Clicking when toslink is output to digital mixer

[GoogleCodeExporter]

What soundcard to you have (make, model, chip)?
C-Media 8 Channel PCI Surround 3D Sound Card DTS found here
http://www.amazon.com/C-Media-Channel-Surround-Optical-Toslink/dp/B003KR2R1U

What steps will reproduce the problem?
1. installed card and drivers, connected digital out of card to digital mixer 
in via toslink card output, digital in from mixer via toslink card input
2. Setup is normal, sound output works. but card needs to slave to toslink 
clock from mixer, not from the clock in the card
3. clicking and crackling noises occur since card is not slaved to toslink 
spdif clock from mixer. Card needs to be the slave, not the master clock. Is 
this possible

What is the expected output? What happens instead?
Expected no clicking or crackling. Without a setting to slave the card clock to 
the external spdif signal, clicking and crackling happens

What version of the driver are you using? On what operating system? What 
version of the operationg system are you using (32 or 64 bit)?
Win XP Pro, 32 bit latest version of the driver (CMIDriver-1.2.6-bin-x86)

What ports of the soundcard are affected by the bug (e.g. SPDIF, Mic-In)?
spdif

Please provide any additional information below.
I don't know if it's even possible for this card to do this, but other sound 
cards have the ability to slave to an external spdif source, while outputting 
sound generated internally from the computer. Does the cmedia chip have the 
ability to do this? Just curious....

thanks

Original issue reported on code.google.com by alipi...@gmail.com on 11 Jun 2010 at 11:44

[GoogleCodeExporter]

I think to have the ability to "slave" the card to mixers toslink clock, you 
needed to have the possibility to connect that clock signal to the card itself, 
since the toslink connection is not bidirectional, so the trasmitter transmits 
the receiver reveives, and no communication... The cracking and popping is 
maybe due to the low quality of the output of the card, I remember something 
like this with my card(8768 st-lab), but for it I have a digital interface that 
I've built myself and I could improve it... Have you checked the problem with 
other devices, or does it only occure with thie mixer?

Original comment by gazsi...@freemail.hu on 20 Aug 2010 at 9:57

[GoogleCodeExporter]

Clock recovery and sync can in general be done on a unidirectional SPDIF 
signal, but I don't think that the cmedia card has the hardware capability for 
that. It's a cheap consumer device after all.

Original comment by dogb...@gmail.com on 11 Sep 2010 at 5:51

• Changed state: Invalid