tania habib wrote: > Hi Derek, > I am working on Mac Pro osx 10.4, http://www.apple.com/pro/techniques/aggregateaudio/
Hope this helps, Claude > I have not tried the two different > soundcards option, we use the multichannel sound card for our > recordings. > But we wanted to try the recording with iMic's, do you know a link or > a way to link two or multiple iMics together? > > Thanks for the link, it looks interesting, I will check it out in > detail but this is not the direction we want to proceed at the moment. > tania > > On Dec 18, 2007 12:06 PM, Derek Holzer <[EMAIL PROTECTED]> wrote: >> Hi Tania, >> >> are you able to record from two different soundcards simultaneously in >> any other application on your computer? I ask because this isn't usually >> the case in my experience. Many have dreamed of linking several "el >> cheapo" soundcards to get an inexpensive multichannel soundcard from >> them. Two (or more) different soundcards have two different sample >> clocks and these won't be in sync, among the main problems. Google "el >> cheapo soundcard", or check here: >> >> http://quicktoots.linuxaudio.org/toots/el-cheapo/ >> >> To see how this might be accomplished on Linux. There, it requires the >> hardware modification of removing the clock from one card and connecting >> it to the clock of one master card. >> >> And I quote: >> >>> The challenge in recording with more than one soundcard at once in any >>> computer under any operating system is to make the cards syncronize. The >>> actual sample rate of each card is depending on the crystal used in the >>> card. To cut the component cost of consumer grade soundcards cheap >>> crystals, with wider tolerances than those used in pro equipment, are often >>> used. As a result, when using two cards at once one can have a real sample >>> rate of 44.099 kHz in one card and a samplerate of 44.101 kHz in the other. >>> This is no problem when recording with one card only, but the difference in >>> the sample rates will cause phase shifts in the recording when using two >>> cards. Phase shifts make the high frequencies of the recording e.g. cymbals >>> sound bad. Further, not all audio drivers can drive cards that are not in >>> exact samplerate sync. >>> >>> Some pro-cards come equipped with a link to connect multiple cards to run >>> in sync. Consumer cards do not have this feature. This Howto describes a >>> simple hardware modification to create such a synchronisation link between >>> consumer grade cards. Without hardware modifications it is very difficult >>> to ensure the cards are in sync. >> >> You haven't mentioned the operating system you are running, BTW... >> >> Maybe other operating systems allow multiple (consumer) soundcard >> recording, I haven't tried. In PD, I don't think it's possible. If you >> had a way of getting your two IMics to be seen as one soundcard (the >> Linux el cheapo method), then you could try it. >> >> best, >> d. >> >> >> tania habib wrote: >>> Hi List, >>> I have a question regarding a patch that I made for recording >>> multi-channel audio. >>> For the 16 channels, we are using Fireface 800 with an extension >>> board. It works quite well! >>> For a specific application, we are trying to use the two iMic's with a >>> USB plug to record at least 4 channel audio. >>> When I initialize PD and select the audio settings, it shows me two of >>> these seperately in the option, the recording for one works but not >>> for the other! >>> The question is if I can use PD to record simultaneously from two >>> different source from a single patch or somehow get the recording from >>> both! >>> regards, >>> Tania >>> >>> _______________________________________________ >>> [email protected] mailing list >>> UNSUBSCRIBE and account-management -> >>> http://lists.puredata.info/listinfo/pd-list >>> >> -- >> derek holzer ::: http://www.umatic.nl ::: http://blog.myspace.com/macumbista >> ---Oblique Strategy # 94: >> "Is it finished?" >> > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list _______________________________________________ [email protected] mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
