Re: [Alsa-user] Duplicate sound in two sound cards

2006-12-16 Thread Dominique Michel
Le Sun, 29 Oct 2006 13:52:52 -0500,
Lee Revell [EMAIL PROTECTED] a écrit :

 On Sun, 2006-10-29 at 15:44 -0300, Salatiel Filho wrote:
  Hi guys, i have two sound stereo cards on my machine and i'd like to
  know if it is possible play the same sound in both at same time.
  I'm not talking about virtual 4 channels sound cards , i just want ,
  
  
  Channels : 
  Left on card 0 = left on card 1 
  right on card 0 = right on card 1
  
  
  Could anyone provide me a sample to put on my asoundrc ?
 
 Cannot be done easily.  The two cards will consume data at different
 rates as their clocks will not be synced.
 
It can be done if you have some hardware skills and exactly the 2 same sound
cards. For that, you must use the sync of one card for the 2 cards. It mean to
remove the quartz on one card and sold a little coaxial cable from the quartz
on the first card to the removed quartz on the second card.

Such quartz have 3 pins: input, ground and output. The shield of the coaxial
must be connected on the ground of one card but free at the other extremity
(it will do a ground loop if you connect both ends), the central wire must be
connected between the output of the quartz to the input of the removed quartz.

Done blame me you your(s) sound card(s) goes broken after such a modification.
(It is impossible to know if it will work and if the IC on the first sound card
will be able to drive 2 cards without to try it...)  Note at the parasitic
capacitance of the coaxial cable will modify the frequency a little, so use a
low capacitance cable.
 
Dominique

 You could set up 2 instances of JACK, run one for each card and connect
 them with netjack or jack_diplomat, but that will only allow you to run
 JACK-aware apps.
 
 Lee
 
 
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Re: [Alsa-user] Duplicate sound in two sound cards

2006-12-16 Thread Sergei Steshenko
On Sat, 16 Dec 2006 10:36:03 +0100
Dominique Michel [EMAIL PROTECTED] wrote:

 Le Sun, 29 Oct 2006 13:52:52 -0500,
 Lee Revell [EMAIL PROTECTED] a écrit :
 
  On Sun, 2006-10-29 at 15:44 -0300, Salatiel Filho wrote:
   Hi guys, i have two sound stereo cards on my machine and i'd like to
   know if it is possible play the same sound in both at same time.
   I'm not talking about virtual 4 channels sound cards , i just want ,
   
   
   Channels : 
   Left on card 0 = left on card 1 
   right on card 0 = right on card 1
   
   
   Could anyone provide me a sample to put on my asoundrc ?
  
  Cannot be done easily.  The two cards will consume data at different
  rates as their clocks will not be synced.
  
 It can be done if you have some hardware skills and exactly the 2 same sound
 cards. For that, you must use the sync of one card for the 2 cards. It mean to
 remove the quartz on one card and sold a little coaxial cable from the quartz
 on the first card to the removed quartz on the second card.
 
 Such quartz have 3 pins: input, ground and output. The shield of the coaxial
 must be connected on the ground of one card but free at the other extremity
 (it will do a ground loop if you connect both ends), the central wire must be
 connected between the output of the quartz to the input of the removed quartz.
 
 Done blame me you your(s) sound card(s) goes broken after such a modification.
 (It is impossible to know if it will work and if the IC on the first sound 
 card
 will be able to drive 2 cards without to try it...)  Note at the parasitic
 capacitance of the coaxial cable will modify the frequency a little, so use a
 low capacitance cable.
  
 Dominique
 
  You could set up 2 instances of JACK, run one for each card and connect
  them with netjack or jack_diplomat, but that will only allow you to run
  JACK-aware apps.
  
  Lee
  
  
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  easier
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Dominique,

I am not sure I understand exactly what you mean, but if it's

/---\
|   |
|--|+|--|\|--|
| card_1 generator | | XTAL | | card_2 generator |
|--|+|--|/|--|
|   |
\---/

, then most likely it won't work - because nobody can be shure that
the two generator circuits connected in parallel will work.

Some generator circuits allow XTAL-less operation with external clock,
but then it's not the above diagram.

--Sergei.

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Re: [Alsa-user] Duplicate sound in two sound cards

2006-10-29 Thread Lee Revell
On Sun, 2006-10-29 at 15:44 -0300, Salatiel Filho wrote:
 Hi guys, i have two sound stereo cards on my machine and i'd like to
 know if it is possible play the same sound in both at same time.
 I'm not talking about virtual 4 channels sound cards , i just want ,
 
 
 Channels : 
 Left on card 0 = left on card 1 
 right on card 0 = right on card 1
 
 
 Could anyone provide me a sample to put on my asoundrc ?

Cannot be done easily.  The two cards will consume data at different
rates as their clocks will not be synced.

You could set up 2 instances of JACK, run one for each card and connect
them with netjack or jack_diplomat, but that will only allow you to run
JACK-aware apps.

Lee


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Re: [Alsa-user] Duplicate sound in two sound cards

2006-10-29 Thread Avuton Olrich
On 10/29/06, Salatiel Filho [EMAIL PROTECTED] wrote:
 Hi guys, i have two sound stereo cards on my machine and i'd like to know if
 it is possible play the same sound in both at same time.
 I'm not talking about virtual 4 channels sound cards , i just want ,


 Channels :
 Left on card 0 = left on card 1
 right on card 0 = right on card 1


 Could anyone provide me a sample to put on my asoundrc ?

You could also use pulseaudio or MPD.
-- 
avuton
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