Rockbox mail archive
Subject: Re: digital I/O FAQ - new version
From: Michael O'Quinn (michael_at_oquinn.info)
Every sound man knows to remember his "R"'s: Red-Right-Ring-Return.
Red Color and Right Channel go together.
Ring on a phono jack and Right go together.
Red Color and Return line on the audio snake go together.
The changes about the player look good to me.
I made some suggestions below -- feel free to use or not as you see fit.
Someone asked about getting the raw MP3 data vs. the "usual" PCM on the
digital output, since receivers are starting to appear that can process
the MP3 data directly.
Should that be addressed here?
On Wed, 4 Jun 2003, Andreas Stemmer wrote:
> I checked several web pages and think that tip=left=white is the more
> common pinout. At least all my cables and my headphones are wired this
> btw: sorry for my poor english, I hope it is nevertheless
> understandable. Correct it if necessary.
> Here's an updated version:
> 74. There's a digital I/O connector on my jukebox. What is it good for?
> The recorder and FM recorder models have a connector for digital audio
> output using the common S/PDIF standa1rd (Sony/Phillips Digital
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 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
equipment, you can get much better sound quality out of your jukebox.
This is because you can use better DA-converters and better amplifiers,
plus you eliminate the analog audio connections between the jukebox and
your equipment that can introduce noise and distortion.
[split sentence - makes the English flow better]
[added a bit more info]
> recorder (not the FM recorder) is able to record from digital sources,
> too. 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!
Although S/PDIF can be an electrical or an optical signal and there are
many devices that support both, the socket on the jukebox is for
electrical signals only! Some devices have sockets that look the same,
and can take either an optical or an electrical cable, but sadly this
is not true with the Jukebox.
[Re-wrote for greater clarity]
> 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 on the Jukebox, since it's always on.
[added a bit to make it more clear]
> 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
[added exclamation point]
> 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).
optical (for digital output from the Archos) or optical to electrical (for
digital recording in to the Archos).
[clarified a bit]
[removed "respectively" which didn't quite work there]
> Note that there exist some adapter cables with different color coding,
> so if output doesn't work the red jack try the white RCA jack, too. The
> tip of the 3.5mm jack is the digital input, the ring is the ouput.
Page was last modified "Jan 10 2012" The Rockbox Crew