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rockbox/docs/FAQ
Daniel Stenberg c4ac99c38b Introducing entry 75. How to unsubscribe. 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@3989 a1c6a512-1295-4272-9138-f99709370657
2003-10-27 07:15:56 +00:00

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Q1. What is a FAQ?
A1. A rare small animal of the species 'Textius Electronicus'. It is known for
its helpful attitude and vicious misspellings.
Q2. Okay, fine, what is _this_ FAQ?
A2. This FAQ is for questions (that we have answers to) that have been asked
repeatedly either in emails or on IRC.
Q3. What is Rockbox? What is it's purpose?
A3. The purpose of this project is to write an Open Source replacement
firmware for the Archos Jukebox 6000, Studio 20 and Recorder MP3 players.
Q4. I want to write code for my Archos, how do I proceed?
A4. Our guide on first time (http://rockbox.haxx.se/docs/firsttime.html)
Rockbox development should answer most of your questions.
Q5: What is CVS?
A5: Concurrent Versions System (http://www.cvshome.org). We have a small
help page about how to use this to get, update and commit files on the web
at http://rockbox.haxx.se/cvs.html
Q6. What exactly is the CONTRIBUTING file?
A6. Just like the name implies, it lists conventions that the project follows,
and in turn asks you to follow, for the formating of source code in
general.
Q7. Okay, so I read CONTRIBUTING and although I don't agree with all your
conventions, I am going to be sensible and follow them anyway. Now what?
A7. Start by reading up on the information about the jukeboxes on our web page.
Then go into CVS and look at the code we've written. Then take what you
need and start writing.
Q8. I want to join the development team, but don't have a SourceForge account,
what should I do?
A8. You don't need a SourceForge account to help developing Rockbox. Just
submit patches (http://rockbox.haxx.se/docs/patch.html)
If your patches are consistently well-written and thus accepted, you may
ultimately be offered CVS commit access. If that should happen, you will
need to get a Sourceforge account:
http://sourceforge.net/account/register.php
Q9. Do you have a mailing list?
A9. Sure do! As a matter of fact, we have several of them for specific things.
Please check out: http://rockbox.haxx.se/mail/, and please see FAQ entry
75.
Q10. Great you have a mailing list! Is there anyway for me to catch up on
past posts?
A10. Check out the archives at: http://rockbox.haxx.se/mail/
Q11. How can I meet the developers working on the project?
A11. One way is by visiting us on IRC. Head on over to the server
irc.openprojects.net, and then join "#rockbox". There is usually at
least one person there. If you don't see any activity, feel free to post
questions anyway, several of us log the channel and will get you answers
when we unidle.
Q12: Wow, you guys talk on IRC a lot? I wish I had been around for those
conversations to see what happened.
A12: We are glad you mentioned that! http://rockbox.haxx.se/irc happens
to have a list of various logs we have recorded of events in the channel.
Feel free to read up, and ask questions on what you find.
Q13. What is this "SourceForge" you keep mentioning?
A13. http://www.sourceforge.net
Q14. Can the changes or the software that Rockbox suggests or offers
possibly damage my Archos Player?
A14. All firmware mods that are presented are still highly experimental.
Try them at your own risk. We offer no guarantee that this software, or
the hardware modifications we show, will not damage your player or void
your warranty. That said, we have not been able to damage any of our
units by modifying only the firmware. You can accidentally password
protect your hard disk, but there are ways around that. (See below.)
Q15. I want to see what the inside of my player looks like, but I would really
like to avoid voiding my warranty. Is there anything you can suggest?
A15. We have a collection of photos of both the player and recorder. Look at
http://rockbox.haxx.se/internals/
Q16. What exactly are you trying to achieve with this line of development?
(A.K.A. what's your purpose for being here?)
A16. Firstly, we wouldn't start something like this if we didn't simply enjoy
it profusely. This is great fun!
Secondly, we feel the firmware is lacking some features and contain a
number of annoying bugs that we want to fix.
Some ideas would include (in no particular order):
- No pause between songs
- Mid-song resume
- Mid-playlist resume
- No-scan playlists
- Unlimited playlist size
- Autobuild playlists (ie: "all songs in this directory tree")
- Auto-continue play in the next directory
- Current folder and all sub-folder random play
- Full disk random play
- REAL random
- Multi song queue
- Faster scroll speed
- More cool features with the wire remote control (including
controlling your Archos from your car radio (req hw mod))
- Support playing of other files types (ie: Ogg Vorbis support)
- Support for megabass switch (req hw mod)
- Player control via USB
- Memory expansion?
