Re: New page on using (Linux) computers for audio.

On Wed, 24 Jun 2009 09:05:40 +0100, Jim Lesurf <noise@xxxxxxxxxxxxxxx>
wrote:

In article <u8e245104f4hfj78ape4abi10h1uqlmo4h@xxxxxxx>, Chris Isbell
<chris217_NOSPAAM@xxxxxxxx> wrote:
On Sun, 21 Jun 2009 17:16:23 +0100, Jim Lesurf <noise@xxxxxxxxxxxxxxx>
wrote:

Hi,

I've just put up a new page at

http://www.audiomisc.co.uk/Linux/Sound1/SoundComputing.html

which gives the results of some of my recent experiments on seeing how
to use a couple of Linux computers as machines for playing sound files.

It is possible to run the RightMark Audio Analyzer (as recommended by
Arny Krueger) on Ubuntu Linux using Wine. (http://audio.rightmark.org/)

No idea. I did the measurements using the methods I've developed for my own
use. However since my interest was in examining what actually emerged from
the digital or analogue sockets of the machine, that involved me using
external equipment to capture the results. I was not measurering any
'internal' data streams.

I successfully ran this against my Edirol UA-25 USB sound module. It
seems, to my relatively non-expert eye, to be quite useful for analysing
computer sound systems.

How would you check that, say, the spdif output of the machine was
bit-perfect?, Or check to see if soundcard hardware was altering the data
stream being sent to it? The potential problem here is that the stream of
values sent to the soundcard hardware might not be the same as it outputs
from the machine.

Also, if someone uses Wine, how would they check to see if that was
affecting the results being fed out to the Linux stream?

The point of my tests was to see how some Linux systems (i.e. the complete
combination of software/OS/hardware) worked when asked to provide sound
output from defined source material. Then to see if it was possible to
optimise this. Hence my focus on the actual output which would then be fed
to a hifi system.

Slainte,

Jim

The usual method with Rightmark is loopback - outputs to inputs - of
the sound card. OK, if the conversion accuracy is about the same both
ways, this will probably end up with a result that is 3dB pessimistic
for noise and distortion, but it will certainly separate the good from
the bad.

d
.

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