[vdr] Re: [linux-dvb] Re: Left and right audio swapped on Siemens DVB-S?

[Patrick GUENEAU <pgueneau@wanadoo.fr>]

Could this be a feature of SCART connection ?


I remember in the old days where mono sound where on TV and broadcast
that you could connect only one audio input.

Something like LEFT or MONO if RIGHT is not connected (or the opposit,
if it is what you heard).

There must be something in SCART standard that tells the TV Set if only
one audio connection
then it is MONO and transmit the MONO signal on both channels.
(it used to work like this)

Patrick.



Rainer Zocholl wrote:
> 
> Klaus.Schmidinger@cadsoft.de(Klaus Schmidinger)  07.10.01 17:30
> 
> Once upon a time Klaus Schmidinger shaped the electrons to say...
> 
> >I'm using a Siemens DVB-S card, which is connected to the TV set with
> >the cable that came with the card (Cinch and phone jack ("Klinke") on
> >the card side, Scart on the TV side. With this setup apparently the
> >left and right audio channel are swapped. I double checked this by
> >inserting
> 
> > void cDvbApi::SetVolume(int Volume, bool Absolute)
> > {
> >   if (fd_audio >= 0) {
> >      volume = min(max(Absolute ? Volume : volume + Volume, 0),
> >MAXVOLUME);       audioMixer_t am;
> >      am.volume_left = am.volume_right = volume;
> >+     am.volume_left = 100;
> 
> Tried with a Version 2.1  am.volume_left = 0;
> Only the "red" colored Cinch carries a signal.
> That's too "not the peak" of the 3,5mm jack...
> (the peak is -by convention- normaly "left")
> 
> 
> 
> >      CHECK(ioctl(fd_audio, AUDIO_SET_MIXER, &am));
> >      }
> > }
> 
> >into VDR's source, so that there would be a big difference between the
> >two audio channels. With this change the *left* channel is loud and
> >the *right* channel is almost silent (the "volume" used is the default
> >value of 255 as set when VDR starts up). I would have expected it to
> >be the other way round.
> 
> >Can anybody else confirm this observation?
> 
> Tried with 2.1 : All seems to be OK.
> 
> But i too have a "funny" effect:
> left=100;
> right=200;
> If i unplug the left channel, the right becomes louder!
> This seems to be caused by the scart "switch" box.
> Without that box every thing is as expected.
> Solution:
> -> The mono TV set plugged for tests to the box short cuts
> the L+R channels. Argl... ;-)
> 
> >Could this be a fault in the cable?
> 
> Most likely: In the adapther.
> 
> Have look in the "Kabel-FAQ" and compare the wiring of the scart plug.
> 
> http://me.in-berlin.de/~scorpio/faqkabel.html
> 
> SCART: (Male)
> 
>     1   3   5   7   9   11  13  15  17  19
>   +-----------------------------------------+
>   | Ro  Lo  Gnd Blu Gnd Grn Gnd Red Gnd Yo  |
>   |                                         \ 21
>   |   Ri  Gnd Li  12V Da1 Da2 Da3 BAS Gnd Yi  \
>   +--------------------------------------------
>       2   4   6   8   10  12  14  16  18  20
> 
> >Or is it an error on the DVB card layout?
> 
> Or in the documentation?
> 
> Or in the TV set?
> 
> --
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