Note: Just because something is on this list, does not mean that it is
technically feasible. (But hey we can dream) And something not
being on the list does not mean it isn't a neat idea. Bring it to
the list.
Q17. You mention supporting Ogg Vorbis and other file types on your list of
ideas. What is the status on that?
A17. Pessimist's Answer: At the current time we believe this is not very
likely. The Micronas chip (MAS3507) decoder in the Archos does not
natively support decoding and there is very little program space in the
player to implement it ourselves. The alternative would be to write a
software decoder as part of the Rockbox firmware. However, as much as we
love our players, the computing power of the Archos (SH1 microcontroller)
is not fully sufficient for this need.
Optimist's Answer: We can play any format if only we can write code for
the DSP to decode it. The MAS 3507 (and 3587) are generic DSPs that
simply have MP3 codecs in ROM. We can download new codecs in them and
we will be the first to celebrate if we can get OGG or FLAC or anything
into these DSPs. Unfortunately, we have no docs or tools for writing new
MAS DSP code and Micronas is very secretive about it. If anyone can
help, please get in touch!
The recent release of Tremor (integer Ogg decoder) indicates it uses
around 100 KB for lookup tables. That's not unreasonable for a decoder,
but we only have 4 KB for both code *and* data. So the grim reality is
that Ogg will never be supported by the Archos Players and Recorders.
Q18. What about supporting playing of WMA files?
A18. Dear Mr. Gates, you have two options. Re-read previous question, or go
buy your own project.
Q19: But you don't understand, I'm not talking about decoding here,
since the data we want may already be in the decoded format (PCM).
A19: Okay, last time. No. We have no problems whatsoever reading different
file formats, call it PCM, WAV, GRI, PQR or whatever. The problem is
that the CODEC only accepts MP3 data and nothing else. We could write a
new CODEC if we knew how to do it, but there is no documentation on the
DSP. Please note that we have no access to the DAC, so we can't send the
data directly to the DAC.
Q20. What is the most recent version of Rockbox?
A20. We recently released version 2.0, so head on over to
http://rockbox.haxx.se/download/ and pull it down.
Make sure to read the release notes.
(http://rockbox.haxx.se/download/rockbox-2.0-notes.txt).
Q21. What do you plan to add to coming versions?
A21. We have a rough idea of which features we plan/expect/hope to be included
in which versions. Once again, remember that none of this is written in
stone (noticing a pattern yet?)
Version 2.1
Lots of features and fixes that were held off for 2.0
Version 2.2
User interface overhaul
Version 2.3
Plugin loader, opening the door for a bucketful of new applications
Q22. I tried one of your firmware files and now I can't access my hard disk!
When I turn on my jukebox, it says:
Part. Error
Pls Chck HD
A22. Your hard disk has been password protected. We're not 100% sure why it
happens, but you can unlock it yourself. Look at:
http://rockbox.haxx.se/lock.html
Q23: This FAQ doesn't answer the question I have. What should I do?
A23: You have a couple options here. You could forget the question, find an
easier question, or accept '42' as the answer no matter what. We don't
really recommend any of these (though I do opt for '42' often myself).
What we do recommend is stopping by IRC, visiting the web site
(http://rockbox.haxx.se) to see if the question was answered else where
(like our nodo http://rockbox.haxx.se/docs/nodo.html FAQ) and just not
included here, or ultimately dropping an email to the mailing list
(rockbox@cool.haxx.se) or the FAQ maintainer listed on the project home
page.
Q24: Are there other ways to contact the developers?
A24: Yes.
Q25: Are you going to tell us what they are?
A25: No. Post to the mailing list and we will get back to you.
Q26: But I _really_ want to talk with you in person.
A26: I'm sorry. My girlfriend/boyfriend/pet says I'm not allowed to, and the
doctors here won't let me have pens or pencils. They say its some rule
about us not having sharp objects. I'm sorry. Now please stop calling
me here.
Q27: Will you ever port Quake II to the Archos?
A27: If you ask that again, I'm sending your address and phone number to the
guy that mailed us with question #24.
