Tom, it isn't exactly the time to talk about, because not everything is working as expected, but since you started with sound card accuracy: Since a few months i am working on a project that uses a sound card as a phase comparator behind a dual mixer for ultra stable oscillator stability measurements.
Because it is a differential measurement between the two channels (which are sampled exactly the same time due to the adc hardware) the first idea was, that the effects introduced by the not so good sample clock of a ordinary sound card may cancel out completely. Unfortunately this is not the case. For that reason i bought a sound card, which's sample clock can be phase locked to a external signal, a M-Audio Delta Audiophile 192. In the (semi)professional musician's world it is somtimes necessary to get some sound cards synchronized. Currently i am working on a circuit that produces a S/PDIF signal phase locked to a 10 MHz standard frequency which in turn the sound card can phase lock on. You may imagine that the utility you wrote is more than welcome for the tests that i have in front of me. Can you send it? Best regards Ulrich Bangert > -----Ursprüngliche Nachricht----- > Von: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Im Auftrag von Tom Van Baak > Gesendet: Montag, 22. August 2005 18:33 > An: Time Nuts > Betreff: [time-nuts] Accuracy of a sound card > > > I measured the phase, frequency and Allan deviation of > the sound card on my cheap PC. You'll enjoy the results: > > http://www.leapsecond.com/pages/sound-1pps/ > > If any of you with a high-end sound card want to repeat > the experiment let me know. > > /tvb > > > > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-> bin/mailman/listinfo/time-nuts > _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts