Rockbox Development > New Ports
Rockbox Player - Project to design and build a Free/Open hardware audio player
casainho:
--- Quote from: froggyman on April 21, 2009, 08:18:27 AM ---
--- 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
--- End quote ---
Thanks.
--- Quote from: Alex_Nsk on April 20, 2009, 11:15:15 PM ---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...
--- End quote ---
But right now you are putting your time and money to hack some hardware that is not different from the general other ones. You are hacking a closed source hardware, which I think it limit the acess to people for your work.
Don't you really think that a closed source hardware have more "poor sound potential" than an Open Hardware one which everyone can improve easily??
I would love to have your board schematics and documentation for future reference, who knows if we can reuse it? :-)
Alex_Nsk:
--- Quote from: casainho on April 21, 2009, 08:31:22 AM ---
But right now you are putting your time and money to hack some hardware that is not different from the general other ones. You are hacking a closed source hardware, which I think it limit the acess to people for your work.
Don't you really think that a closed source hardware have more "poor sound potential" than an Open Hardware one which everyone can improve easily??
I would love to have your board schematics and documentation for future reference, who knows if we can reuse it? :-)
--- End quote ---
Above I was talking about Cowon X5, of cause.
I choose this one also because of it's hardware was hacking almost to the end by rockbox guys. So we can call it "OPEN".
Just for $80 I buy a working thing which suits all my needs in hard&soft and is ready for the best audio hardwire modifications.
Thanks for the cowon & rockbox guys!
And you are just in the beginning...to make a thing that is ever equal to the X5 you'll must work really hard and spend more, more time...
Researching of Hardware..sotware..programming, design of the ergonomic and aesthetic body... Making the body at the end!
So why you must to do the same things again and again?
Especially if somebody was making a working platform just like "especially for us" already?
That is a question!
As for audio path schematic...just look at the TPA6120 datasheet and you'll see a complete BEST/SIMPLE modern audio path.
Some changes - I'll use PCM1798 as DAc chip & AD8620 as I/U convertors...There are not any mysteries... ;).
Good PCB layout and best passive components will do the best!
There is Just one problem: 16bit PCM limitation from SCF5250 as I said earlier... ???
casainho:
--- Quote from: Alex_Nsk on April 22, 2009, 11:24:01 PM ---
--- Quote from: casainho on April 21, 2009, 08:31:22 AM ---
But right now you are putting your time and money to hack some hardware that is not different from the general other ones. You are hacking a closed source hardware, which I think it limit the acess to people for your work.
Don't you really think that a closed source hardware have more "poor sound potential" than an Open Hardware one which everyone can improve easily??
I would love to have your board schematics and documentation for future reference, who knows if we can reuse it? :-)
--- End quote ---
Above I was talking about Cowon X5, of cause.
I choose this one also because of it's hardware was hacking almost to the end by rockbox guys. So we can call it "OPEN".
--- End quote ---
No way that hardware is open.
--- Quote from: Alex_Nsk on April 22, 2009, 11:24:01 PM ---And you are just in the beginning...to make a thing that is ever equal to the X5 you'll must work really hard and spend more, more time...
Researching of Hardware..sotware..programming, design of the ergonomic and aesthetic body... Making the body at the end!
--- End quote ---
The same as Rockbox firmware and many others Open Source hardware/firmware projects.
And I am not alone, we are a few developers, and there is one person that want to sell it which will help improving the system.
Alex_Nsk:
--- Quote from: friendlyzookeeper ---
Your selected components are fine for the exception of the power consumption. TPA6120 uses 10v or more, TDA2822 would be a better choice for me. PCM1798 uses 5v analog and 3v3 digital, I like 3v3 not the 5v. AD8620 uses 5v, from the same company an op-amp can use 3v3. I prefer a codec with an op-amp. Your choices are very good ones, since they give schematics, I like that myself.
--- End quote ---
The booster DC/DC converter hardware from 3.7V LiPo to the high current +/-5V IS THE MUST for the trully HIGH END sound.
It is included in my schematic...
casainho:
NEWS about the hardware
We are moving to an Phillips LPC ARM9, which is cheaper than the Atmel AT91SAM ARM9 but also lacks some functionalities. Although this LPC ARM9 should be powerful enough for decoding lossless codecs - I hope (there is no DSP instructions on this LPC as we had on AT91SAM ARM9).
We hope to sell the boards on early June.
Hopefully by July we could have a proper, encased, audio player/recorder.
We are working with another commercial partner and we can't reveal much more info until the board is on selling. Schematic and board will be Open Hardware, and designed with Free Software tool KiCAD.
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