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Old 27th October 2003, 09:07 AM   #1
MWP is offline MWP  Australia
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Join Date: Oct 2002
Location: Adelaide, South Australia
Default 4x SPDIF out soundcard conversion?

Hi all,

Ive been trying to work out a nice cheap way of getting multiple SPDIF channels out of a PC which ill use for room EQ and xovers (BruteFIR).

Has anyone thought about modifiying a soundcard so that the I2S signals could be intercepted before the cards DAC?
On this card these could then be converted into separate SPDIF out lines.

Ive been looking at the design of the Terratec Aureon cards that use the Envy24HT and the Wolfson WM8770 DAC.

The Wolfson takes the inputs:
MCLK, BCLK, DACLRC, DIN1, DIN2, DIN3, DIN4.

AFAIK these are just regular I2S signals, but with obviously more data in lines to support the 8 channels.

Ive also got the full (!!) Envy24HT datasheet here, but its a little skimp on the timing details.

Would it really be as simple as getting the data from these lines and feeding them into 4 I2S->SPDIF converter ICs?

So, can anyone see anything wrong with what im thinking of here?
If not, ill buy the card and see what i can do.
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Old 27th October 2003, 03:49 PM   #2
magnus is offline magnus  Sweden
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Join Date: Feb 2003
Location: Gothenburg
Default Nice

This is a nice way:

Hammerfall

295.00

I think that's pretty cheap.

/Magnus

Great minds think alike.
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Old 27th October 2003, 07:54 PM   #3
Henckel is offline Henckel  Denmark
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Join Date: Sep 2002
Location: Copenhagen, Denmark
Hello

I belive that the attached link can help you;


http://www.electricstart.de/

select electronics -> 6 digital in/out ..


This looks so cheap that it might be worth trying out

Morten
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Old 27th October 2003, 08:56 PM   #4
ojg is offline ojg
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Join Date: May 2003
Location: Norway
Default Re: 4x SPDIF out soundcard conversion?

Quote:
Originally posted by MWP
Has anyone thought about modifiying a soundcard so that the I2S signals could be intercepted before the cards DAC?
On this card these could then be converted into separate SPDIF out lines.

<snip>

Would it really be as simple as getting the data from these lines and feeding them into 4 I2S->SPDIF converter ICs?
Been there, done that...

Yes it is that simple especially with a Envy24 based card. I have the M-Audio Audiophile 2496 and I tapped into the I2S signals going to the CS8427 and connected them to a separate DAC. Essencially I did the opposite of what you are trying.

It should work fine, good luck!
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Old 28th October 2003, 03:00 AM   #5
MWP is offline MWP  Australia
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Join Date: Oct 2002
Location: Adelaide, South Australia
Default Re: Re: 4x SPDIF out soundcard conversion?

Quote:
Originally posted by ojg

Yes it is that simple especially with a Envy24 based card. I have the M-Audio Audiophile 2496 and I tapped into the I2S signals going to the CS8427 and connected them to a separate DAC. Essencially I did the opposite of what you are trying.
It should work fine, good luck!
Great... thanks for that, ill pick up a Aureon shortly then.
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Old 4th February 2004, 12:48 AM   #6
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Location: Vancouver, BC
ojg, would you care to elaborate as to how you implemented the I2S output?
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