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Built-In Soundcard, Threat or Menace? (Fran Guidry), ABX RealTek HD
ZinCh
post May 5 2012, 01:48
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Here you can find Article, Setup with pictures, WAV samples for ABX:

http://www.homebrewedmusic.com/2012/05/04/...reat-or-menace/

You can try to ABX before or after reading article:

v.wav
w.wav
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nevermind
post May 7 2012, 00:53
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File v.wav has a constant whining noise throughout, file w does not, As such I would guess v recording as the onboard souncard and the noise to be from the PC supply. There is no point to abx, since the whining is clearly audible at the end (I have heard it in the foobar abx plugin).
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j7n
post May 7 2012, 13:43
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The age when onboard or cheap removable soundcards had bad reproduction quality are long past. As the article correctly pointed to, it's because of features and workflow.

I can connect other devices to a soundcard with the existing stock of cables and don't have to search for adapters. RCA and big TRS connections can take signficantly more abuse. A real soundcard can be direcltly told to run at the sampling rate I want or what an external device is supplying.

While integrated soundcards come with huge software that does nothing, at least not when I want it to. Last time I used an onboard soundcard, its output changed to a microphone and back as I moved the cable, with a loud click, which I found rather disturbing. Bitperfect copies over S/PDIF were impossible, and even they were, the function would probably be burrowed under icons describing "enhanced multimedia experience".
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dhromed
post May 7 2012, 14:28
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QUOTE (nevermind @ May 7 2012, 01:53) *
File v.wav has a constant whining noise throughout, file w does not


What sort of whine? I don't hear a thing.
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dhromed
post May 7 2012, 14:53
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Ok, there are two tones in both files, at 10.7KHz and 15.9KHz, with some slight harmonics above and below.
In v, both are more than 72dB down.
In w, both tones are all but gone.

v also has a slew of other tones and their harmonics at various frequencies. In w these are completely missing.

All four tones are clearly visible in foobar2k's spectrogram after boosting the gain to +45dB (and lowering the output volume to 0, of course happy.gif ).
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moozooh
post May 7 2012, 15:42
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Indeed, "v" has a very clear, immediately obvious high-pitched tone.


--------------------
Infrasonic Quartet + Sennheiser HD650 + Microlab Solo 2 mk3. 
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Arnold B. Kruege...
post May 7 2012, 20:13
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QUOTE (moozooh @ May 7 2012, 10:42) *
Indeed, "v" has a very clear, immediately obvious high-pitched tone.


My FFT analysis says that they both have tones at about 7880 and 15950 Hz, but in V they are about -80 and -78 dB down while in w they are -98 and -96 dB down. The noise floor of V is abut 6 dB higher above 5 KHz. The two noise floors are similar enough to raise some questions in my mind.

The fact that both noise floors are dominated by 120 Hz hum s at similar levels suggests to me that the source of the noise may be other parts of the test environment, perhaps even acoustical noise that is picked up by the mics.
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dhromed
post May 8 2012, 14:49
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Couple o' spectrograms here, of the tracks, boosted by 45dB.

This post has been edited by dhromed: May 8 2012, 14:50
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