Q28: Umm, was that sarcasm?
A28: That's it, I'm mailing him now.
Q29: Is this legal? I mean, I'd just hate to see something like that
challenged under the DMCA in all its ridiculousness. Any thoughts or
ideas?
A29: We believe we are in the green on this. We are not violating anyone's
copyright and we are not circumventing any copy protection scheme.
This has been a big point for the project since its inception. Some
people wanted us to distribute patched versions of the original firmware,
but seeing as that _would_ have violated Archos' copyright, we didn't
follow that course of action.
Q30: On the web site [and various information postings] you state
"Every tiny bit was reverse engineered, disassembled and then
re-written from scratch".
If it was rewritten from scratch then why was it first reverse-engineered
and disassembled? Instead this sounds more like someone disassembled it
then used the understanding that they gained to create a new version,
which is not quite the same as "from scratch".
A30: Don't confuse the terms. Reverse engineering means examining a product
to find out how it works. Disassembling the firmware is merely one tool
used in that examination. Oscilloscopes and logic analyzers are other
tools we have used. We have written every single byte of the Rockbox
firmware. But we could not have written the software without first
researching how the hardware was put together, i.e. reverse engineer it.
All of this is completely legal. If you define "from scratch" as writing
software without first researching the surrounding interfaces, then no
software has ever been written from scratch.
Q31: Wait a minute here. When you released version 1.0 you did not have a
single one of the ideas you have mentioned on your web site actually
implemented! Calling this version 1.0 is really misleading. What's the
story?!
A31: In simple terms, the first release was called 1.0 because it had a basic
working feature set that worked and had no known bugs. That is what 1.0
meant. It is true that Rockbox 1.0 lacked most of the feature set that
every sane user wanted. However, we never said it was more
feature-complete or better in any way then the original firmware that
early in the project. The first release was done as a proof of concept
that our ideas are moving in the right direction. We also hoped that it
would help bring the project some attention, and some additional
developers. Adding the missing features was just a matter of time. In
more recent releases we have completed many of our desired goals, and
several new ones that were implemented to fulfill user requests.
Q32: I've heard talk of a 'Rolo'. What is that? (Or 'All you ever wanted
to know about Rockbox boot loaders')
A32: Rolo is our bootloader. Rolo became available with our 1.4 release.
To make use of Rolo, you must have a file with the same extension as
your Rockbox firmware (.ajz on Recorder, .mod on Player) but a different
name. You can then browse to it, and you 'run' the other firmware
you wish to switch to by pressing play. Remember to set the Show Files
option to "Supported" or "All" to be able to see the firmware files in
the browser.
*Poof* You will reboot to that firmware. (Note that in order to return
to Rockbox you may need to reboot manually if the new firmware you loaded
does not have a bootloader itself.)
Q33: Can I use the Archos as an USB hard disk to store data from my PDA/
digital camera/phone etc.
A33: No. See: http://rockbox.haxx.se/docs/nodo.html#4
Q34: When I use Rockbox my jukebox's red "error" light turns on a lot, but this
doesn't happen on the factory firmware. Why?
A34: Rockbox uses the red LED as harddisk activity light, not as an error
light. Relax and enjoy the music.
Q35: I have a question about the batteries...
A35: STOP! We have put together a completely different FAQ for battery
related questions.
Check out: http://rockbox.haxx.se/docs/battery-faq.html
Q36. I have a question about patches...
A36. Check out http://rockbox.haxx.se/docs/patch.html as it should answer any
patch related questions you may have.
Q37: What is the WPS?
A37: That is the 'While Playing Screen'. Basically this is what is shown on
your player's display while we are playing your song.
Q38: What good is the WPS? How usable/flexible is it?
A38: It is very good if you want information about the current item playing ;)
By using a WPS configuration file you can manage exactly how/what you
want displayed on your Archos Player. (Even better yet, if you want
a feature that's not there, we are _always_ open to suggestions!)
Please see http://rockbox.haxx.se/manual/wps.html for information.
Q40: So how do I load/make a .wps file?
A40: You check out http://rockbox.haxx.se/docs/custom_wps_format.html to learn
the format/features of a .wps file, and you visit
http://rockbox.haxx.se/manual/wps.html to learn how to load it ;)
Q41: Does Rockbox support other languages? How do I load/use different
languages?
