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Computer Audio Asylum Music servers and other computer based digital audio technologies. |
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Computer Audio Asylum Music servers and other computer based digital audio technologies. |
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In Reply to: Tony's Player posted by John Swenson on July 13, 2012 at 00:15:47:
John,
Only kidding, but it would be easier and less work just to put a damn dac on an iPad than it would be to develop an entire product.
If you wanted DSD and PCM then XMOS would be the best bet. You may want to use the dual core to do this with one core used for USB the other for memory. Or use something silly like SPI memory which would take up less space and then you could probably do the whole thing with a single core.
It would be tons easier to do this USB than Ethernet as the XMOS does require 2 cores for Ethernet audio.
Since there is already an SPI port for booting the XMOS you could easily use that port for memory storage as well.
Micron has some 128M SPI ram parts, create a select line for a bunch and be done with it. They are only SOIC-16 so they are pretty small. Maybe like 32 of them with a plug in board for 32 more.
I could have this done this afternoon anyone interested :)))
--- But really if you optically isolate the computer from the dac section and have significant and intelligent buffering then it really would not be required for all this.
I think even having the XMOS on the same plane as the DAC chip is a bad thing. Heck it has a ton of PLL's to reclock the part and all the IO so this is not the cleanest part on the block. But which one would be... well none of them.
Really to do this with the XMOS you would be best to have a dual power supply and run the XMOS off one then optically isolate to the digital audio section powered by a separate transformer.
You maybe could pull this off easier with an FPGA and a bunch of memory. You could put a SD card interface on the unit. Plug in the card, the FPGA would transfer the SD info to RAM then set a LED to green and start playing.
Oh great now I got more stuff in my head!
Thanks
Gordon
J. Gordon Rankin
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Follow Ups
- John, I think it's called an iPod :) - Gordon Rankin 07:09:00 07/16/12 (6)
- RE: John, I think it's called an iPod :) - John Swenson 14:54:19 07/16/12 (4)
- RE: John, I think it's called an iPod :) - Gordon Rankin 09:47:13 07/17/12 (3)
- The Gods are talking - jrling 04:00:49 07/19/12 (2)
- RE: The Gods are talking - SBGK 04:33:38 07/19/12 (1)
- you just proved that the discussion is valid - bwb 06:51:45 07/19/12 (0)
- John, I think it's called PlayGo - Roseval 12:55:01 07/16/12 (0)
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