linuxaudio.org

Am Freitag 28 Mai 2010 schrieb fons@kokkinizita.net:

quoted text
> 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

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