A41: See: http://rockbox.haxx.se/lang
Q42: Does Rockbox support other fonts/character sets?
A42: Recorders do, Players don't.
Q43: How do I use the loadable fonts?
A43: If you own a Recorder see: http://rockbox.haxx.se/fonts/ Players
cannot make use of loadable fonts.
Q44: Why can't I use loadable fonts on the Player?
A44: This is because the Player font is character cell based (as opposed to
the Recorder's bitmap based display). This
means that we are able to choose what characters to display, but not how
to display them. We do have the ability to change/create up to 4 chars
on one model and 8 on another, however we are currently using several of
these 'letters' to store icons for the player.
Q45: Why don't you have any games available for the Players?
A45: The display on the Players is character cell and not bitmap based.
This means we can only control what characters get displayed, not
what pixels are shown. This makes the prospect of game play very
slim (at least for anything involving graphics, so if you have text
based games that only use 2 lines send them on in!).
Q46: I keep shutting off my player in my pocket. Can the OFF (Recorder) or
STOP (Player) key be locked?
A46: No. Unfortunately, the ON/OFF mechanisms are handled entirely in
hardware. The firmware can read the keys, but can't prevent them from
shutting off the player.
Q47: Where's the recording option? Why can't I record?!!
A47: I'd like to say we hid it because we don't like you, but you seem to be
a good person so here's the truth. It's just not implemented in release
versions of Rockbox yet. But stress not, you can still use Rolo to boot
the default Archos firmware and record from there. (In order to do this
you _must_ have a copy of the original firmware still on your player)
Daily builds and bleeding edge versions have initial support for
Recording. If you're brave and want to help out, get one, try out and
report your findings!
Q48: When recording is finally implemented in Rockbox, will it be possible to
use custom codecs (like LAME) or is there a built in codec in the Archos?
A48: The MP3 encoder is in the MAS3587F chip, and nothing we can change.
Q49: What are the max/min bitrates for recording on the Recorder's encoder?
A49: The builtin encoder is variable bit rate only with a max of 192kbit/s,
and a min of 32kbit/s.
Q50: Would it be possible to record from line in on the player?
A50: No.
Q51: I have a question about the id3v1 and id3v2 tags...
A51: Stop! Here is all the information about that (if you still have
questions when done, ask then.)
- Rockbox supports both id3v1 and id3v2
- The id3v2 support is limited to the first 300 bytes of the file. Some
ripper programs tend to add very big tags first and then the important
ones Rockbox wants to read end up beyond the first 300 bytes and then
they remain unknown.
- If you believe that the tags you don't see *are* within 300 bytes, then
please make the mp3 file available for one of the developers to try out.
- The 300-byte limit is subject to be removed in a future version
(Actually, it was removed in post-1.4 versions)
Q52: Where exactly did the name 'Rockbox' come from?
A52: Well you can follow the full line of emails at
http://rockbox.haxx.se/mail/archive/rockbox-archive-2002-01/0062.shtml
However, the brief rundown is that it was recommended first by
Tome Cvitan, and put to a vote (which it lost).
Funny thing about democracies. This isn't one ;) Our beloved project
leader vetoed the winning name and chose Rockbox instead.
http://rockbox.haxx.se/mail/archive/rockbox-archive-2002-01/0134.shtml
There you have it. Recommended by users, decision by dictator.
Q53: Why is there a limit of 400 files in a directory?
A53: We have answered this question numerous times. It is mentioned in the
release notes, and in the mailing list archives
(http://rockbox.haxx.se/mail/archive/rockbox-archive-2002-08/0448.shtml).
But, hey, we wouldn't want people to have to work to get an answer.
(If you are reading this, feel proud, for you are the exception).
We settled on 400 files in a directory because file listings take up
memory on the unit, and we felt that 400 is significantly large enough
for a majority of the populace. We prefer the option of limiting
file limits in order to provide a greater amount of memory for buffering
of files being played.
Newsflash! This limit is now configurable in the daily (post-2.0) builds.
Q54: Okay, I understand your 400 file limit. But why hardcode? Why not
have this be dynamically allocated?
A54: Because it's useless. Dynamic memory is only ever useful if you have
memory consumers (tasks) that run at different points in time, and thus
can reuse the same memory for different purposes.
