linuxaudio.org

On Fri, 28 May 2010, Ralf Mardorf wrote:
>>> The 100 Hz (being 2x 50Hz, the power freq. in Italy)

quoted text
>>> suggests that it is probably related to some manner of

>>> power supply.  However, I have no theory why we're

>>> getting 2x 50Hz (and I think I need one :-)).

>>>

>>

>> Doh!  When the AC wave is rectified, it results in a signal that is 2x

>> the freq. because the negative part gets inverted.  That's why we see

>> 100 Hz instead of 50 Hz.

>>

>> -gabriel

>>

>

> On card A or X?

X.  A has already been "proven" -- unless it's a trick

question that we can't trust that "proof."
> Why AM and not additive signals?
Because the peaks shift with the input signal.  If the

signals were just added (mixed) then the peaks would always

be at 100Hz, 200Hz, 300Hz... etc. and have the same

amplitude.
Try modelling it up with AMS (that's what I did).
-gabriel
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