason wrote:
On Feb 20, 2022, at 16:46, Rob Landry <41001...@interpring.com> wrote:
I have connected SPDIF outputs to AES/EBU inputs and had them work;
I've not tried the other way around. I recall reading somewhere that
the differences between the two are essentially that AES/EBU is
balanced and SPDIF is unbalanced. The voltage levels are different
too, I think.
The data header formats are different too. _Usually_, these
differences can be ignored; although I have run across some gear (the
old 360 Systems ‘Instant Replay’ unit comes to mind) where the AES3
input refuses to process any signal that doesn’t have the correct AES3
header. I don’t believe this should be a problem for ASI cards though.
Cheers!
|---------------------------------------------------------------------|
| Frederick F. Gleason, Jr. | Chief Developer |
| | Paravel Systems |
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| A room without books is like a body without a soul. |
| |
| -- Cicero |
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Bill Putney
Chief Engineer - KPTZ
Private Pilot-Single Engine Land | A & P / IA Mechanic
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