We don't have that. We must be able to show a big dir, index a big
playlist and play a big mp3 file, all at the same time. They cannot use
the same memory, and thus dynamic memory buys us nothing but extra
complexity. If we used dynamic memory for this, we would get all kinds
of odd bugs. Playlists that only got half-loaded if placed in certain
directories. Parts of the disk you couldn't go to if playing a certain
playlist etc.
We have a number of tasks that consume memory. They can all run at the
same time, using all of their allotted memory. Therefore it is much better
to allocate that memory to them beforehand and not pretend that anyone
else is able to use it. This is standard practice in memory-limited
systems.
Newsflash! This limit is now configurable in the daily (post-2.0) builds.
Q55: Why is there a 10,000 song limit on playlists?
A55: This is another hardcoded limit. We feel that as bigger disks arrive
that this limit will increase. Because of the way that playlists are
stored, it tends to be a bit more malleable than the directory file limit.
For further detail, look at questions 53 and 54 and replace any instances
of '400' with '10,000'.
Newsflash! This limit is now configurable in the daily (post-2.0) builds.
Q56: You don't understand! I _really_ need to have more then 400 files
in a directory!
A56: The use of really big directories was a workaround for the poor playlist
capabilities of the original Archos firmware. With Rockbox, you no longer
need this workaround. Organize your files in directories, then build
playlists for all collections you want to shuffle-play.
Newsflash! This limit is now configurable in the daily (post-2.0) builds.
Q57: How can I make playlists on my PC?
A57: There are many programs that can create .m3u playlists. WinAmp is one.
Another simple method, that requires no extra software, is to use dir:
dir /b /s X:\ > X:\allfiles.m3u
dir /b /s X:\Pop > X:\pop.m3u
...where X: is your Archos drive.
Linux users can use the 'find' command:
cd /mnt/archos
find . -name "*.mp3" > all.m3u
Remember that playlists are simple text files. You can edit them with any
normal text editor.
Q58: How does the shuffle work?
A58: It sees the playlist as a deck of cards, shuffling the entries using a
pseudo-random generator called the Mersenne Twister. After shuffling,
the list is never changed again until you re-shuffle the list, by
stopping the playback and restarting. If the repeat mode is enabled,
the list will simply start over from the first file again, without
re-shuffling.
The random seed is stored in the persistent setting area, so that the
resume feature can shuffle the playlist in exactly the same way when
resuming.
Q59: How can I find out about all the neat features that Rockbox has?
A59: This information is in our manual (It sometimes gets a bit out of
date, so please bear with us.) The information you are most likely
looking for is a bit down the tree, so the here is the url:
http://rockbox.haxx.se/manual/rec-general.html
Also, check out the features-list at:
http://rockbox.haxx.se/docs/features.html
Q60: How can I see what bugs are currently open/being worked on?
A60: Check out http://rockbox.haxx.se/bugs.shtml for a listing of bugs
that have been reported.
Q61: How can I report about bugs in Rockbox?
A61: If we were better programmers we would take that as an insult. But we
aren't, so we won't. The first step in reporting a bug is to review
the rules we ask you to follow in your submission (listed at:
http://rockbox.haxx.se/bugs.shtml#rules).
Please note that we ask reports of bugs in CVS/daily builds to be sent
to the mailing list, and bugs in released versions of Rockbox to be
submitted through SourceForge's bug tracker. (A link to the bug tracker
can be found under our bug submission rules.)
Q62: What's with all the different versions of Rockbox?
A62: There are really only two versions of Rockbox. One for Players and one
for Recorders. However, we do have 3 other 'versions' of Rockbox
available for download. These would be Releases, Daily Builds, and
Bleeding Edge.
The Release version (currently 2.0) has a fixed feature set. This means
that we are confident that few, if any, significant bugs still reside
within the code/features of that 'version'. This is the version for the
common user.
The Daily Builds (see: http://rockbox.haxx.se/daily.shtml#target_builds)
are automated daily builds of the CVS code. As such they contain all
the new features (and bugs ;) ) that have been introduced after the
last official release, and upto and including that morning.
The Bleeding Edge 'versions' are automated builds that are updated
every 20 minutes or so. This are as feature full and bug ridden as you
can possibly get if you are not a developer, or are not pulling directly
from the CVS tree.
