Re: USB Audio and selecting optical out

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On Tue, Apr 24, 2018 at 02:43:01PM +0200, Clemens Ladisch via Alsa-user wrote:
> Marc Haber wrote:
> > Looks to me like it at least claims to be able to play back at 44.1 kHz.
> > Any other reason why the DAT deck won't sync if speakertest runs with
> > rate 44100?
> 
> Check if it's actually using 44.1 kHz when playing.

How would I do that?

> > Is this likely a sloppy implementation of the Device or a bug in the driver?
> 
> S/PDIF has lots of metadata bits, but the USB audio 1.x specification does
> not have any mechanism to change them.  These bits must be set automatically
> by the device.  (Usually, receivers don't really care about them.)

I see.

> The CM106 datasheet mentions a register to control the S/PDIF output, but
> its contents are undocumented.  It's possible that this works only with the
> Windows driver.

That looks like "game over" here. Alas, too bad...

I am open to suggestions for devices that will do what I want and work
on Linux. I am willing to spend up to 150 Euro, but beyond that it looks
like my playback will continue to be analog. It's unlikely that my DAT
decks will ever _write_ to a tape again anyway.

Greetings
Marc

-- 
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Marc Haber         | "I don't trust Computers. They | Mailadresse im Header
Leimen, Germany    |  lose things."    Winona Ryder | Fon: *49 6224 1600402
Nordisch by Nature |  How to make an American Quilt | Fax: *49 6224 1600421

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