Rockbox Development > New Ports
Rockbox Player - Project to design and build a Free/Open hardware audio player
Alex_Nsk:
Hi, Guys! Your project looks great... My congratulations!
But, if you work to make' em best - you must use best audio hardware at fist!!!!!!!!!
I look at short at the project and see that you plan to use TI TLV320 codec. I think that it is a waste of money and time! If doing so why just don't buying used Cowon X5/M5 - that dap USE SAME CHIP, looks great, price is as low as it can?
By the way - it sounds cheap!
Right now I'm working at the X5 Xmod project: I m use a half of X5 hardware, rockbox software and almost rebuilt all sound path!
Audio path hardware would be:
IIS from CF5250 (I'm appreciate any help with rebuild in rockbox with up to 24bit word IIS) > PCM1708 > AD8620 i/u converters in balanced configuration (4mA inputs into 2V outs) > TPA6120 (2v inputs to the +/-4V outputs with max current capacity up to 300mA whit a slew rates up to 900V/uS!!!)
All digital-to-sound chips supplied with +/-5V voltage from high efficiency DC/DC converters fed from a single Li-Po 3.3V cell. Low-ESR Sanyo Os-COn caps, ferrite beads for filtering and so on..
I think that novaday such signal path is THE BEST/SIMPLE EVER!
Right now I'm working at the printed circuit board layout, to suit best available quality and physical X5 compartment.
I think it could to be a sound killer DAP!
P.S. I'm plan to use a software volume control that present in DSP module of rockbox (precut item in EQ) So if one want to have a best quality sound he should to share IIS word length up to 24bits. Doing so all products of rounding in the out of the DSP modules must to lay below 16bit limit.
casainho:
--- Quote from: Alex_Nsk on April 19, 2009, 11:21:21 PM ---Hi, Guys! Your project looks great... My congratulations!
--- End quote ---
Thank you ;-)
--- Quote from: Alex_Nsk on April 19, 2009, 11:21:21 PM ---But, if you work to make' em best - you must use best audio hardware at fist!!!!!!!!!
--- End quote ---
We would like to have the best of all, but we don't have all the knowledge nor possibilities... for now we are trying to have a working base hardware, on next iteration we can add better audio, but while then we should do as you are doing, small add on boards for developers test new features for finally add them on next iteration of hardware.
--- Quote from: Alex_Nsk on April 19, 2009, 11:21:21 PM ---I look at short at the project and see that you plan to use TI TLV320 codec. I think that it is a waste of money and time! If doing so why just don't buying used Cowon X5/M5 - that dap USE SAME CHIP, looks great, price is as low as it can?
By the way - it sounds cheap!
Right now I'm working at the X5 Xmod project: I m use a half of X5 hardware, rockbox software and almost rebuilt all sound path!
Audio path hardware would be:
IIS from CF5250 (I'm appreciate any help with rebuild in rockbox with up to 24bit word IIS) > PCM1708 > AD8620 i/u converters in balanced configuration (4mA inputs into 2V outs) > TPA6120 (2v inputs to the +/-4V outputs with max current capacity up to 300mA whit a slew rates up to 900V/uS!!!)
All digital-to-sound chips supplied with +/-5V voltage from high efficiency DC/DC converters fed from a single Li-Po 3.3V cell. Low-ESR Sanyo Os-COn caps, ferrite beads for filtering and so on..
I think that novaday such signal path is THE BEST/SIMPLE EVER!
Right now I'm working at the printed circuit board layout, to suit best available quality and physical X5 compartment.
I think it could to be a sound killer DAP!
--- End quote ---
Sounds nice your project... can you send the link so we can read more about it?
Right now we are working with a AVROpendous so he will design, make, assembly and sell online (on Ebay) the hardware. We don't have all the info updated online... there is time missing.
Don't you want to join us? we need all the knowledge and developers as possible...
And later we can work on Rockbox audio drivers for having the 24 bits PCM ;-)
Alex_Nsk:
--- Quote from: casainho on April 20, 2009, 05:18:11 AM ---
Sounds nice your project... can you send the link so we can read more about it?
Right now we are working with a AVROpendous so he will design, make, assembly and sell online (on Ebay) the hardware. We don't have all the info updated online... there is time missing.
Don't you want to join us? we need all the knowledge and developers as possible...