Please Note: Daily and Bleeding Edge builds are expected to be buggy.
We ask that you _do not_ submit bug reports for Bleeding Edge versions,
but would love to hear any reports you may have about Release or Daily
build versions. (see "How can I report about bugs in Rockbox?")
Q63: I am in Windows and can't create a .rockbox directory to store my
files. When are you going to fix this?
A63: We won't. The limitations of your operating system is not reason
enough for us to change how we handle things. And you _can_ create
this directory. Open a command line and type:
mkdir j:\.rockbox
You will need to correct the location for the drive letter that Windows
assigns to your drive.
Q64: I own a Mac. I can't seem to create the .rockbox file. Can you
fix this?
A64: Truth is, we don't need to fix anything. If you are using OSX then you
can just open a console, change directories to the device and just:
mkdir .rockbox
If you are in another version then you should be able to do command-N in
the Finder, then name the folder.
Q65: Will Rockbox work on any of Archos' other units?
A65: Some development has recently occurred on the Archos FM units, and is
in the daily builds. However the FM development is not being done by
the core team, and so is progressing at a slower rate. As yet,
no development is planned for any of Archos' other units.
Q66: I copied the rockbox MOD/AJZ file to the root, removed the jukebox
safely and rebooted. But Rockbox still didn't load. What is wrong?
I am running Windows.
A66: The old MOD/AJZ was not entirely deleted from the disk. It is still
there, and the boot loader finds that one instead of the new file. Here's
what you can do:
- Download and install Directory Snoop (version 4.03 in November 2002)
from http://www.briggsoft.com/dsnoop.htm
It's shareware, the trial version can be used 25 times.
Directory Snoop can display true drive contents by bypassing the
operating system and reading the raw drive sectors directly.
- Plug the Jukebox in the PC as usual and power on
- Launch Directory snoop
- Click on the Jukebox drive letter in the [select drive] field in the
toolbar. The content of the jukebox hard drive appears in the main
window. Files which appear in red color don't seem to be present on the
hard drive, but they still here.
- Simply select the appropriate files (red color) and purge them
(Purge button). Of course, don't erase the new archos.mod file and the
.rockbox directory :)
- Safely remove (Windows unmount device function) the Jukebox.
Power it up and ...voila... Rockbox is there!
(Thanks to Olivier Rafidison for this info)
Q67: What kind of mic can I connect to my AJBR?
A67: There are several types of microphones.
Dynamic: The one that's available from Archos is a dynamic one.
Their output level is high enough so that they don't need an
amplifier (that's the reason why the Archos mic is of this type -
it's cheap).
- cheap
- no good sound quality of cheap dynamic mics (good enough for
speech)
- no amplifier needed
Backplate Condenser: These are the professional mics. They need phantom
power (48V) for charging the condenser.
They also need an amplifier, because their output level is low.
- good sound quality
- need phantom power (48V)
- need amplifier
- expensive
Electret Condenser: These capsules are cheap and result in a good
recording quality. They don't need phantom power voltage. They need power
for the FET (field effect transistor) that's inside. If you have such a
mic with a battery in it, it is mostly because of the FET power, not
because of an amplification circuit inside the mic. These mics are in
all the consumer products like mobile phones, PC headsets and so on.
- cheap (2 EUR for a capsule)
- good sound quality
- need amplifier
- need power for the FET (1,5 - 15V)
Recommendation for do-it-yourselfers: Use electret condenser mic capsules,
solder an amplifier for them which both amplifies the output level
and feeds the power needed for the FET to the capsule.
The one on http://www.geocities.com/ferocious_1999/md/micpreamp2.html
was soldered and tested by Uwe Freese, and it works.
There are some others available from www.elv.de and other sellers.
Recommendation for others: Buy some mic + preamp combination which can be
plugged into a line in of any amplifier. Maybe such a commercially
available combination needs a power supply and doesn't work with
batteries. Some are very expensive. (If you know a cheap solution with an
electret condenser mic + preamp, please tell us!)
What does not work: Don't use an amplifier thing that is simply connected
between some mic cable. Maybe it sounds as if it could work, but I
doesn't. If the piece of (expensive) electronic doesn't have a power
source and your mic doesn't either, it does not work! A PC sound card or
md player usually has a power output (same pin where the sound goes
through, dc value) for feeding the FET of an electret condenser capsule
(see above) (and this power could also used to feed a mic amplifier), but
the Archos hasn't (it's a line in and no mic in!).
