Re: [LAD] A little quiz about audio measurements...

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To: <linux-audio-dev@...>
Date: Friday, May 28, 2010 - 6:34 pm

On Fri, 28 May 2010 13:23:21 -0500 (CDT)
"Gabriel M. Beddingfield" wrote:

>

OK, had a bit more of a think.

Once you connect the analogue side of the the USB device to the
installed (high quality card) you have an earth loop that traverses
both the analogue and digital domains. You also have an +5V loop (unless
the USB device is externally powered) This loop does not exist when the
USB card is self testing. I still can't think exactly how, but I
believe this is likely to be a significant part of the problem.

--
Will J Godfrey
http://www.musically.me.uk
Say you have a poem and I have a tune.
Exchange them and we can both have a poem, a tune, and a song.
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Messages in current thread:
Re: [LAD] A little quiz about audio measurements..., Niels Mayer, (Fri May 28, 3:31 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 5:00 pm)
Re: [LAD] A little quiz about audio measurements..., Karsten Wiese, (Sun May 30, 2:06 pm)
Re: [LAD] A little quiz about audio measurements..., Karsten Wiese, (Sun May 30, 4:08 pm)
Re: [LAD] A little quiz about audio measurements..., Niels Mayer, (Fri May 28, 6:27 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 6:39 pm)
Re: [LAD] A little quiz about audio measurements..., Veronica Merryfield, (Fri May 28, 7:14 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 7:17 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 9:24 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 10:33 pm)
Re: [LAD] A little quiz about audio measurements..., Veronica Merryfield, (Sat May 29, 1:59 am)
Re: [LAD] A little quiz about audio measurements..., Gene Heskett, (Fri May 28, 11:56 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Sat May 29, 6:30 am)
Re: [LAD] A little quiz about audio measurements..., Veronica Merryfield, (Sat May 29, 6:42 am)
Re: [LAD] A little quiz about audio measurements..., Gene Heskett, (Sat May 29, 3:58 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Sat May 29, 7:14 am)
Re: [LAD] A little quiz about audio measurements..., Gene Heskett, (Sat May 29, 4:19 pm)
Re: [LAD] A little quiz about audio measurements..., Jens M Andreasen, (Sun May 30, 5:29 am)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Sun May 30, 11:05 am)
Re: [LAD] A little quiz about audio measurements..., Jens M Andreasen, (Sun May 30, 12:29 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Sun May 30, 12:35 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 10:42 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 6:30 pm)
Re: [LAD] A little quiz about audio measurements..., Gabriel M. Beddingfield, (Fri May 28, 5:40 pm)
Re: [LAD] A little quiz about audio measurements..., James Morris, (Fri May 28, 6:28 pm)
Re: [LAD] A little quiz about audio measurements..., Veronica Merryfield, (Fri May 28, 6:15 pm)
Re: [LAD] A little quiz about audio measurements..., Gabriel M. Beddingfield, (Fri May 28, 6:23 pm)
Re: [LAD] A little quiz about audio measurements..., Folderol, (Fri May 28, 6:34 pm)
Re: [LAD] A little quiz about audio measurements..., Gabriel M. Beddingfield, (Fri May 28, 6:40 pm)
Re: [LAD] A little quiz about audio measurements..., Jens M Andreasen, (Fri May 28, 7:12 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 6:50 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 6:52 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 6:26 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 6:22 pm)
Re: [LAD] A little quiz about audio measurements..., Jens M Andreasen, (Fri May 28, 5:58 pm)
Re: [LAD] A little quiz about audio measurements..., Gabriel Beddingfield, (Fri May 28, 5:50 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 5:57 pm)
Re: [LAD] A little quiz about audio measurements..., Gabriel M. Beddingfield, (Fri May 28, 6:08 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 6:18 pm)
Re: [LAD] A little quiz about audio measurements..., Arnold Krille, (Fri May 28, 5:24 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 4:33 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 4:39 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 3:24 pm)
Re: [LAD] A little quiz about audio measurements..., Robin Gareus, (Fri May 28, 3:05 pm)
Re: [LAD] A little quiz about audio measurements..., Veronica Merryfield, (Fri May 28, 5:00 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 5:21 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 5:37 pm)
Re: [LAD] A little quiz about audio measurements..., Robin Gareus, (Fri May 28, 3:39 pm)
Re: [LAD] A little quiz about audio measurements..., Veronica Merryfield, (Fri May 28, 6:55 pm)
Re: [LAD] A little quiz about audio measurements..., Ricardus Vincente, (Fri May 28, 7:15 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 7:20 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 7:07 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 7:14 pm)
Re: [LAD] A little quiz about audio measurements..., Robin Gareus, (Fri May 28, 5:22 pm)
Re: [LAD] A little quiz about audio measurements..., Jens M Andreasen, (Fri May 28, 8:52 pm)
Re: [LAD] A little quiz about audio measurements..., Jens M Andreasen, (Fri May 28, 9:34 pm)
Re: [LAD] A little quiz about audio measurements..., Jens M Andreasen, (Fri May 28, 10:31 pm)
Re: [LAD] A little quiz about audio measurements..., Florian Faber, (Fri May 28, 4:54 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 5:04 pm)
Re: [LAD] A little quiz about audio measurements..., Chris Cannam, (Fri May 28, 2:53 pm)
Re: [LAD] A little quiz about audio measurements..., Ralf Mardorf, (Fri May 28, 3:05 pm)
Re: [LAD] A little quiz about audio measurements..., Robin Gareus, (Fri May 28, 3:27 pm)
Re: [LAD] A little quiz about audio measurements..., Gene Heskett, (Fri May 28, 2:37 pm)
Re: [LAD] A little quiz about audio measurements..., Florian Faber, (Fri May 28, 1:35 pm)