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Old 27th March 2009, 12:22 PM   #21
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SD-card player prototype is working, there are some minor problems with SD-card latency, this will be solved by doubling RAM buffer size.

SD-card access is software-driven, I2S signals are generated by the on-chip DCI module and through DMA.

The player already supports multiple directories (99) and multiple tracks within each directory (99 track / directory). Long file names can be used as well.

Shuffle play (CD / tracks) also works.

Bit clock jitter can be kept very low as expected. First impressions of sound quality are very good.

The SD-card latency limits max. sample rate and bit depth. The latency is basically caused by the on-card controller, and may vary with SD-card brand.
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Old 27th March 2009, 02:50 PM   #22
glt is offline glt  United States
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Very nice. Any photos?
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Old 27th March 2009, 03:15 PM   #23
Onnosr is offline Onnosr  Netherlands
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Quote:
Originally posted by glt
Very nice. Any photos?

John

Congrats to you (and brothrer!)

Onno
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Old 27th March 2009, 06:46 PM   #24
EUVL is offline EUVL  Europe
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How about user interface (display, remote, ....) ?
And when would you be offering to us ?

I have a serious interest in the frontend part, up to I2S output.
There are just too many limitations in the Koonlab version.

Pls keep us posted.


Patrick
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Old 27th March 2009, 11:33 PM   #25
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Just came across this...

http://www.compactstick.com/

it seems the only stuff being released in this format at the moment is psychedelic trance, however it will be interesting to see if this becomes more widely adopted.

There is specification for the filesystem layout here:

http://www.compactstick.com/cs_contents_v10.pdf

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Old 28th March 2009, 12:40 AM   #26
UV101 is offline UV101  England
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Could a Squeexebox be used to output I2S?

If so, it will handle FLAC no problem?

Whilst the media os not solid state, has no mechanical and servo parts which I think is the point of this thread??

Ian
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Old 28th March 2009, 01:22 AM   #27
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ecdesigns, are you planning an electronic control (user) interface of some kind? This would make it a very useful module for other projects.

There are a ton of cheap transflash and sd players (also mp4 video) from china around for between $20 - $35. Do you think any of these would be hackable for i2s or some kind of digital output?
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Old 28th March 2009, 04:01 AM   #28
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Default regarding hardware design

ecdesigns,
It would be very useful to buffer both the clock signals
going to the dac and dsp, as changes in the impedances
or pll pulling (if that happens in the internal circuitry)
will cause some jitter. It will be a pity to loose the
clean clock to this.
Also, make sure all impedances are matched as far as
you can from chip pin to external circuitry.

Looking forward to the final thing!
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Old 28th March 2009, 10:09 AM   #29
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Hi git,

The prototype is built around a Microchip DV164027 MPLAB debugger module:

http://nl.farnell.com/microchip/dv16...questid=734245

We added a SD-card holder, an external 2.8224 MHz low jitter clock, and a stereo DAC for testing.

The microcontroller is a DSPIC33FJ128GP802.

I try to make and post some photographs of the test set-up soon.
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Old 28th March 2009, 10:17 AM   #30
EUVL is offline EUVL  Europe
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John,

I hope you would offer a dedicated board before long.

I like your designs, not only this one but also your TDA154x DACs, especially the linear interpolation. Innovative stuff, as one often finds in designs coming from the Netherlands.




Patrick
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