On Wednesday 31 January 2007 09:58, Istvan Gabor wrote:
> > Hi there!
> >
> > have you tried with alsamixer? make sure that the
>
> "Capture" settings are > reasonable...
>
>
>
> Hi Martin:
>
> I checked again the settings in alsamixer more carefully and
> realized that an option called IEC958 (I have no idea what
> this is) were turned on alongside the microphone. 

A digital interface protocol that is used to transfer digital audio data 
between professional digital audio equipment such as PCM and DAT mastering 
recorders, MDM recorders and other equipment. This protocol is most commonly 
known as AES/EBU, but IEC958 Part-4 is the actual name for it. Two channels 
of digital audio are carried on a single line. An XLR-type connector and a 
shielded cable is typically used. More recently a two-line standard has come 
in to play as more people are working with 24/96 material.

IEC958 
A standard for digital audio transfer published by the IEC (International 
Electrotechnical Commission). The IEC958 standard describes (specifically in 
IEC958 Part 3 and IEC958 Part 4) the protocol used by what we commonly refer 
to as AES/EBU (now called AES3) and S/PDIF for transferring digital audio 
data between hardware platforms.

In your case it's likely the s/pdif interface for the sound card.


> This 
> option is hidden in KMix and KAmix.  If this IEC958 is
> turned on, it blocks capturing from the microphone.  It is
> also interesting that this IEC958 is the only channel that
> can be turned on while another channel is on.  All the other
> channels are exclusive, ie turning on one of them disables
> the other one (except this 958).
>
> The point is that the problem has been solved.
>
> Thanks!
>
> IG
>
>
>
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