If you want to know more on microphone powering, read this:
http://www.hut.fi/Misc/Electronics/circuits/microphone_powering.html.
(As described, you also need amplification.)
Q68: I can't start rockbox when the charger is connected. What am I doing
wrong?
A68: If your device is off and you connect the charger, the Archos charger code
is started immediately. You can then start Rockbox with holding down the
ON key for several seconds. Hold the key down a really long time, until
you see the Rockbox logo!
Q69: Why can't you implement a cross-fader? That would be so cool!
A69: Please read our NODO faq. http://rockbox.haxx.se/docs/nodo.html#3
Q70: My screen is all black/white when I run Rockbox on my Recorder!
A70: We have no way of knowing the correct contrast setting from start and the
displays differ a lot. Change your contrast setting by doing this:
F1, down, right, down, down, right, down, down, down, right, down (until
you like the contrast)
Q71: Where are the FM controls for the FM Recorder?
A71: In Rockbox 2.0 and earlier, FM support was not yet developed. FM tuner
support is only available using the very latest versions of the Rockbox
builds for the FM Recorder.
Q72: I installed/renamed ajbrec.ajz (or archos.mod) but I am still booting
with another version of firmware.
A72: When looking on the hard disk the Archos firmware only matches the first
ten characters of the file name. Because of this files like
ajbrec.ajz.bak or ajbrec.ajz-20030404 match and are loaded. To
prevent this from happening, give the it a file name that differs in
the first 10 characters, e.g., ajbrec.bak.ajz.
Q73: Help! My recorder crashes when I copy files to it!
A73: Yes, the recorder can crash when you copy several gigabytes of
files to it. The explanation is simple: Copying several gigabytes
of files through USB requires a long period of sustained disk
activity and drains more power than the batteries of the recorder
can store. A long copy will eventually drain the batteries to the
point where the recorder can no longer function and it halts.
This even happens when connected to the charger, since the power
drain is more than the charger can provide! If the recorder halts
while connecter to the charger, the batteries will recover and
after a short while it will reboot the Archos firmware in charger
mode. To make it worse, depending on the USB drivers of your
system it can cause your system to crash as well, or confuse it
to the point it needs a reboot.
There is no solution, just some tips.
* Connect to the charger when copying lots of files. This will
not prevent the problem, but it will take longer to happen.
* Make sure you have "Deep Discharge" disabled.
* Switch off the "Backlight On When Plugged" option.
* 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: What should I know about digital I/O connector on my jukebox?
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. 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.
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.
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.
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, since it's always on. The sound settings on the digital output
are always flat, your volume, bass, treble, bass boost, loudness settings
won't have any effect here, that's why fade in/out won't work,
either. The sampling frequency of the digital output is the same as the
sampling frequency of the mp3. It's therefore possible that your external
equipment won't be able to synchronize to the output of your jukebox if
you have mp3's with sampling frequencies other than 32, 44.1 or 48kHz
(The pitch shift function also modifies the sampling frequency!).
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 some adapter cables exist with different color coding, so if it
doesn't work try to swap red and white. 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 from the Archos) or optical to electrical (for
digital recording in to the Archos).
Q75: How do I unsubscribe from the rockbox mailing list?
A75: The same way you subscribed, but you send an 'unsubscribe' request to the
mailing list server instead of the 'subscribe' one you sent before.
This is all mentioned on the same web page: http://rockbox.haxx.se/mail/
Please please please pretty please with sugar on top, DO NOT attempt to
mail unsubscribe requests to the mailing list itself. That will only
annoy more than 400 readers and will have no effect on your subscription.
In fact, you NEVER unsuscribe to ANY mailing lists by mailing unsubscribe
to the list's address. You might as well take the opportunity to learn
this right away.
When you first subscribed to the mailing list, you were sent a welcome
mail from the server. It contained information about the mailing list and
instructions on how to unsubscribe. It is considered a good habit to keep
such welcome messages from mailing lists.
In addition to all this, every mail that is sent out to the rockbox
mailing list has a set of standard headers that offer info about the
mailing list: how to post, how to unsubscribe, where to find the mailing
list archives etc. Sensible mail clients can display these headers.
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