[Om2008.9] Using Freerunner as a digital audio player

Sam Kuper sam.kuper at uclmail.net
Mon Oct 13 15:34:44 CEST 2008

2008/10/13 <GNUtoo at no-log.org>
> I was *very* disapointed when I discovered the audio quality via
> headphones:in IRC they told me that it was because the capacitor(that is
> between headphone out and the sound card)'s value was too low and acted as
> a filter...
> As I am too afraid of breaking the openmoko i won't change the capacitor
> myself...but what could I do? build/buy an external amplifier(will it work
> fine?) or find a place where they could remplace me the capacitor?

I wasn't aware of this problem, but if what you are saying is that the
headphone out socket of the phone has a capacitor connected across it that
is attenuating the high frequencies, then an external amplifier connected to
that socket will not be able to restore those frequencies.

A well-designed amplifier that takes a digital audio feed from the USB
socket - a USB soundcard, essentially, would work in principle, but in
practice may be expensive/time-consuming to implement.

My advice would be to try listening to music on your phone. If it sounds
fine, don't worry about it further. If it isn't fine, try using a distro
that is known to have good sound capabilities (someone else mentioned that
Debian gives high playback quality). Only if this fails to give you adequate
quality might it be worth investigating hardware replacements/augmentation.


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