Steve Do you mean?: http://www.firecom.com/
Bruce steve heidmann wrote: > Firecomm.com has some nice parts to look at > > --- On Tue, 1/13/09, Demian Martin <[email protected]> wrote: > > From: Demian Martin <[email protected]> > Subject: Re: [time-nuts] Sound Cards > To: [email protected] > Date: Tuesday, January 13, 2009, 4:05 PM > > > Magnus Danielson wrote: > > >>> The digital link in question is S/PDIF; with the current popularity >>> of Home Theater systems cheap cards with digital I/O have become >>> quite prevalent. As an added bonus, S/PDIF can be run over both >>> coaxial and optical media, the latter being attractive in further >>> isolating PC noise from any measurement setup. And of course, a >>> manufacturer's evaluation board is much better documented and >>> > more > >>> suited to measurement-specific mods than a random sound card. >>> >> The optical link commonly being used for S/P-DIF is TosLink and it seems >> like it can be the cause of many problems. It seems like some care in >> doing the optical link setup is needed. I have never digged into why the >> optical links have that problem. I can only guess, but bad optical >> coupling seems reasonable. The multimode "fiber" seems to be >> > leaving one > >> or two things to ask for. >> >> Cheers, >> Magnus >> > > Without getting too "audiophile" there are several considerations. > Toslink > is bandwidth limited- the LED's are not really fast enough for 96K and > really not for 192K sampling. The effect is high jitter on the link or a > lost connection. The high jitter may not matter if the sampling is done with > the external capture system (most of which are much more expensive). SPDIF > or AES/EBU don't have the bandwidth limitation but can have other issues. > The cheap ones don't have transformer isolation, however the transformers > can increase the jitter on the link. You can use external USB capture, I'm > playing with an EMU Tracker pre gadget that seems to do 192K at 24 bits > pretty well and for $125. But I get better results from the ESI Juli@ pci > card for around the same price, very low distortion and noise, and good Alsa > support in Linux. It may be all that's needed. > -Demian > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
