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Subject: Recorder noise
From: Björn Stenberg (bjorn_at_haxx.se)
Date: 2002-02-15


I recently got myself a second Archos, a Recorder 20. I figured I should
have both a player and a recorder if we're going to write code for both.

The Recorder is really nice, with much more powerful audio. Unfortunately,
it also has a very faint, but noticeable, noise in the audio output. At
first I didn't think it would bother me, since it isn't noticable while
the music is "normally loud". But I listen movie scores a lot and they
often have long sections of very still and quiet music, in which the noise
is very annoying.

I figured with all the electronics wizards in here, we could perhaps try
and analyze what the noise comes from and if there's something that can be
done about it.

The noise is most apparent during playback (including in paused mode),
possibly due to the VU bars that are updated on the screen. It then has a
oscillating sound at a frequency of maybe 10-15 Hz.

If I bring up the menu or another screen without the VU bars (during
playback), the oscillating stops and there is a instead a steady white
noise.

Stopping playback stops the noise. Also, the noise goes away during disk
access.

Ideas, anyone?

-- 
Björn



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