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Old 17th May 2011, 07:56 AM   #1
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Default DIY S/PDIF to 6-channel analog

I'm trying to design and build a board that will convert S/PDIF to 6-channel analog. The actual application is an adapter for an original XBOX AV cable to VGA and 5.1 analog for a monitor and computer speakers.

I know they make Dolby Digital decoder ICs (AKM Semiconductor, Inc.: Digital Audio - S/PDIF - AK4113) that I can buy, and I know they make 6 channel DAC ICs. I'm a little fuzzy on how I would need to setup the whole circuit.

I need to process the Dolby signal first (I think), which will spit out a decoded digital stream that a DAC can process into a 6-channel analog out. Which can be wired up to 3 stereo 3.5mm plugs.

Anyone have any suggestions or tips on the correct procedure for something like this?
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Old 17th May 2011, 08:17 PM   #2
qusp is offline qusp  Australia
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hehehe, sorry mate this is a tall order. just buying the ic will not mean you can decode the 5.1 audio. i'm going to make an assumption here, sorry if i'm off base. you are far too vague on details for someone who is going to be able to do this. just putting a reply in a post here in itself would be impossible, this is a bigger project than you realize. if even possible as a straight diy project without buying dolby licenses (doubtful) its one of those things that will cost far more to design and build than buy ready made.

Last edited by qusp; 17th May 2011 at 08:36 PM.
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Old 18th May 2011, 05:32 AM   #3
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truth is, i'm more of a software guy and I'm not always clear on the hardware aspect. If you actually read the data sheet for that IC it does decode Dolby Digital.

Either way, how would you take a 5.1 S/PDIF signal and convert it to 6 analog signals that could be output to a set of computer speakers?
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Old 18th May 2011, 08:31 PM   #4
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yes of course, there are many that list this as a spec, there are many that also list dsd decoding, but to get it working requires more than just the hardware being able to do it. sounds like you are actually talking about hdmi when you are talking about 5.1 spdif as well, which is yet another one that requires a license. i would say google is your friend tbh, if there is 5.1 spdif unlocked/exposed on the xbox, not only would microsloth be in big trouble with the copyright lawyers, but there would be quite a bit of noise and probably a tutorial on the net.
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Old 18th May 2011, 09:29 PM   #5
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eBay decoders
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Old 23rd May 2011, 10:21 AM   #6
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Quote:
Originally Posted by SoNic_real_one View Post
The designer of this decoder is the same person of Gigawork DAC.

Last edited by jeffery8341; 23rd May 2011 at 10:24 AM.
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Old 26th May 2011, 08:19 PM   #7
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Quote:
Originally Posted by toadzky View Post
truth is, i'm more of a software guy and I'm not always clear on the hardware aspect. If you actually read the data sheet for that IC it does decode Dolby Digital.

Either way, how would you take a 5.1 S/PDIF signal and convert it to 6 analog signals that could be output to a set of computer speakers?
Actually, it does not decode Dolby Digital. It simply detects that the incoming bitsteam is Dolby Digital and sets a GPIO flag which can be used to engage a decoder on the output data stream.
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Old 28th May 2011, 05:28 AM   #8
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Originally Posted by jeffery8341 View Post
The designer of this decoder is the same person of...
He does neat jobs, I am following his products on eBay for a while now. I just didn't need another DAC yet.
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