[linux-audio-user] Recording from SPDIF with SB live

Christophe Vescovi vescovi at lpsc.in2p3.fr
Fri Dec 12 03:20:36 EST 2003

lau at hippie-online.de a écrit :

> Yes, you are right, this works (and is not possible using alsamixergui)
> - thank you! *But* it definitely results in a DA-AD conversion because
> - I can record in arbitrary sampling rates without problems
> - When I stop the tape the input level remains about -70 dB
> Is this a particular weakness of the SB live? What card supports exact
> recording from SPDIF-in?
> Ciao,
>  HippiE

Yes this is a well known problem of the SB Live. The EMU10K1 Chips work 
only at 48kHz and the SPDIF input is resampling the data to 48kHz 
whatever is the input sample rate (even if this is 48kHz). So it's not 
possible to do sample accurate digital copy from SPDIF-in. Most semi-pro 
audio cards support exact recording from SPDIF, the M-audio cards for 
example are well supported under Linux (the Audiophile is a good 
candidate if you don't need multiple IO).


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