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Subject: Re: new FAQ entry: digital I/O not working

Re: new FAQ entry: digital I/O not working

From: BlueChip <>
Date: Tue, 03 Jun 2003 18:32:46 +0100

Yes, from someone who has had a digital I/O problem - your FAQ entry would
have stopped me from asking here :)

I think Michaels comments are also valid, and I would like to add a small
snippet of my own ..I know that it effectively just repeats the S/PDIF
info, but for less technical people:

my 2 cents...
Some amplifiers support MP3 decoding. With the Archos you must *disable*
this feature of the amp, and use "PCM" mode. This is because the Archos
has already decoded the MP3 for you.
-and either-
The Archos *can* send an MP3 encoded signal, but this feature is not yet
supported by Rockbox.
Due to hardware constraints, the Archos *cannot* send an MP3 encoded signal
- the signal from the Archos is *always* decoded BEFORE it gets to the


At 09:41 03/06/03 -0700, you wrote:
>Makes sense to me.
>Note that the Players don't have a S/PDIF jack, however.
>The Recorder and FM Recorder have a connector for digital audio output
>using the common S/PDIF standard (Sony/Phillips Digital Interface). This
>jack is not present on the Studio/Player models. By using the digital
>output in combination...
>On Tue, 3 Jun 2003, Andreas Stemmer wrote:
> > I know this is not really a rockbox related topic, but there are
> > frequent questions about the digital I/O. Perhaps we should add this to
> > the faq:
> > (Feel free to change anything if there's something missing/wrong/badly
> > verbalised)
> >
> > Question:
> > 74. There's a digital I/O connector on my jukebox. What is it good for?
> >
> > Answer:
> > All jukebox models have a connector for digital audio ouput using the
> > common S/PDIF standard (Sony/Phillips Digital Interface). By using the
> > digital output in combination with high class external equipment, you
> > can get much better sound quality out of your jukebox, because you can
> > use better DA-converters and better amplifiers. The recorder and FM
> > recorder models also can record from digital sources. The digital inputs
> > don't have the 15kHz lowpass filter like the analog inputs and you are
> > sure to minimize the noise floor.
> > Generally, S/PDIF can be an electrical or an optical signal and there
> > are many devices that support both. There are even small 3.5mm sockets
> > that can take either an optical or an electrical cable. But the socket
> > on the jukebox is for electrical signals only!
> > If you want to connect your amp with digital input (RCA type) to the
> > output of your jukebox you need an adapter cable (3.5mm stereo jack to
> > dual RCA jack). Plug the 3.5mm stero jack into the digital I/O socket of
> > your jukebox and the red RCA jack (right channel) into the digital input
> > socket of your amp and that's it. You don't have to enable the digital
> > output. The sound settings on the digital output are always flat, your
> > volume, bass, treble, bass boost, loudness settings won't have any
> > effect here.
> > For recording digital signals, use the white RCA jack (left channel) and
> > plug it into the digital output of your CD player, MD player or
> > whatever. Don't forget to select digital input in the recording
> > settings.
> > If you want to connect devices with optical inputs/outputs, you need a
> > small converter box which converts your signal from electrical to
> > optical (for digital output) respectively optical to electrical (for
> > digital recording).
> >
Received on 2003-06-03

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