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Old 5th January 2006, 01:36 PM   #1
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Default High resolution (sa)cd output

I was thinking;
Does anyone have any experience in modding a sacd-player so that it would have a high res. digital output.
I know Oehlrich has done a terrific job on a pioneer 575a but it only does 88.2khz. I would like a 176.4khz output.

So I have the follwoing suggestion;
Take a sony xe-670 which has dsd1702 dac. Now take a pcm4204 (or maybe sm5819) and convert dsd to pcm and then to aes/spdif.
The dsd1702 and pcm 4204 are both from TI's Burr Brown so maybe they have the same dsd input-format?
Anyone any experience with this? Anyone interested in doing so?
Maybe someone (in the Netherlands) would like to help or try with me?
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Old 9th January 2006, 10:41 AM   #2
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again, nobody?
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Old 9th January 2006, 03:41 PM   #3
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The PCM4204 will only convert DSD to the base rate which is 44K1.
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Old 9th January 2006, 05:59 PM   #4
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I have read the pcm's PDF again and I now know this
DSD input is 64fS (64x44.1=2,8224Mhz which is the SACD freq. This is also the DSD freq that the dsd1702 accepts, must be correct ) This is called dualrate. And according to page 16 of the pdf; the dual rate mode is utilized for sampling frequencies higher than 54kHz and up to 108kHz. So max will be 88,2kHz stereo
Conclusion; it is better to use oehlrich's pioneer-output
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Old 9th January 2006, 06:33 PM   #5
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Oehlrich's board assumes you have internal DSD to PCM conversion and you will not get 88k2 out of the PCM4204. You would be better served by the NPC SM5816AF.
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Old 10th January 2006, 06:56 AM   #6
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according to;
http://www.npcamerica.com/Datasheets/SM5816.pdf

page 3 suggests that one can convert dsd to pcm with 8fs 24/32bit
8fs=8x44.1khz=352.8khz

hmm can this be something?

Thanks rfbrw, I will look into it. Anyone else any suggestions?
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Old 10th January 2006, 10:13 AM   #7
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All you have to do now is get the chip.
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Old 10th January 2006, 11:40 AM   #8
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this can be difficult I suppose?
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Old 10th January 2006, 02:49 PM   #9
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Originally posted by aaronboumans
this can be difficult I suppose?
It has been that way in the past but you could give these guys a bell. http://www.kagaeuro.com/npc.html
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Old 12th January 2006, 01:16 AM   #10
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fascinating chip, that NPC. i wonder how the decimation filters sound. i suppose if you had the know-how you could feed it your own coefficients.

if i were able to build my dream all-digital stereo system, i would use that chip so i could perform DSP on DSD. i guess you will never see a commercial product with high-res PCM out on SACD tho, due to copyright restrictions. i hate sony.
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