Subject: [xl7] Re: XL-7 S/PDIF format?
Scott-
Thanks for the information. (digital out is 20-bit, 44.1kHz)
What happens to this signal at the receiver end? If the device
says it supports 16-bit conversion, can it read the 20-bit data?
If the device supports 24-bit conversion, does it translate the 20-
bit data to 24-bit depth?
I'm not sure how to get these settings right, especially with the
two pieces of equipment that I need it for: the Emagic EMI 2|6
USB interface (which supports 16 or 24 bit) and the Yamaha
AW2816 (which also supports 16 or 24-bit.) There is no 20-bit
setting for these, that I know of.
I will need to check with the manufacturers for help on this.
-Forneau
--- In xl7@y..., Scott Ruda <scottr@e...> wrote:
>
> On Monday, May 20, 2002, at 05:24 PM, forneau wrote:
>
> > I'm disappointed that this basic information (sample rate, bit
> > depth) is not mentioned in any Emu documentation. Every
other
> > piece of equipment I have with digital I/O capability clearly
states
> > this information.
>
> It's 20 bit, 44.1kHz. Note that this information is essentially
encoded
> into the signal, so a receiver should be able to auto-detect the
format
> without user intervention. But if your receiver requires you to set
this
> information manually, now you have the information you need.
>
>
> > Maybe the digital out is like the USB port: not actually
functioning
> > until a later OS. Or, maybe it's just broken in my machine.
>
> The SPDIF has been working since day one of shipment. Many
people are
> using it with great success. Note also that USB is now
functional with
> Windows drivers - Mac drivers are due late summertime. See
the E-Loader
> 1.1 information at the E-mu website:
> <http://www.emu.com/support/eloader.html>
>
> We have seen that some receivers have troubles with
receiving SPDIF
> well. The basic problem with SPDIF is that it is very difficult to
> supply it and still have the unit pass FCC radiation emission
> requirements. So, unfortunately, the signal must be clamped
down to a
> value needed to meet legal FCC emissions levels, but it still
meets the
> SPDIF spec. There are electrical hacks that can be done to the
output
> circuitry to make the signal stronger, but we can't legally sell
the
> product that way. If your receiver is having trouble, you might
consider
> either a different receiver that is more sensitive, or finding a
tech
> that is competent (and willing) to try doing the electrical
> modifications. Note that doing this can cause noise problems
with other
> equipment in your studio (besides being illegal ;-). Contact me
offline
> if you are considering this alternative.
>
> Scott
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