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Subject: RE: my facts on mics
From: Justin Fisher (JustinF_at_valvesoftware.com)
Date: 2002-10-22


I'm no sound technician, and I inexcusably did not make controlled
recordings before and after for comparison, however, when recording (either
music or from mic) before the mod, things like HDD access created audible
interference, even with the gain right down. Afterwards, if they were still
there, they were below the ambient noise from archos playback and I couldn't
hear it. This was before I switched to Rockbox, which has a lot less ambient
noise during playblack, so I might listen for noise again, but in summary -
it was all most unscientific, but there were positive results.

Since it's a quick and easy mod, I'd encourage someone else to try it, this
time doing it right (making controlled recordings before and after, etc).

I'm a little surprised that more people haven't mentioned interference on
analog line-in recordings - it was fairly noticable in my recordings.
Perhaps archos has improved the shielding since I got mine (about a year
ago).

-----Original Message-----
From: Matthew P. OReilly [mailto:moreilly_at_moreilly.com]
Sent: Monday, October 21, 2002 3:59 PM
To: rockbox_at_cool.haxx.se
Subject: RE: my facts on mics

I have had no problem with mic noise unless I was using the recorder's
internal mic. Did rerouting the wires help with that noise as well, or was
it more EFI noise you were hearing when using an external mic?

Matt

-----Original Message-----
From: owner-rockbox_at_cool.haxx.se [mailto:owner-rockbox_at_cool.haxx.se]On
Behalf Of Justin Fisher
Sent: Monday, October 21, 2002 2:57 PM
To: 'rockbox_at_cool.haxx.se'
Subject: RE: my facts on mics

I think I've noted this before, but I don't imagine everyone saw - I
rerouted the line-in wires in my recorder through the battery compartment,
thus shielding them from the archos circuitry and HDD (the wires are
unshielded and travel the length of the case, right up against the
circuitry). This resulted in the removal of the interference from the archos
operation and disk spins. Hopefully later model recorders have shielded
wires now, but if you can hear interference in your recordings that
corresponds with HDD spins, shielding or rerouting the line-in wires seems
to be an easy and fairly effective fix.



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