After test, is this bad?

geminni · 2nd May 2007, 09:26 AM

I have been doing some testing with amp. Musci (power) and some sort of simulative osciloscope

with sound card.
The first test was ok for all 4 amplifiers. Those are the same 4 for which i had ground issue but fixed. The power test was fine, the house was shaking and nothing burned out.

Then i put 1Khz square signal to it and recorded it back to computer, I have soundblaster live. And this is the result! I am not so happy with it, it looks like it has some oscilations?

phase_accurate · 2nd May 2007, 09:47 AM

To me this looks like an artefact (i.e. pre-ringinging) of the soundcard.

The reason for my assumption is the fact that usual ringing due to resonances built by parasitic elements shows exponential decaying behaviour - whereas this one is quite the contrary.
So it might arise from the decimating filter that is following the 1-bit delta-sigma converter.

Regards

Charles

geminni · 2nd May 2007, 10:06 AM

Yes, you are right. I'am sorry for this rushing, before i've tested the soundcard

I've put line out to line in, did record and got the same result!

Can i test oscilations with ARTA program?

jaycee · 2nd May 2007, 01:42 PM

Quote:

Originally posted by geminni
I have soundblaster live[/B]

There's the problem

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2nd May 2007, 09:47 AM	#2
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	To me this looks like an artefact (i.e. pre-ringinging) of the soundcard. The reason for my assumption is the fact that usual ringing due to resonances built by parasitic elements shows exponential decaying behaviour - whereas this one is quite the contrary. So it might arise from the decimating filter that is following the 1-bit delta-sigma converter. Regards Charles

2nd May 2007, 10:06 AM	#3
geminni diyAudio Member Join Date: Dec 2006	Yes, you are right. I'am sorry for this rushing, before i've tested the soundcard I've put line out to line in, did record and got the same result! Can i test oscilations with ARTA program?

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