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Andreas Stemmer's entry 74 on digital I/O added

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@3728 a1c6a512-1295-4272-9138-f99709370657
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Daniel Stenberg 2003-06-04 20:36:47 +00:00
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docs/FAQ
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@ -676,3 +676,46 @@ A73: Yes, the recorder can crash when you copy several gigabytes of
* Use USB 2.0. Transfers will be much faster.
* Copy incrementally. With fully charged standard batteries it
should be capable of sustained copying for 2 - 2.5 hours.
Q74: There's a digital I/O connector on my jukebox. What is it good for?
A74: The Recorder models 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/FM Recorder 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.
The Recorder and the FM Recorder models are 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!
If you want to connect your amp with digital input (RCA type) to the
output of your Recorder 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 on the Recorder, 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. 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.
For recording digital signals on the FM Recorder, you need a special
4-pole 3.5mm plug (shaft = ground, tip = left channel analog line in,
first ring (next to tip) = right channel analog line in, second ring =
digital in).
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).