On 22/02/2022 5:35 am, Bill Putney wrote:
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>
That's handy to have thanks :)
I haven't tried connecting the ASI5111 digital I/O to anything yet to
see if the output is working by default so I'm not sure if it's even
going regardless of what 'Audio Ports' doesn't report.
The card only shows as having one output but this is all I got on on my
non-Linux machine too, the digital output was just a clone of whatever
was on the analogue outputs.
This might be a deciding factor to keep it analogue as the upstream
interface I want to use costs half the price of another ASI card, and
having digital was a deciding factor for getting it. So I might put this
off now until I upgrade the ASI card some time.
Thanks again for that pdf link.
- 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!
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