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Old 28th March 2013, 06:48 PM   #1091
Waly is offline Waly  United Kingdom
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Quote:
Originally Posted by BV View Post
L22, same conditions..
Less noisy, as expected and already mentioned. You would think it's worth the money?

A brand new in box of mine just went on EBay UK for the stunning price of... 38 squid . Of course, if one already owes a L22, there's little reason to look for anything else. Otherwise, as a hobbyst, to buy a new LynxTwo or L22 today you have to be either a snob, or equally rich and stupid.

Last edited by Waly; 28th March 2013 at 06:57 PM.
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Old 28th March 2013, 11:48 PM   #1092
Bonsai is offline Bonsai  Taiwan
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The problem with ALL these damn sound cards, is the only decent ones are the ones that slot into a motherboard. I want this performance on a USB line input level unit. I tried a few(EMU, etc). All crap. But, just for doing comparative measurements, I suppose they will do. Maybe we could stop throwing eggs at each other and design a really good stand lone card. .
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Old 29th March 2013, 05:49 AM   #1093
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Thanks for the info on FFT. Those are some very helpful references.
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Old 29th March 2013, 05:56 AM   #1094
jcx is offline jcx  United States
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The problem with ALL these damn sound cards, is the only decent ones are the ones that slot into a motherboard. I want this performance on a USB line input level unit. I tried a few(EMU, etc). All crap. But, just for doing comparative measurements, I suppose they will do. Maybe we could stop throwing eggs at each other and design a really good stand lone card.
I think Twisted Pear are working on ESS ADC too

but maybe non ESS parts would be preferable for a "open" design
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Old 29th March 2013, 11:18 AM   #1095
BV is offline BV  Slovakia
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2 Waly
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you have to be either a snob, or equally rich and stupid.
Try something like this (analogue loopback, BW10kHz) with your card..And more than ten years ago.
"We are not so rich to buy cheap things.."
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Old 17th April 2013, 09:25 AM   #1096
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And this is what can be achieved with my distortion analyzer and 10 years old sound card:
Test signal: 19201Hz, BW: 250kHz, measurement floor < -160dB. Harmonics are around 2ppb. I wonder if this is possible with a Xonar Essence, despite its gold plated bracket.
(NB: All done in software; no analog distortion magnifier or notch filter has been used.)
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File Type: png THD-19k3-9h-pp.png (23.6 KB, 215 views)
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Old 17th April 2013, 10:07 AM   #1097
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Edmond, I know I asked before but I still don't get how you are able to generate a 19 kHz test tone with -160 dB harmonics in a 250 kHz bandwidth. With the sound card? How????
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Old 17th April 2013, 10:54 AM   #1098
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Hi Harry,

I don't generate a 19 kHz test tone with -160 dB harmonics, instead, the measurement floor of the whole setup is 160dB down. How? Sorry, I can't tell because of commercial interest. The same applies to that 250kHz bandwidth, which, btw, is not the BW of the sound card (normally Fs/2), rather a constraint imposed by the software.
(The 'software' BW is much higher than Fs/2. Hint: think of undersampling).

Cheers,
E.
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Old 17th April 2013, 11:21 AM   #1099
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Quote:
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Hi Harry,

I don't generate a 19 kHz test tone with -160 dB harmonics
Then I obviously don't understand what you mean by:

Quote:
Originally Posted by Edmond Stuart View Post
Test signal: 19201Hz, BW: 250kHz … Harmonics are around 2ppb
Or your screenshot showing a sinewave and a measurement reading that states "THD = -168.2 dB"

Where is that sinewave coming from?
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Old 17th April 2013, 11:30 AM   #1100
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Hi Harry,

The screenshot shows what you get if the DUT produces zero distortion.

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E.
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