And later we can work on Rockbox audio drivers for having the 24 bits PCM ;-)
--- End quote ---
I' m from Russia, just haven't much possibilities for cooperation.. :-\
Just some thoughts:
At first - you must to decide for what and for whom is your project?
Make just another ugly MP3 player with decent sound at the price of all-in-one china SoC MP4 player - isn't a silly thing?
Second, I just HATE compressed sound! That is because I'll go with rockboxed device... Right now in my remodded X5 presents over 80 CD Images in lossless nor one in lossy!
So, I'm not interested in MP3 player in a way you go. I don't want to waste a time and money in a thing with guaranteed poor sound potential without any simple way for growing...
Instead , I had searching the most "potential in sound" DAP available at the market and that is X5, i think...
Then I though: what I could remode to reach the best sound available from the portable device? As usual a weakest thing is a sound path ! :(
So right now I'm working on it. Overall technical aspects I wrote already in the post above.
When it will be completed, I could offer some more information, or may be printed circuit boards, or assembly kits, or something else for people who want to reach the best with their X5...
Possibly my construction could be used as outer DAC/Headphone AMP for almost any DAP based on the processor AND outer codec chips (could to be connected except original codec via I2S bus)...that is just a thougths right now...
Unfortunately I'm not a programmer, and just cant share 16bit limits in rockbox...if you could help, i'll thank you!
That is not a "death theme" - just another sound degrading factor on a way to the high fidelity :)
Let's go BEST!
casainho:
--- Quote from: Alex_Nsk on April 20, 2009, 11:15:15 PM ---I' m from Russia, just haven't much possibilities for cooperation.. :-\
--- End quote ---
We are all from various countries, for example, I am from Portugal.
--- Quote from: Alex_Nsk on April 20, 2009, 11:15:15 PM ---Just some thoughts:
At first - you must to decide for what and for whom is your project?
Make just another ugly MP3 player with decent sound at the price of all-in-one china SoC MP4 player - isn't a silly thing?
--- End quote ---
Why not? we need also a cheap price as possible, but, with also good quality of sound. Did you read our objectives on project page? "Make a good quality hardware audio player and recorder;".
One advantage over that China SoC MP4 players is having Open Hardware.
--- Quote from: Alex_Nsk on April 20, 2009, 11:15:15 PM ---Second, I just HATE compressed sound! That is because I'll go with rockboxed device...
--- End quote ---
That's the advantage of Rockbox firmware, Open Lossless codecs. That's why just seems ok to go with Rockbox firmware.
--- Quote from: Alex_Nsk on April 20, 2009, 11:15:15 PM --- Right now in my remodded X5 presents over 80 CD Images in lossless nor one in lossy!
So, I'm not interested in MP3 player in a way you go. I don't want to waste a time and money in a thing with guaranteed poor sound potential without any simple way for growing...
Instead , I had searching the most "potential in sound" DAP available at the market and that is X5, i think...
--- End quote ---
What is that X5? is that Open Hardware?
--- Quote from: Alex_Nsk on April 20, 2009, 11:15:15 PM ---Then I though: what I could remode to reach the best sound available from the portable device? As usual a weakest thing is a sound path ! :(
So right now I'm working on it. Overall technical aspects I wrote already in the post above.
When it will be completed, I could offer some more information, or may be printed circuit boards, or assembly kits, or something else for people who want to reach the best with their X5...
Possibly my construction could be used as outer DAC/Headphone AMP for almost any DAP based on the processor AND outer codec chips (could to be connected except original codec via I2S bus)...that is just a thougths right now...
--- End quote ---
Looks like we have the same objectives :-)
--- Quote from: Alex_Nsk on April 20, 2009, 11:15:15 PM ---Unfortunately I'm not a programmer, and just cant share 16bit limits in rockbox...if you could help, i'll thank you!
--- End quote ---
Don't worry, a team is composed of various people with different knowledges :-)
If we "give" people a good hardware base, then then will be motivated to work on 24bits audio PCM drivers for Rockbox.
froggyman:
--- Quote from: casainho on April 21, 2009, 06:12:08 AM ---
What is that X5? is that Open Hardware?
--- End quote ---
I think he is refering to Cowon's iAudio X5: http://www.dapreview.net/p/content/content.php?content.201
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