Am Freitag 28 Mai 2010 schrieb [email protected]: > On Fri, May 28, 2010 at 08:30:54AM -0700, Niels Mayer wrote: > > > Audio ADCs and DACs have three important inputs; > > the signal input, the voltage reference, and the clock. > > Noise and interference on the voltage reference causes > > amplitude modulation, and jitter on the clock causes > > phase modulation. The resulting modulation products > > look very similar in the frequency domain. One of the > > authors once spent several days trying to track down a > > low-frequency jitter problem, only to find that it was > > in fact a problem of LF noise on the voltage reference. > > You're close. See the extra hint in a previous post.
Sound Card A's DAC and ADC share the same voltage reference, which has a 100 Hz ripple? Regards, Karsten _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
