Just registered and after a long research... The set: Wolfson card on Raspberry Pi B Volumio 1.55 with the patch of Ragnar Yamaha RX-V595RDS very cheap cinch auido cable, about 1.5m (for sure not a chance to be 75 Ohm) some mp3, FLAC files The history: Headset out: OK Line-out: OK SPDIF Out: the receiver complains with "data error" CD-Player with a coaxial cable (the very cheap one): OK (SPDIF) The specs: Yamaha RX-V595RDS has input rate 48Khz, 16 bit (or 24, not sure) Wolfson SPDIF output: ?? (192KHz maybe? or depends on the bitrate of the file?) I suppose that the problem should be the incompability between the Wolfson SPDIF and the Yamaha RX-V595RDS input and in particular the rate too high... But it could be also wrong. The question(s): How can I set 48KHz rate on SPDIF out? Could there be another reason for the "data error" And any other suggestions (except for other than RaspberryPI/Wolfson card) are welcome, of course.

How can I set the SPDIF Out of a Wolfson card for 48KHz output

Former Member over 10 years ago

Just registered and after a long research...

The set:

Wolfson card on Raspberry Pi B
Volumio 1.55 with the patch of Ragnar
Yamaha RX-V595RDS
very cheap cinch auido cable, about 1.5m (for sure not a chance to be 75 Ohm)
some mp3, FLAC files

The history:

Headset out: OK
Line-out: OK
SPDIF Out: the receiver complains with "data error"
CD-Player with a coaxial cable (the very cheap one): OK (SPDIF)

The specs:

Yamaha RX-V595RDS has input rate 48Khz, 16 bit (or 24, not sure)
Wolfson SPDIF output: ?? (192KHz maybe? or depends on the bitrate of the file?)

I suppose that the problem should be the incompability between the Wolfson SPDIF and the Yamaha RX-V595RDS input and in particular the rate too high... But it could be also wrong.

The question(s):

How can I set 48KHz rate on SPDIF out?
Could there be another reason for the "data error"

And any other suggestions (except for other than RaspberryPI/Wolfson card) are welcome, of course.

0 clem57 over 10 years ago

Looking at the protocol for the digital bits for SPDIF, there is a check for even/odd parity. Should this be wrong, a possible data error would occur.
clem
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0 Former Member over 10 years ago

You could try my .asoundrc file. It locks the Wolfson card to 48kHz.
http://www.element14.com/community/message/107289/l/re-pjsippjsua-with-wolfson-audio-card#107289
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Ragnar
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0 Former Member over 10 years ago
Thanks, Ragnar.. Clem..

I have tested the suggestion of Ragnar... Not a chance..

But, I think, I found the problem, though, fortunately at home there is another unit with coaxial SPDIF-In and it has no problem at all with every cofiguration. So it seems, the problem is the Yamaha receiver. Well it is very old one, at least 17 years, still it serves very good.

I have read, the Wolfson SPDIF Out were somehow not exactly compatible with the norms, because of the voltage. I have tested with another cable, still not 75 Ohm, still "data error"

Anyway, I have following options:
buy new receiver: apart from the expenses, I would not need most probably any Wolfson card + Raspberry anymore
listen to the line-out:still the cheapest option, I have to buy "only" better cable.
some kind of adapter SPDIF in to SPDIF out: still risky if not compatible the Yamaha
using the cheap no-name unit (not sure what is it, It plays just everything)... and forget for a while for the extra quality.
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0 clem57 over 10 years ago in reply to Former Member

Yes it is a good one back in it's day. But technology moves along and maybe things work but not to new specs.
Sorry,
clem
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0 Former Member over 10 years ago in reply to clem57

I am afraid on the very end I have to buy some new receiver, it could be Yamaha RX-V777 (because of the Phono input) whereas it must be not Yamaha.

I am thinking now if a converter SPDIF -> TOSLINK should do the trick. I have already test the optical input with a Cubox (which has limted upto 48KHz rate) and it was OK. I use however the Cubox rather for TV. But that was what I meant: I could buy second Cubox which would do what I needed. The price would be not any different from RaspberryPi + Wolfson + box + power adapter. Admited, the Wolfson can much more, though.

I think meanwhile, the problem seems not to be the rate too high, because I don't have rates over 48Khz anyway, but rather something electrical. So, I think I would give a try for some SPDIF to TOSLINK converter. I have found something from Ligawo: cheap enough for testing.
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