On Tue, 2007-12-18 at 23:38 +1100, simon wise wrote:
On 18 Dec 2007, at 10:22 PM, tania habib wrote:
I am working on Mac Pro osx 10.4, I have not tried the two different soundcards option, we use the multichannel sound card for our recordings.
the OSX audio system does have a system to join two different soundcards -open Audio MIDI Setup (usually in the Utilities folder) -then open the Aggregate Devices Editor from the Audio menu - here you can create a new device, select which will be the
master clock etc -this new device can then be selected and used in the usual manner
hey, that is cool to know (as a non-osx user, i wouldn't have expected something like that to exist, but i think, i know quite some people who could benefit from that). just in case you know: do you have an idea how this system deals with the fact, that each of this cheapo soundcards have their own clock? does it use one as the master clock and does apply a samplingrate conversion to the other in order to sync it? i am asking, because i would like to know, if any decrease in sound quality is expected when you use aggregate.
roman
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On 19 Dec 2007, at 9:51 AM, Roman Haefeli wrote:
hey, that is cool to know (as a non-osx user, i wouldn't have expected something like that to exist, but i think, i know quite some people
who could benefit from that). just in case you know: do you have an idea how this system deals with the fact, that each of this cheapo soundcards have their own clock?
does it use one as the master clock and does apply a samplingrate
conversion to the other in order to sync it? i am asking, because i would like to know, if any decrease in sound quality is expected when you use aggregate.
I've used it a couple of times to get some extra outputs from a
laptop, and it has worked fine but I haven't used it extensively.
There are options to choose which clock source is used, and options
(for each physical device) to re-sample the audio so it seems that it
will re-sample if you choose, or not if it works ok without - I guess
that would depend on things like the abilities of the cards and their
drivers.
It has been around for a while - maybe introduced in OSX 10.3???
simon
Well now I am facing a problem, I guess I was too excited to really check whether this option worked properly or not! The problem is that I have a patch in Pd, where I am using adc~, writesf~ to write the streaming data into wave files. When I initialize Pd, it recognizes the aggregate device, I click on it and select the no. of channels to the total no. of inputs I have with the aggregate device, say 8. When I start the recording and finish it. Open the wav files in audacity, only two channels seems to be active the rest have nothing in them! Can someone, who has used this feature to do recording with Pd please let me know, what I am doing wrong!. thanks tania
On Dec 19, 2007 2:00 AM, simon wise simonxwise@hotmail.com wrote:
On 19 Dec 2007, at 9:51 AM, Roman Haefeli wrote:
hey, that is cool to know (as a non-osx user, i wouldn't have expected something like that to exist, but i think, i know quite some people who could benefit from that). just in case you know: do you have an idea how this system deals with the fact, that each of this cheapo soundcards have their own clock? does it use one as the master clock and does apply a samplingrate conversion to the other in order to sync it? i am asking, because i would like to know, if any decrease in sound quality is expected when you use aggregate.
I've used it a couple of times to get some extra outputs from a laptop, and it has worked fine but I haven't used it extensively. There are options to choose which clock source is used, and options (for each physical device) to re-sample the audio so it seems that it will re-sample if you choose, or not if it works ok without - I guess that would depend on things like the abilities of the cards and their drivers.
It has been around for a while - maybe introduced in OSX 10.3???
simon
hi tania
Quoting tania habib taniahabib@gmail.com:
When I start the recording and finish it. Open the wav files in audacity, only two channels seems to be active the rest have nothing in them!
do you get a signal on all 8 input channels? (use [env~]; or if you are lazy, just open the "test audio and midi" patch)
or is there some patching problem?
fgmadsr IOhannes
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yes I tried the test audio patch, all the input channels are active but it seems that only the first two are getting the input the rest have noise . When I play the recorded wave files, only the first two channels have the input the rest have noise! I am sending the pd patch that I am using, Please let me know if there is some bug in the patch!
On Dec 19, 2007 1:48 PM, zmoelnig@iem.at wrote:
hi tania
Quoting tania habib taniahabib@gmail.com:
When I start the recording and finish it. Open the wav files in audacity, only two channels seems to be active the rest have nothing in them!
do you get a signal on all 8 input channels? (use [env~]; or if you are lazy, just open the "test audio and midi" patch)
or is there some patching problem?
fgmadsr IOhannes
This message was sent using IMP, the Internet Messaging Program.
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tania habib skrev:
I am sending the pd patch that I am using, Please let me know if there is some bug in the patch!
Hi I tried your patch its not really a stable solution. Use [writesf~ 8] for recording then you get one 8ch-file-.wav. Audacity can open multichannel files. From there export multiple as monofiles.
mvh/Stef
tania habib schrieb:
Well now I am facing a problem, I guess I was too excited to really check whether this option worked properly or not! The problem is that I have a patch in Pd, where I am using adc~, writesf~ to write the streaming data into wave files. When I initialize Pd, it recognizes the aggregate device, I click on it and select the no. of channels to the total no. of inputs I have with the aggregate device, say 8. When I start the recording and finish it. Open the wav files in audacity, only two channels seems to be active the rest have nothing in them!
How did you use writesf ? Did you specify the number of channels ? If not look at the help patch of writesf ...
LG Georg
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Georg Holzmann -
Roman Haefeli -
simon wise -
Steffen Leve Poulsen -
tania habib -
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