SACD/DVD-A to Ethernet Project - diyAudio
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Old 7th December 2008, 11:50 PM   #1
bob1029 is offline bob1029  United States
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Default SACD/DVD-A to Ethernet Project

I had a silly idea the other day about using my Denon DVD-757 in combination with a Xilinx Spartan 3an starter kit to send the raw PCM/DSD data over ethernet to a computer.

Well apparently this idea got out of hand and is now semi-successful.

Initially I thought I would have to solder leads to the PQFP chip (the BB DSD1608 part) in order to recieve the PCM and DSD data. Apparently there exists a through-hole copper connector for the following:

_PCM_
PDATA1 (all 4 stereo serial connections)
PDATA2
PDATA3
PDATA4
PBCK (pcm bit clock)
PLRCK (left/right pcm clock)

_DSD_
DSD1-8 (1-bit for each channel)
DBCK (dsd clock)

Ive tested each of these connections in Chipscope Pro and they are all valid depending on what type of disc I'm playing.

Heres a crappy shot of the PCM section with labeled pins:

Click the image to open in full size.

(sorry about the image size)

I plan on connecting all pins for pcm and designing a vhdl module for transmitting the data to the ethernet interface. On the PC side, I will used winpcap in c++ to grab the raw data so I don't have to worry about the headers and latency.

Another gratuitous fun shot:
Click the image to open in full size.

Anyone have an opinions/ideas?
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Old 8th December 2008, 12:16 AM   #2
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Don't know anything about this stuff but it sounds interesting, so good luck.
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Old 8th December 2008, 01:55 AM   #3
bob1029 is offline bob1029  United States
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Success on capture of the pcm data from the player:

Click the image to open in full size.
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Old 8th December 2008, 03:49 AM   #4
bob1029 is offline bob1029  United States
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Looks like I went and nuked my spartan3... Waiting for a replacement board. Should give me time to write a vhdl module for buffering and transmitting data to ethernet.
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Old 8th December 2008, 10:41 AM   #5
rossl is offline rossl  United States
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There are lots of software tools to work with PCM data available. But what can you do with DSD? Are there tools available to work with DSD?

Since a DVD ROM drive won't recognize a SACD, I have never had the chance to edit or manipulate DSD data.
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Old 8th December 2008, 02:48 PM   #6
bob1029 is offline bob1029  United States
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This is true, I don't think many people have had the opportunity to work with DSD yet. I think the simplest way to do this is to use a low-pass (averaging) filter followed by decimation of 64. I am assuming all DSD signals are 44.1khz x 64 = 2.822mhz, but I am probably mistaken. The bit resolution could probably be varied depending on how the filter is implemented.

I found a nice website that goes over alot of the basics:
http://www.beis.de/Elektronik/DeltaS...igmaDelta.html
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