linuxaudio.org

fons@kokkinizita.net wrote:

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.

>

> Ciao,

>   

AM could be caused by residual ripple from the DC source, but the signal

was clearly separated from any 50 Hz harmonics. So it wasn't LF noise on

the voltage reference?

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