Am Sonntag 30 Mai 2010 schrieb Karsten Wiese:
> Am Freitag 28 Mai 2010 schrieb fons@email-addr-hidden:
> > 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?
ah erm, just found "the winners" thread.
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Received on Sun May 30 20:15:05 2010
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